Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | |||
|
techtalk:ih:carb01q [2023/12/29 19:33] hippysmack |
techtalk:ih:carb01q [2023/12/29 21:16] (current) hippysmack |
||
|---|---|---|---|
| Line 47: | Line 47: | ||
| * An overnight soak in a solution of Pinesol and water followed up with a good brush down with a toothbrush then rinse and air dry. ((http://www.hotrodders.com/forum/pinesol-really-does-clean-carburetors-amazingly-pics-inside-248810.html)) \\ See also [[techtalk:ref:tools127#general_cleaning_and_stuck_gaskets|Soaking parts]] in the REF section of the Sportsterpedia. | * An overnight soak in a solution of Pinesol and water followed up with a good brush down with a toothbrush then rinse and air dry. ((http://www.hotrodders.com/forum/pinesol-really-does-clean-carburetors-amazingly-pics-inside-248810.html)) \\ See also [[techtalk:ref:tools127#general_cleaning_and_stuck_gaskets|Soaking parts]] in the REF section of the Sportsterpedia. | ||
| * A 20 minute to up to a few days soak in a gallon of Gunk (or other) Carburetor Cleaner that has a basket inside for small parts and lowers in the can with a handle, rinse, air dry, use. | * A 20 minute to up to a few days soak in a gallon of Gunk (or other) Carburetor Cleaner that has a basket inside for small parts and lowers in the can with a handle, rinse, air dry, use. | ||
| - | * Soak it in mineral spirits for a few days. ((Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=185361)) | + | * Soak it in mineral spirits for a few days. ((Monte03 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/47937-cleaning-a-carb?t=185361)) |
| - | * You can use acrylic paint thinners for cleaning up carb parts. It melts the fuel varnish right off. ((russzx6 of the XLFORUM http://xlforum.net/forums/showthread.php?t=185361)) | + | * You can use acrylic paint thinners for cleaning up carb parts. It melts the fuel varnish right off. ((russzx6 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/47937-cleaning-a-carb?t=185361)) |
| * An aerosol spray carb cleaner will also work but may not loosen all of the build up in the jets or orifices in the carb body if they're not directly sprayed through. | * An aerosol spray carb cleaner will also work but may not loosen all of the build up in the jets or orifices in the carb body if they're not directly sprayed through. | ||
| * Blow out all holes, jets and orifices thoroughly with compressed air after cleaning. \\ Reverse air flow through each passage to ensure removal of all dirt particles. | * Blow out all holes, jets and orifices thoroughly with compressed air after cleaning. \\ Reverse air flow through each passage to ensure removal of all dirt particles. | ||
| - | * Blow out the accelerator pump check valves (1 inside the accelerator pump nozzle and 1 inside the accelerator pump housing). \\ You can shake the fuel bowl when it is off the carb. The nozzle check valve and / or check ball should rattle in the bowl housing. \\ If you cant hear it, it's stuck and the accelerator pump will not work. ((81Fe of the XLFORUM http://xlforum.net/forums/showthread.php?t=1663198&page=7)) | + | * Blow out the accelerator pump check valves (1 inside the accelerator pump nozzle and 1 inside the accelerator pump housing). \\ You can shake the fuel bowl when it is off the carb. The nozzle check valve and / or check ball should rattle in the bowl housing. \\ If you cant hear it, it's stuck and the accelerator pump will not work. ((81Fe of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/155008-weird-keihin-carb-problem/page7?t=1663198&page=7)) |
| * The nozzle check valve is inside the brass spray nozzle. It should be reverse blown due to the nature of it's function. \\ Blowing from the pump nozzle will just shut down flow when the valve closes on it's seat. \\ It is weighted and looks very similar to the float valve except the tapered end is metal. \\ It should move up off it's seat and then lower back down on the seat. | * The nozzle check valve is inside the brass spray nozzle. It should be reverse blown due to the nature of it's function. \\ Blowing from the pump nozzle will just shut down flow when the valve closes on it's seat. \\ It is weighted and looks very similar to the float valve except the tapered end is metal. \\ It should move up off it's seat and then lower back down on the seat. | ||
| * The check ball is either inside a passage cast into the carb bowl (from the bowl to the pump) or in the pump housing itself. \\ When this passage gets gummed up, the check ball usually gets stuck closed, hence why the pump does not work. \\ The check ball is rarely considered when rebuilding a carb. \\ It's also very hard to clean. The only way is to blast the passage with carb cleaner and compressed air over and over until it works. \\ Sometimes soaking alone does nothing for freeing up the check ball without blasting it with carb cleaner and air or brake cleaner. | * The check ball is either inside a passage cast into the carb bowl (from the bowl to the pump) or in the pump housing itself. \\ When this passage gets gummed up, the check ball usually gets stuck closed, hence why the pump does not work. \\ The check ball is rarely considered when rebuilding a carb. \\ It's also very hard to clean. The only way is to blast the passage with carb cleaner and compressed air over and over until it works. \\ Sometimes soaking alone does nothing for freeing up the check ball without blasting it with carb cleaner and air or brake cleaner. | ||
| - | |||
| - | |||
| - | |||
| * The FSM says to not use wires or drills to clean small holes as this could cause burrs or change the hole sizes. \\ However, done carefully (and only if needed) with smaller wire than the intended hole to clean, this has been an affective way of removing caked varnish. \\ Use at your own risk. | * The FSM says to not use wires or drills to clean small holes as this could cause burrs or change the hole sizes. \\ However, done carefully (and only if needed) with smaller wire than the intended hole to clean, this has been an affective way of removing caked varnish. \\ Use at your own risk. | ||
| Line 65: | Line 62: | ||
| Make sure to remove any rubber or plastic parts before soaking. Also check the label for safety precautions. \\ | Make sure to remove any rubber or plastic parts before soaking. Also check the label for safety precautions. \\ | ||
| Parts that have been sitting for years may have to be soaked for about 24 hours or even days. \\ | Parts that have been sitting for years may have to be soaked for about 24 hours or even days. \\ | ||
| - | | Carburetor Cleaner ((photo by Hippysmack)) || | + | | Carburetor Cleaner ((photos by Hippysmack)) || |
| |{{techtalk:ref:genmsr:parts_cleaner_1_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:genmsr:parts_cleaner_2_by_hippysmack.jpg?direct&300|}}| | |{{techtalk:ref:genmsr:parts_cleaner_1_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:genmsr:parts_cleaner_2_by_hippysmack.jpg?direct&300|}}| | ||
| Line 77: | Line 74: | ||
| This setup works better than putting the carb (pre-CV) directly into the vice. \\ | This setup works better than putting the carb (pre-CV) directly into the vice. \\ | ||
| The carb is set upright as 'in use' making adjustments more straight forward. \\ | The carb is set upright as 'in use' making adjustments more straight forward. \\ | ||
| - | {{:techtalk:ref:tools:carb_stand_1_by_ironmick.jpg?direct&150|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=185361)) {{:techtalk:ref:tools:carb_stand_2_by_ironmick.jpg?direct&150|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=185361)) \\ | + | {{:techtalk:ref:tools:carb_stand_1_by_ironmick.jpg?direct&150|}} ((photo by IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/47937-cleaning-a-carb?t=185361)) {{:techtalk:ref:tools:carb_stand_2_by_ironmick.jpg?direct&150|}} ((photo by IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/47937-cleaning-a-carb?t=185361)) \\ |
| ====== Rebuild Kit ====== | ====== Rebuild Kit ====== | ||
| Line 96: | Line 93: | ||
| * Some Misc Parts/Seals | * Some Misc Parts/Seals | ||
| - | If you get a kit, do not discard any of your original parts especially the needle valve. The ones in the kits have a very bad reputation. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?p=4457592&highlight=keihin+bowl#post4457592)) \\ | + | If you get a kit, do not discard any of your original parts especially the needle valve. The ones in the kits have a very bad reputation. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/152553-keihin-carb?highlight=keihin+bowl#post3246682)) \\ |
| Assembling the carburetor is basically the reverse order of disassembly with the exception of setting the float level. See below. \\ | Assembling the carburetor is basically the reverse order of disassembly with the exception of setting the float level. See below. \\ | ||
| Float Valve: \\ | Float Valve: \\ | ||
| - | The 3-sided valve (left below) 'may' sit cock-eyed in the seat sometimes and cause a leak. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=2)) The four sided (right below) valve is 'supposed' to be an improved design. \\ | + | The 3-sided valve (left below) 'may' sit cock-eyed in the seat sometimes and cause a leak. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page2?t=1760294&page=2)) The four sided (right below) valve is 'supposed' to be an improved design. \\ |
| Also check new float valves for manufacturing errors. The glue holding the rubber on has been known to have spilled onto the rubber causing a bad seat. \\ | Also check new float valves for manufacturing errors. The glue holding the rubber on has been known to have spilled onto the rubber causing a bad seat. \\ | ||
| - | {{:techtalk:ih:carb:float_needles_by_county_fair_-_cropped.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=2)) {{:techtalk:ih:carb:glue_on_inlet_needle_by_flthd31.jpeg?direct&300|}} ((photo by flthd31 of the XLFORUM http://xlforum.net/forums/showthread.php?p=5846205#post5846205)) \\ | + | {{:techtalk:ih:carb:float_needles_by_county_fair_-_cropped.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page2?t=1760294&page=2)) {{:techtalk:ih:carb:glue_on_inlet_needle_by_flthd31.jpeg?direct&300|}} ((photo by flthd31 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200618-1980-xlh-carb-problem#post4433113)) \\ |
| - | + | ||
| - | The float needle should just kiss the seat with no extra pressure. Aftermarket float valves have a spring loaded pin under the float tab. So when the valve tip closes onto the seat, you can still push the valve down further. The valve should 'just' close when measuring the float level. Pushing further in from there will not close the valve any further. But it will cause you to set the float level wrong. The valve should be a light seat when measuring. Some aftermarket float needles with the spring loaded pin also have a defective neoprene tip on the other end (which does not seal even when set right). ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=1526333&highlight=float+level&page=4)) Since the tip on the needle on aftermarket ones don't work well, some would use the old original one (solid pin) to get a better measurement. ((Smerch of the XLFORUM http://xlforum.net/forums/showthread.php?t=1526333&highlight=float+level&page=4)) Beats assembling the carb only to have it sit there and flood with gas. Also make sure you have the float valve for the correct type of Keihin carb. The aftermarket valves are a little taller. \\ | + | |
| - | {{:techtalk:ih:carb:float_valve_by_megadeth_-_labeled.jpg?direct&300|}} ((photo by Megadeth of the XLFORUM, labeled by Hippysmack http://xlforum.net/forums/showthread.php?t=1526333&highlight=float+level&page=3)) {{:techtalk:evo:carb:keihin_float_valve_comparison_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | + | |
| + | The float needle should just kiss the seat with no extra pressure. Aftermarket float valves have a spring loaded pin under the float tab. So when the valve tip closes onto the seat, you can still push the valve down further. The valve should 'just' close when measuring the float level. Pushing further in from there will not close the valve any further. But it will cause you to set the float level wrong. The valve should be a light seat when measuring. Some aftermarket float needles with the spring loaded pin also have a defective neoprene tip on the other end (which does not seal even when set right). ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140763-kiehin-buttetfly-tune/page4?t=1526333&highlight=float+level&page=4)) Since the tip on the needle on aftermarket ones don't work well, some would use the old original one (solid pin) to get a better measurement. ((Smerch of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140763-kiehin-buttetfly-tune/page4?t=1526333&highlight=float+level&page=4)) Beats assembling the carb only to have it sit there and flood with gas. Also make sure you have the float valve for the correct type of Keihin carb. The aftermarket valves are a little taller. \\ | ||
| + | {{:techtalk:ih:carb:float_valve_by_megadeth_-_labeled.jpg?direct&300|}} ((photo by Megadeth of the XLFORUM, labeled by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140763-kiehin-buttetfly-tune/page3?t=1526333&highlight=float+level&page=3)) {{:techtalk:evo:carb:keihin_float_valve_comparison_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | ||
| Bowl Gasket: \\ | Bowl Gasket: \\ | ||
| {{:techtalk:ih:carb:keihin_butterfly_carb_float_bowl_gaskets.jpg?direct&400Keihin Butterfly Carb Float Bowl Gaskets|}} | {{:techtalk:ih:carb:keihin_butterfly_carb_float_bowl_gaskets.jpg?direct&400Keihin Butterfly Carb Float Bowl Gaskets|}} | ||
| + | |||
| ===== Float Level Adjustment. ===== | ===== Float Level Adjustment. ===== | ||
| Line 140: | Line 137: | ||
| The actual adjustments are made by carefully bending the two tabs of the metal clip on the float assembly until these two dimensions are achieved. \\ | The actual adjustments are made by carefully bending the two tabs of the metal clip on the float assembly until these two dimensions are achieved. \\ | ||
| - | |Setting 'fully closed' position. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Setting 'fully open' position. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))| | + | |Setting 'fully closed' position. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Setting 'fully open' position. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))| |
| |{{:techtalk:ih:carb:keihin_butterfly_carb_18_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_19_by_hopper.jpg?direct&300|}}| | |{{:techtalk:ih:carb:keihin_butterfly_carb_18_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_19_by_hopper.jpg?direct&300|}}| | ||
| Line 148: | Line 145: | ||
| The valve should be fully closed with a measurement of .63"-.67" (16mm-17mm) from the top of the float to the bowl mounting surface. ((1979-1985 HD Sportster FSM pg 4-8)) \\ | The valve should be fully closed with a measurement of .63"-.67" (16mm-17mm) from the top of the float to the bowl mounting surface. ((1979-1985 HD Sportster FSM pg 4-8)) \\ | ||
| - | {{:techtalk:ih:carb:keihin_7_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=3)) | + | {{:techtalk:ih:carb:keihin_7_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?t=1760294&page=3)) |
| ====== Servicing the Carb ====== | ====== Servicing the Carb ====== | ||
| See also [[techtalk:ref:carb07|Keihin Carb Upgrades - Butterfly and CV Types]] in the REF section of the Sportsterpedia. \\ | See also [[techtalk:ref:carb07|Keihin Carb Upgrades - Butterfly and CV Types]] in the REF section of the Sportsterpedia. \\ | ||
| ===== Carb body and float bowl ===== | ===== Carb body and float bowl ===== | ||
| - | |||
| Check the mounting flanges / mating surfaces for war-page. Set the flange on a flat surface such as a plate of glass or window. ((Joe Minton Article "Tuning HD's Keihin Carburetors)) \\ | Check the mounting flanges / mating surfaces for war-page. Set the flange on a flat surface such as a plate of glass or window. ((Joe Minton Article "Tuning HD's Keihin Carburetors)) \\ | ||
| Use a feeler gauge to check for war-page. File or sand flat if necessary. \\ | Use a feeler gauge to check for war-page. File or sand flat if necessary. \\ | ||
| - | If war-page exists, it may leak air and drive you nuts trying to find the source of the leak. \\ | + | If warp-age exists, it may leak air and drive you nuts trying to find the source of the leak. \\ |
| ==== Choke Shaft ==== | ==== Choke Shaft ==== | ||
| Line 178: | Line 175: | ||
| * Check that the Welch plug over the top of them isn't leaking. \\ It's good to remove any old sealer over the Welch plug and install some fresh. Read about [[techtalk:ih:carb01q#welch_plug|Welch Plugs]] below. | * Check that the Welch plug over the top of them isn't leaking. \\ It's good to remove any old sealer over the Welch plug and install some fresh. Read about [[techtalk:ih:carb01q#welch_plug|Welch Plugs]] below. | ||
| * If you've dunked the carb in carb cleaner, any sealant that was around the Welch plug would now be compromised and resealing is a must. | * If you've dunked the carb in carb cleaner, any sealant that was around the Welch plug would now be compromised and resealing is a must. | ||
| + | |||
| ===== Jets ===== | ===== Jets ===== | ||
| - | {{:techtalk:ih:carb:keihin_jets_by_billblack_-_cropped-annotated.jpg?direct&400|}} ((photo by billblack of the XLFORUM, cropped & annotated by Hippysmack http://xlforum.net/forums/showthread.php?p=4770495&highlight=keihin+bowl#post4770495)) \\ | + | {{:techtalk:ih:carb:keihin_jets_by_billblack_-_cropped-annotated.jpg?direct&400|}} ((photo by billblack of the XLFORUM, cropped & annotated by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/162826-which-keihin-do-i-have?highlight=keihin+bowl#post4770495)) \\ |
| 77 and up (disregard for the L76 Sportster carb): \\ | 77 and up (disregard for the L76 Sportster carb): \\ | ||
| Line 190: | Line 188: | ||
| Read more about the function of the rubber plug (or bung) [[techtalk:ih:carb01r#slow_jet|Here]] in the Sportsterpedia. \\ | Read more about the function of the rubber plug (or bung) [[techtalk:ih:carb01r#slow_jet|Here]] in the Sportsterpedia. \\ | ||
| - | {{:techtalk:ih:carb:keihin_6_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) {{:techtalk:ih:carb:77-78_keihin_carb_1_by_pala_-_annotated.jpg?direct&200|}} ((photo by pala of the XLFORUM http://xlforum.net/forums/showthread.php?t=1771280&highlight=keihin+bowl&page=2)) \\ | + | {{:techtalk:ih:carb:keihin_6_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) {{:techtalk:ih:carb:77-78_keihin_carb_1_by_pala_-_annotated.jpg?direct&200|}} ((photo by pala of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164694-keihin-carb-issues/page2?t=1771280&highlight=keihin+bowl&page=2)) \\ |
| All year Keihin jet locations: \\ | All year Keihin jet locations: \\ | ||
| - | {{:techtalk:ih:carb:keihin_10_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\ | + | {{:techtalk:ih:carb:keihin_10_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\ |
| ===== Float disassembly / assembly ===== | ===== Float disassembly / assembly ===== | ||
| Line 201: | Line 199: | ||
| But either way is good. Do not allow any solvents to contact any rubber parts (tip of needle, O-ring seal for bowl). | But either way is good. Do not allow any solvents to contact any rubber parts (tip of needle, O-ring seal for bowl). | ||
| - | {{:techtalk:ih:carb:keihin_12_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) | + | {{:techtalk:ih:carb:keihin_12_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) |
| - | {{:techtalk:ih:carb:keihin_11_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\ | + | {{:techtalk:ih:carb:keihin_11_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\ |
| Guide the bowl so to not bend or damage the overflow tube when removing or installing it. \\ | Guide the bowl so to not bend or damage the overflow tube when removing or installing it. \\ | ||
| - | {{:techtalk:ih:carb:keihin_15_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) {{:techtalk:ih:carb:keihin_14_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) {{:techtalk:ih:carb:keihin_butterfly_1_by_sdsbassist.jpg?direct&300|}} ((photo by sdsbassist of the XLFORUM http://xlforum.net/forums/showthread.php?p=5660170&highlight=keihin+butterfly#post5660170)) \\ | + | {{:techtalk:ih:carb:keihin_15_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) {{:techtalk:ih:carb:keihin_14_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) {{:techtalk:ih:carb:keihin_butterfly_1_by_sdsbassist.jpg?direct&300|}} ((photo by sdsbassist of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/192949-76ish-bendix-carb?highlight=keihin+butterfly#post4178239)) \\ |
| ===== Accelerator pump ===== | ===== Accelerator pump ===== | ||
| - | * Clean and inspect the diaphragm for pinholes, cracks, rips, deformation, gunked up rust or varnish deposits and etc. \\ Replace the diaphragm if necessary. \\ When installing the diaphragm, you can add a bit of silicone grease or rubber grease on the lip around the outside of the diaphragm. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?p=4993565&highlight=accelerator#post4993565)) \\ It helps to make sure it slips right in the groove and stays there. \\ The diaphragm may fit snuggly in some carburetors and loose in others despite the diaphragm being the identical size. ((CVPerformance of the XLFORUM http://xlforum.net/forums/showthread.php?t=1729649&page=2)) \\ You can place a tiny amount of silicone lube (spark plug boot lube) in the groove to hold the diaphragm in place during assembly. | + | * Clean and inspect the diaphragm for pinholes, cracks, rips, deformation, gunked up rust or varnish deposits and etc. \\ Replace the diaphragm if necessary. \\ When installing the diaphragm, you can add a bit of silicone grease or rubber grease on the lip around the outside of the diaphragm. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/170268-cv-carb-backfire/page3?highlight=accelerator#post3628773)) \\ It helps to make sure it slips right in the groove and stays there. \\ The diaphragm may fit snuggly in some carburetors and loose in others despite the diaphragm being the identical size. ((CVPerformance of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/161092-accelerator-pump-diaphragm-wrong-size/page2?t=1729649&page=2)) \\ You can place a tiny amount of silicone lube (spark plug boot lube) in the groove to hold the diaphragm in place during assembly. |
| * Inspect the accelerator pump rod for bending or rust. \\ If not maintained, you may dismantle the carb to find small pile of rust in the accel pump bowl. \\ The rod can rust and rust particles can brush off of it and accumulate in the bowl. \\ You can spray the rod with a silicone lube to help cut down on rust accumulation. | * Inspect the accelerator pump rod for bending or rust. \\ If not maintained, you may dismantle the carb to find small pile of rust in the accel pump bowl. \\ The rod can rust and rust particles can brush off of it and accumulate in the bowl. \\ You can spray the rod with a silicone lube to help cut down on rust accumulation. | ||
| * Inspect the rubber boot for cracks / tears. \\ Any dirt that gets past the boot into the accelerator pump passage should be blown out from the side opposite of the nozzle. \\ (or check valve will close, making cleaning impossible) | * Inspect the rubber boot for cracks / tears. \\ Any dirt that gets past the boot into the accelerator pump passage should be blown out from the side opposite of the nozzle. \\ (or check valve will close, making cleaning impossible) | ||
| - | * Condensation gets inside and causes rust to form. ((scottfisher of the XLFORUM http://xlforum.net/forums/showthread.php?p=3749131&highlight=keihin+bowl#post3749131)) \\ The air flow will have a cooling effect on the carb and with humid summers, moisture would form and collect under the rubber seal. \\ This would be seen more from short rides in town. | + | * Condensation gets inside and causes rust to form. ((scottfisher of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/129838-winter-proj-rusty-finds?highlight=keihin+bowl#post3749131)) \\ The air flow will have a cooling effect on the carb and with humid summers, moisture would form and collect under the rubber seal. \\ This would be seen more from short rides in town. |
| - | * It's also been noted that ethanol in the fuel sucks up water from the atmosphere and corrodes the fuel system. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?p=3749131&highlight=keihin+bowl#post3749131)) \\ Generally gravitates to low points in the system - like the acc pump bowl etc. | + | * It's also been noted that ethanol in the fuel sucks up water from the atmosphere and corrodes the fuel system. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/129838-winter-proj-rusty-finds?highlight=keihin+bowl#post3749131)) \\ Generally gravitates to low points in the system - like the acc pump bowl etc. |
| - | {{:techtalk:ih:carb:keihin_butterfly_rusty_acc_pump_housing_by_mickey_t.jpg?direct&300|}} ((photo by mickey t of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073548&highlight=keihin&page=4)) {{:techtalk:ih:carb:keihin_13_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\ | + | {{:techtalk:ih:carb:keihin_butterfly_rusty_acc_pump_housing_by_mickey_t.jpg?direct&300|}} ((photo by mickey t of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/196982-circuit-breakers/page4?t=2073548&highlight=keihin&page=4)) {{:techtalk:ih:carb:keihin_13_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\ |
| \\ | \\ | ||
| Line 224: | Line 221: | ||
| There are two short screws and one long one that hold the pump housing to the float bowl. ((sportsterpaul's Keihin Rebuild Video https://www.youtube.com/watch?v=f_Ek37GEEN4&feature=youtu.be)) \\ | There are two short screws and one long one that hold the pump housing to the float bowl. ((sportsterpaul's Keihin Rebuild Video https://www.youtube.com/watch?v=f_Ek37GEEN4&feature=youtu.be)) \\ | ||
| - | {{:techtalk:ih:carb:keihin_accell_pump_diaphragm.jpg?direct&300|}} ((photos cropped - annotated by Hippysmack)) | + | {{:techtalk:ih:carb:keihin_accell_pump_diaphragm.jpg?direct&300|}} ((photos cropped - annotated by Hippysmack)) \\ |
| - | \\ | + | |
| ==== 76-78 OEM accel pumps have 2 O-rings ==== | ==== 76-78 OEM accel pumps have 2 O-rings ==== | ||
| Line 231: | Line 227: | ||
| Else, gas will leak out there instead of getting squirted into your engine. \\ | Else, gas will leak out there instead of getting squirted into your engine. \\ | ||
| One O-ring goes in the carb body pocket and the other one goes in the accel pump pocket. \\ | One O-ring goes in the carb body pocket and the other one goes in the accel pump pocket. \\ | ||
| - | {{:techtalk:ih:carb:keihin_butterfly_carb_17_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3)) | + | {{:techtalk:ih:carb:keihin_butterfly_carb_17_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3)) |
| ==== 79-up OEM accel pumps have 1 O-ring ==== | ==== 79-up OEM accel pumps have 1 O-ring ==== | ||
| Line 240: | Line 236: | ||
| Below is an accelerator pump on 1981-Early 1982 27469-81A (B83F). There is only 1 thru hole from the pump to carb body. \\ | Below is an accelerator pump on 1981-Early 1982 27469-81A (B83F). There is only 1 thru hole from the pump to carb body. \\ | ||
| The one hole acts as both a fuel filler and accelerator discharge by way of a check ball in the bowl to pump passage. \\ | The one hole acts as both a fuel filler and accelerator discharge by way of a check ball in the bowl to pump passage. \\ | ||
| - | {{:techtalk:ih:carb:keihin_18_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=3)) {{:techtalk:ih:carb:keihin_16_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=3)) {{:techtalk:ih:carb:keihin_17_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=3)) \\ | + | {{:techtalk:ih:carb:keihin_18_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?t=1760294&page=3)) {{:techtalk:ih:carb:keihin_16_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?t=1760294&page=3)) {{:techtalk:ih:carb:keihin_17_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?t=1760294&page=3)) \\ |
| ==== Testing the Accelerator Pump Off the Carb ==== | ==== Testing the Accelerator Pump Off the Carb ==== | ||
| It's good to test the accelerator pump function before installing the carb on the bike. Else, you'll just have to take it back off if it doesn't work. \\ | It's good to test the accelerator pump function before installing the carb on the bike. Else, you'll just have to take it back off if it doesn't work. \\ | ||
| - | * Take the bowl the pump rod off the carb with the pump housing still installed. \\ Put some fuel in the bowl (you can also use water as it is fire safe and nonflammable) and put the pump rod in it's hole in the bowl. ((rivethog of the XLFORUM http://xlforum.net/forums/showthread.php?p=4533873#post4533873)) \\ Push the pump rod with your finger and see if you get spray out of the brass nozzle. \\ You will see it flow in a stream (not intermittent) when the pump is working. | + | * Take the bowl the pump rod off the carb with the pump housing still installed. \\ Put some fuel in the bowl (you can also use water as it is fire safe and nonflammable) and put the pump rod in it's hole in the bowl. ((rivethog of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/155008-weird-keihin-carb-problem/page4#post3306949)) \\ Push the pump rod with your finger and see if you get spray out of the brass nozzle. \\ You will see it flow in a stream (not intermittent) when the pump is working. |
| * If the pump doesn't spray a stream; | * If the pump doesn't spray a stream; | ||
| * Check the diaphragm for damage / proper seating. | * Check the diaphragm for damage / proper seating. | ||
| Line 252: | Line 249: | ||
| * The nozzle check valve and/or check ball should rattle in the bowl housing. | * The nozzle check valve and/or check ball should rattle in the bowl housing. | ||
| * There is a check for both the inlet and outlet of the accelerator pump system. | * There is a check for both the inlet and outlet of the accelerator pump system. | ||
| - | * If you cant hear it, it's stuck and the accelerator pump will not work. ((81Fe of the XLFORUM http://xlforum.net/forums/showthread.php?t=1663198&page=7)) | + | * If you cant hear it, it's stuck and the accelerator pump will not work. ((81Fe of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/155008-weird-keihin-carb-problem/page7?t=1663198&page=7)) |
| - | + | ||
| ==== Accelerator Pump Rod Length ==== | ==== Accelerator Pump Rod Length ==== | ||
| Line 270: | Line 265: | ||
| If it projects too far, disassemble the rod and grind off the required amount from the straight end.// \\ | If it projects too far, disassemble the rod and grind off the required amount from the straight end.// \\ | ||
| - | Joe Minton wrote a popular magazine article in which he describes this as well. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3)) ((Joe Minton Article "Tuning HD's Keihin Carburetors)) \\ | + | Joe Minton wrote a popular magazine article in which he describes this as well. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3)) ((Joe Minton Article "Tuning HD's Keihin Carburetors)) \\ |
| According to the article, filing the end off the accelerator pump rod is another important modification to aid smooth idle. \\ | According to the article, filing the end off the accelerator pump rod is another important modification to aid smooth idle. \\ | ||
| This stops it resting on the pump diaphragm at idle and jiggling it up and down, pumping minute amounts of fuel into the carb throat. \\ | This stops it resting on the pump diaphragm at idle and jiggling it up and down, pumping minute amounts of fuel into the carb throat. \\ | ||
| Line 276: | Line 271: | ||
| The actual length is hard to measure because the end is not square. But it still sticks out beyond the carb body at idle and pushes on the diaphragm. \\ | The actual length is hard to measure because the end is not square. But it still sticks out beyond the carb body at idle and pushes on the diaphragm. \\ | ||
| - | The carb 'trouble shooting chart' in the manual lists "accelerator pump pushrod incorrectly adjusted" as one cause of rough idle. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3)) \\ | + | The carb 'trouble shooting chart' in the manual lists "accelerator pump pushrod incorrectly adjusted" as one cause of rough idle. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3)) \\ |
| But it does not offer any information on how to adjust it. \\ | But it does not offer any information on how to adjust it. \\ | ||
| The TSB mentioned above sets the depth at .040" so we have that plus the measurement in the parts catalogs. \\ | The TSB mentioned above sets the depth at .040" so we have that plus the measurement in the parts catalogs. \\ | ||
| Line 287: | Line 282: | ||
| **Note**: \\ | **Note**: \\ | ||
| - | If the accelerator pump rod is too long, it will be spurting fuel at steady throttle. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=10)) ((oldnavy of the XLFORUM http://xlforum.net/forums/showthread.php?t=877868&page=2)) \\ | + | If the accelerator pump rod is too long, it will be spurting fuel at steady throttle. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page10?t=276157&page=10)) ((oldnavy of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/101363-keihin-butterfly-accelerator-adjustments/page2?t=877868&page=2)) \\ |
| Check by removing the air cleaner cover and see if any fuel is leaking or spitting from the accel pump nozzle. \\ | Check by removing the air cleaner cover and see if any fuel is leaking or spitting from the accel pump nozzle. \\ | ||
| If it is spitting, you will be able to see it doing so. Correct by removing the rod and shortening it to 2.34" (59.5mm). \\ | If it is spitting, you will be able to see it doing so. Correct by removing the rod and shortening it to 2.34" (59.5mm). \\ | ||
| Line 293: | Line 288: | ||
| - | |Measure the rod length. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|File bottom straight end. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Pump rod flush to body with throttle closed. ((photo by sifty of the XLFORUM))| | + | |Measure the rod length. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|File bottom straight end. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Pump rod flush to body with throttle closed. ((photo by sifty of the XLFORUM))| |
| |{{:techtalk:ih:carb:keihin_butterfly_carb_8_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_9_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_17_by_county_fair_-_annotated.jpg?direct&300|}}| | |{{:techtalk:ih:carb:keihin_butterfly_carb_8_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_9_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_17_by_county_fair_-_annotated.jpg?direct&300|}}| | ||
| Line 306: | Line 301: | ||
| Then pry the plug out using a pick or you could twist a small sheet metal screw into the hole to pull the plug out. \\ | Then pry the plug out using a pick or you could twist a small sheet metal screw into the hole to pull the plug out. \\ | ||
| With the plug removed clean the area around the mixture screw so no metal fragments remain. \\ | With the plug removed clean the area around the mixture screw so no metal fragments remain. \\ | ||
| - | {{techtalk:evo:carb:cv40-imscap-drillbit.jpg?300|}} ((photo by cantolina of the XLFORUM http://xlforum.net/forums/showthread.php?t=14949)) Circled area is where you drill out the plug. {{:techtalk:ref:carb:idle_mixture_screw_location_by_popgadget-_annotated.jpg?direct&300|}} ((photo by popgadget of the XLFORUM, annotated by Hippysmack)) \\ | + | {{techtalk:evo:carb:cv40-imscap-drillbit.jpg?300|}} ((photo by cantolina of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/9621-carb-adjusting-where-are-the-jets-and-the-mixture-screw?t=14949)) Circled area is where you drill out the plug. {{:techtalk:ref:carb:idle_mixture_screw_location_by_popgadget-_annotated.jpg?direct&300|}} ((photo by popgadget of the XLFORUM, annotated by Hippysmack)) \\ |
| Some have cut the idle mixture screw tower down for easier access to the screw when adjusting. \\ | Some have cut the idle mixture screw tower down for easier access to the screw when adjusting. \\ | ||
| Be sure to stuff some material (pantyhose etc.) in the hole beforehand and blow out the hole and passages with compressed air afterwards. \\ You can also just buy a longer thumbscrew. See more on the EZjust screw below. \\ | Be sure to stuff some material (pantyhose etc.) in the hole beforehand and blow out the hole and passages with compressed air afterwards. \\ You can also just buy a longer thumbscrew. See more on the EZjust screw below. \\ | ||
| {{:techtalk:ih:carb:keihin_butterfly_mixture_screw_tower_cut_down.jpg?direct&300|}} \\ | {{:techtalk:ih:carb:keihin_butterfly_mixture_screw_tower_cut_down.jpg?direct&300|}} \\ | ||
| - | |||
| - | |||
| ==== EZ-Just Mixture Screws ==== | ==== EZ-Just Mixture Screws ==== | ||
| Line 328: | Line 321: | ||
| - | | Stock idle mixture screw ((photo by sifty of the XLFORUM http://xlforum.net/forums/showthread.php?t=1592463&page=48)) | Stock mixture screw (top) compared to the \\ E-Z-Just mixture screw (bottom) ((photo by sifty of the XLFORUM http://xlforum.net/forums/showthread.php?t=1592463&page=48)) | As installed on top of carb. ((photo by sifty of the XLFORUM http://xlforum.net/forums/showthread.php?t=1592463&page=48)) | | + | | Stock idle mixture screw ((photo by sifty of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/146604-first-harley-1975-xl1000-caf%C3%A9-project/page48?t=1592463&page=48)) | Stock mixture screw (top) compared to the \\ E-Z-Just mixture screw (bottom) ((photo by sifty of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/146604-first-harley-1975-xl1000-caf%C3%A9-project/page48?t=1592463&page=48)) | As installed on top of carb. ((photo by sifty of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/146604-first-harley-1975-xl1000-caf%C3%A9-project/page48?t=1592463&page=48)) | |
| |{{:techtalk:evo:carb:idle_mixture_screw_1_by_sifty.jpg?direct&300|}}|{{:techtalk:evo:carb:idle_mixture_screw_2_by_sifty.jpg?direct&300|}}|{{:techtalk:evo:carb:idle_mixture_screw_5_by_sifty.jpg?direct&300|}}| | |{{:techtalk:evo:carb:idle_mixture_screw_1_by_sifty.jpg?direct&300|}}|{{:techtalk:evo:carb:idle_mixture_screw_2_by_sifty.jpg?direct&300|}}|{{:techtalk:evo:carb:idle_mixture_screw_5_by_sifty.jpg?direct&300|}}| | ||
| - | |||
| - | |||
| ===== Welch plug ===== | ===== Welch plug ===== | ||
| Line 340: | Line 331: | ||
| * Whenever a welsh plug is removed, a new one should be installed in it's place, especially since a large part of the time, removal of one means destroying or deforming it.((1959-1969 HD Sportster FSM)) | * Whenever a welsh plug is removed, a new one should be installed in it's place, especially since a large part of the time, removal of one means destroying or deforming it.((1959-1969 HD Sportster FSM)) | ||
| * Drill an 1/8" hole thru it (just deep enough to break thru to the other side) off center and pry it out with a small punch. Be careful not to drill too deep which could destroy the nozzle assembly or casting. While prying it out, be careful not to damage the casting counter-bore edges around the plug. | * Drill an 1/8" hole thru it (just deep enough to break thru to the other side) off center and pry it out with a small punch. Be careful not to drill too deep which could destroy the nozzle assembly or casting. While prying it out, be careful not to damage the casting counter-bore edges around the plug. | ||
| - | * You can also drill a small hole in it and use a small tap just big enough to start in the hole. ((snake173 of the XLFORUM http://xlforum.net/forums/showpost.php?p=3646523&postcount=1)) \\ Thread the tap in the hole. \\ When it gets to the bottom of the passage, it will force the valve out with out damaging the bottom of carb passage. \\ Make sure to clean all the chips out to keep from plugging up passages later. | + | * You can also drill a small hole in it and use a small tap just big enough to start in the hole. ((snake173 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/108002-zenith-bendix-carb-rebuild-kits/page3?postcount=1#post2687578)) \\ Thread the tap in the hole. \\ When it gets to the bottom of the passage, it will force the valve out with out damaging the bottom of carb passage. \\ Make sure to clean all the chips out to keep from plugging up passages later. |
| * Installation: ((HD Service Bulletin #518 dated September 10, 1965 pg OC-189))((1959-1969 HD Sportster FSM)). | * Installation: ((HD Service Bulletin #518 dated September 10, 1965 pg OC-189))((1959-1969 HD Sportster FSM)). | ||
| * The plug should be seated with a flat end punch that is slightly smaller than the diameter of the plug. The plug should be flat and not concaved to assure a tight fit. If leakage is suspected due to a rough or damaged welch plug seat in the casting, apply a small amount of epoxy or suitable sealant to the edges after installing it. | * The plug should be seated with a flat end punch that is slightly smaller than the diameter of the plug. The plug should be flat and not concaved to assure a tight fit. If leakage is suspected due to a rough or damaged welch plug seat in the casting, apply a small amount of epoxy or suitable sealant to the edges after installing it. | ||
| Line 350: | Line 341: | ||
| As a precautionary measure to eliminate possible air leaks, apply an adhesive type sealer to the two welch plugs in the top of the carb. ((HD TSB #M707 dated December 1, 1976)) \\ | As a precautionary measure to eliminate possible air leaks, apply an adhesive type sealer to the two welch plugs in the top of the carb. ((HD TSB #M707 dated December 1, 1976)) \\ | ||
| Apply a minimal amount only to the joints between the edges of the plugs and casting. \\ | Apply a minimal amount only to the joints between the edges of the plugs and casting. \\ | ||
| - | {{:techtalk:ih:carb:welch_plug_1_by_civil_war_harley.jpg?direct&200|}} ((photo by Civil War Harley of the XLFORUM http://xlforum.net/forums/showthread.php?t=2002662&highlight=keihin+accelerator+pump&page=2)) {{:techtalk:ih:carb:welch_plug_2_by_civil_war_harley.jpg?direct&200|}} ((photo by Civil War Harley of the XLFORUM http://xlforum.net/forums/showthread.php?t=2002662&highlight=keihin+accelerator+pump&page=2)){{:techtalk:ih:carb:welch_plug_3_by_civil_war_harley.jpg?direct&200|}} ((photo by Civil War Harley of the XLFORUM http://xlforum.net/forums/showthread.php?t=2002662&highlight=keihin+accelerator+pump&page=2)) \\ | + | {{:techtalk:ih:carb:welch_plug_1_by_civil_war_harley.jpg?direct&200|}} ((photo by Civil War Harley of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187542-keihin-carb-repair/page2?t=2002662&highlight=keihin+accelerator+pump&page=2)) {{:techtalk:ih:carb:welch_plug_2_by_civil_war_harley.jpg?direct&200|}} ((photo by Civil War Harley of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187542-keihin-carb-repair/page2?t=2002662&highlight=keihin+accelerator+pump&page=2)){{:techtalk:ih:carb:welch_plug_3_by_civil_war_harley.jpg?direct&200|}} ((photo by Civil War Harley of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187542-keihin-carb-repair/page2?t=2002662&highlight=keihin+accelerator+pump&page=2)) \\ |
| ===== Fuel inlet fitting ===== | ===== Fuel inlet fitting ===== | ||
| Line 361: | Line 352: | ||
| {{:techtalk:ih:carb:keihin_plastic_fuel_inlet.jpg?direct&200|}} {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_5_by_hippysmack.jpg?direct&270|}} {{:techtalk:ih:carb:brass_fuel_inlet_on_keihin_carb.jpg?direct&200|}} | {{:techtalk:ih:carb:keihin_plastic_fuel_inlet.jpg?direct&200|}} {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_5_by_hippysmack.jpg?direct&270|}} {{:techtalk:ih:carb:brass_fuel_inlet_on_keihin_carb.jpg?direct&200|}} | ||
| - | Or you can just break the plastic off the brass ferule with a pliers. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=209347&highlight=float+level&page=21)) \\ | + | Or you can just break the plastic off the brass ferule with a pliers. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page21?t=209347&highlight=float+level&page=21)) \\ |
| Then file down the serrations underneath and plumb in some gas line to clamp straight onto it then connect to an elbow. \\ | Then file down the serrations underneath and plumb in some gas line to clamp straight onto it then connect to an elbow. \\ | ||
| - | {{:techtalk:ih:carb:keihin_butterfly_carb_23_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=209347&highlight=float+level&page=21)) | + | {{:techtalk:ih:carb:keihin_butterfly_carb_23_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page21?t=209347&highlight=float+level&page=21)) |
| - | {{:techtalk:ih:carb:keihin_butterfly_carb_24_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=209347&highlight=float+level&page=21)) | + | {{:techtalk:ih:carb:keihin_butterfly_carb_24_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page21?t=209347&highlight=float+level&page=21)) |
| - | {{:techtalk:ih:carb:keihin_butterfly_carb_25_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=209347&highlight=float+level&page=21)) \\ | + | {{:techtalk:ih:carb:keihin_butterfly_carb_25_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page21?t=209347&highlight=float+level&page=21)) \\ |
| ===== Broken flange repair ===== | ===== Broken flange repair ===== | ||
| - | |||
| For a broken flange, you can try milling some slots in the flange and drill and tap the holes for screws. \\ | For a broken flange, you can try milling some slots in the flange and drill and tap the holes for screws. \\ | ||
| You can use some JB Weld in there to insure a good seal. \\ | You can use some JB Weld in there to insure a good seal. \\ | ||
| - | {{:techtalk:ih:carb:86_keihin_carb_repair_1_by_bustakneecap.jpg?direct&300|}} ((photo by bustakneecap of the XLFORUM http://xlforum.net/forums/showthread.php?p=3864149)) {{:techtalk:ih:carb:86_keihin_carb_repair_2_by_bustakneecap.jpg?direct&300|}} ((photo by bustakneecap of the XLFORUM http://xlforum.net/forums/showthread.php?p=3864149)) {{:techtalk:ih:carb:86_keihin_carb_repair_3_by_bustakneecap.jpg?direct&300|}} ((photo by bustakneecap of the XLFORUM http://xlforum.net/forums/showthread.php?p=3864149)) \\ | + | {{:techtalk:ih:carb:86_keihin_carb_repair_1_by_bustakneecap.jpg?direct&300|}} ((photo by bustakneecap of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/132711-1986-883-carb-needed#post2833664)) {{:techtalk:ih:carb:86_keihin_carb_repair_2_by_bustakneecap.jpg?direct&300|}} ((photo by bustakneecap of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/132711-1986-883-carb-needed#post2833664)) {{:techtalk:ih:carb:86_keihin_carb_repair_3_by_bustakneecap.jpg?direct&300|}} ((photo by bustakneecap of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/132711-1986-883-carb-needed#post2833664)) \\ |
| ===== Choke Rod / Cable ===== | ===== Choke Rod / Cable ===== | ||
| - | |||
| The old factory steel choke wire and the steel bracket works best. \\ | The old factory steel choke wire and the steel bracket works best. \\ | ||
| When the bike backfires, it resists slapping the choke shut. \\ | When the bike backfires, it resists slapping the choke shut. \\ | ||
| The cable type ones allow more flex at the bracket and subsequently the choke plate. \\ | The cable type ones allow more flex at the bracket and subsequently the choke plate. \\ | ||
| + | |||
| ===== High Altitude Modification Kit ===== | ===== High Altitude Modification Kit ===== | ||
| Line 392: | Line 381: | ||
| **Note**, any motorcycle modified for high altitude operation must be converted back to standard if operated at altitudes below 4000 feet. \\ An overly lean condition can cause engine damage. | **Note**, any motorcycle modified for high altitude operation must be converted back to standard if operated at altitudes below 4000 feet. \\ An overly lean condition can cause engine damage. | ||
| - | |||
| - | |||
| ====== Helpful Links ====== | ====== Helpful Links ====== | ||
| **Video**: \\ | **Video**: \\ | ||
| - | Here are some excellent videos of servicing the pre-CV Keihin Butterfly carbs:((Used by permission of SportsterPaul at the XLForum - http://xlforum.net/forums/showthread.php?t=2055701)) | + | Here are some excellent videos of servicing the pre-CV Keihin Butterfly carbs:((Used by permission of SportsterPaul at the XLForum - https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/192176-keihin-butterfly-carb-rebuild-videos?t=2055701)) |
| * [[https://youtu.be/f_Ek37GEEN4|#1 - Tips and tricks.]]\\ | * [[https://youtu.be/f_Ek37GEEN4|#1 - Tips and tricks.]]\\ | ||
