Differences
This shows you the differences between two versions of the page.
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techtalk:ih:carb01m [2022/11/25 20:43] hippysmack [Swapping from a Tillotson to a Bendix] |
techtalk:ih:carb01m [2023/12/29 17:46] (current) hippysmack |
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| For a quick visual, look at the top of the carb, first screw boss from the A/C, look for either a welch plug or a screw head with no spring under it. \\ | For a quick visual, look at the top of the carb, first screw boss from the A/C, look for either a welch plug or a screw head with no spring under it. \\ | ||
| - | The screw head looks like it could be adjusted but it is not the adjustable type. ((fergerburger of the XLFORUM http://xlforum.net/forums/showthread.php?t=988224&page=2)) \\ | + | The screw head looks like it could be adjusted but it is not the adjustable type. ((fergerburger 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/page2?t=988224&page=2)) \\ |
| The later 'Zenith' Carb with the adjustable main has a screw that goes thru a spring. \\ | The later 'Zenith' Carb with the adjustable main has a screw that goes thru a spring. \\ | ||
| Line 27: | Line 27: | ||
| ==== Main jet ==== | ==== Main jet ==== | ||
| - | |||
| The main jet screw is the one closest to the air cleaner. The Idle screw is closer to the manifold. \\ | The main jet screw is the one closest to the air cleaner. The Idle screw is closer to the manifold. \\ | ||
| The main jet doubles as the float bowl securing bolt under the carb. \\ | The main jet doubles as the float bowl securing bolt under the carb. \\ | ||
| Line 34: | Line 33: | ||
| Alternate references include intermediate / idle / low speed jet. The original idle tubes are designated with either | Alternate references include intermediate / idle / low speed jet. The original idle tubes are designated with either | ||
| - | The "needle" is just a transfer tube to get low speed mix from the bottom of main up to the top side of the carb to the idle/low speed circuitry. ((CHOPTOP37 of the XLFORUM http://xlforum.net/forums/showthread.php?p=4829064#post4829064)) \\ | + | The "needle" is just a transfer tube to get low speed mix from the bottom of main up to the top side of the carb to the idle/low speed circuitry. ((CHOPTOP37 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164630-bendix-stutter-intermediate-jet/page3#post3508138)) \\ |
| The tube is a pretty sloppy fit where it enters the top of the carb, below the threads. \\ | The tube is a pretty sloppy fit where it enters the top of the carb, below the threads. \\ | ||
| There is a built in air bleed circuit between the idle tube passage and idle mixture circuit. \\ | There is a built in air bleed circuit between the idle tube passage and idle mixture circuit. \\ | ||
| - | It's location of the idle air bleed allows less fuel flow during time of open throttle plate high reversion compared to the other OEM carbs. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1770307&page=5)) \\ | + | It's location of the idle air bleed allows less fuel flow during time of open throttle plate high reversion compared to the other OEM carbs. ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164630-bendix-stutter-intermediate-jet/page5?t=1770307&page=5)) \\ |
| Translation: it's the bleed that allows the Bendix to tolerate straights better. \\ | Translation: it's the bleed that allows the Bendix to tolerate straights better. \\ | ||
| The Idle Tube on top of 72-74 OEM carbs is a brass flat top screw that screws thru a fiber washer down thru the top into that fixed main jet (all non adjustable). \\ | The Idle Tube on top of 72-74 OEM carbs is a brass flat top screw that screws thru a fiber washer down thru the top into that fixed main jet (all non adjustable). \\ | ||
| From 1972-1974, the idle tube was exposed on top of the carb with a brass screw for installation. \\ | From 1972-1974, the idle tube was exposed on top of the carb with a brass screw for installation. \\ | ||
| - | {{:techtalk:ih:carb:72-74_bendix_idle_tube_by_jayd142.jpg?direct&300|}} ((photo by jayd241 of the XLFORUM http://xlforum.net/forums/showthread.php?p=4911522)) {{:techtalk:ih:carb:72-74_bendix_idle_tube_location_by_the_doctor71_annotated_by_hippysmack.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072203&page=2)) | + | {{:techtalk:ih:carb:72-74_bendix_idle_tube_by_jayd142.jpg?direct&300|}} ((photo by jayd241 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/167495-bendix-carb-rebuild-beat-up-idle-tube#post3568870)) {{:techtalk:ih:carb:72-74_bendix_idle_tube_location_by_the_doctor71_annotated_by_hippysmack.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195791-bendix-zenith-questions/page2?t=2072203&page=2)) |
| The idle tube on 75-E76 carbs is pressed into the body with a welch plug covering it. \\ | The idle tube on 75-E76 carbs is pressed into the body with a welch plug covering it. \\ | ||
| Line 49: | Line 48: | ||
| This screw in tube with the small spring actually doubles as an idle tube to pick up fuel up to the idle circuit. \\ | This screw in tube with the small spring actually doubles as an idle tube to pick up fuel up to the idle circuit. \\ | ||
| But the taper at the end of it is to adjust the main circuit. \\ | But the taper at the end of it is to adjust the main circuit. \\ | ||
| - | The size / markings / pilot orifice of the adjustable idle tube is not known. ((CHOPTOP37 of the XLFORUM http://xlforum.net/forums/showthread.php?p=4829064#post4829064))) \\ | + | The size / markings / pilot orifice of the adjustable idle tube is not known. ((CHOPTOP37 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164630-bendix-stutter-intermediate-jet/page3#post3508138))) \\ |
| But you could use a pin gauge or drill bit to measure should you feel the need to work on this circuit. \\ | But you could use a pin gauge or drill bit to measure should you feel the need to work on this circuit. \\ | ||
| - | Keep in mind the adjustable main's biggest job is it blocks or opens the main circuit with the taper at the end. ((CHOPTOP37 of the XLFORUM http://xlforum.net/forums/showthread.php?p=4829064#post4829064))) \\ | + | Keep in mind the adjustable main's biggest job is it blocks or opens the main circuit with the taper at the end. ((CHOPTOP37 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164630-bendix-stutter-intermediate-jet/page3#post3508138))) \\ |
| The rest of the tube / orifice has nothing to do with that. That is for the low speed. \\ | The rest of the tube / orifice has nothing to do with that. That is for the low speed. \\ | ||
| Like any adjustable jet, you cannot over tighten it clockwise or you can indent the taper. \\ | Like any adjustable jet, you cannot over tighten it clockwise or you can indent the taper. \\ | ||
| Line 69: | Line 68: | ||
| Then it is seated when the pump shaft is actuated by way of pressure created in the accel passage of the bowl which pushes the disc up into the seat. \\ | Then it is seated when the pump shaft is actuated by way of pressure created in the accel passage of the bowl which pushes the disc up into the seat. \\ | ||
| - | {{:techtalk:ih:carb:clearing_the_bendix_accel_pump_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071854)) {{:techtalk:ih:carb:original_bendix_check_valve_1_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074658)) | + | {{:techtalk:ih:carb:clearing_the_bendix_accel_pump_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195495-bendix-carb-accelerator-jet-plugged?t=2071854)) {{:techtalk:ih:carb:original_bendix_check_valve_1_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197956-zenith-bendix-check-valve?t=2074658)) |
| - | {{:techtalk:ih:carb:original_bendix_check_valve_2_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074658)) \\ | + | {{:techtalk:ih:carb:original_bendix_check_valve_2_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197956-zenith-bendix-check-valve?t=2074658)) \\ |
| - | + | ||
| - | {{:techtalk:ih:carb:original_bendix_check_valve_3_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074658)) | + | |
| - | {{:techtalk:ih:carb:original_bendix_check_valve_4_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074658)) | + | |
| - | {{:techtalk:ih:carb:original_bendix_check_valve_5_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074658)) \\ | + | |
| - | + | ||
| + | {{:techtalk:ih:carb:original_bendix_check_valve_3_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197956-zenith-bendix-check-valve?t=2074658)) | ||
| + | {{:techtalk:ih:carb:original_bendix_check_valve_4_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197956-zenith-bendix-check-valve?t=2074658)) | ||
| + | {{:techtalk:ih:carb:original_bendix_check_valve_5_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197956-zenith-bendix-check-valve?t=2074658)) \\ | ||
| ===== Choke Plate \ Cable ===== | ===== Choke Plate \ Cable ===== | ||
| Line 85: | Line 81: | ||
| It should be moved to wide open when the engine is patially warmed up. \\ | It should be moved to wide open when the engine is patially warmed up. \\ | ||
| - | Here is a pic of what the installation of the choke/throttle butterfly looks like. The small hole/cutout is at the top. ((piniongear of the XLFORUM http://xlforum.net/forums/showpost.php?p=3171560&postcount=16)) \\ | + | Here is a pic of what the installation of the choke/throttle butterfly looks like. The small hole/cutout is at the top. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112695-bendix-rebuilt-and-installed-but-troubles/page2?postcount=16#post2368179)) \\ |
| - | {{:techtalk:ih:carb:bendix_pic_3_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showpost.php?p=3171560&postcount=16)) \\ | + | {{:techtalk:ih:carb:bendix_pic_3_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112695-bendix-rebuilt-and-installed-but-troubles/page2?postcount=16#post2368179)) \\ |
| - | The throttle butterfly in the main body opens to the manifold. ((brianbbs67 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1770307&page=2)) \\ | + | The throttle butterfly in the main body opens to the manifold. ((brianbbs67 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164630-bendix-stutter-intermediate-jet/page2?t=1770307&page=2)) \\ |
| When it's shut, no throttle, you should be able to hold the intake side of the carb up to the light and not see anything around it showing light. \\ | When it's shut, no throttle, you should be able to hold the intake side of the carb up to the light and not see anything around it showing light. \\ | ||
| If it does, it's out of round and hard to fix as it leans out the mix. \\ | If it does, it's out of round and hard to fix as it leans out the mix. \\ | ||
| **Adjusting the choke cable**: \\ | **Adjusting the choke cable**: \\ | ||
| - | Push the knob all the way in, have the choke wide open, tighten set screw on the cable. ((egarrett of the XLFORUM http://xlforum.net/forums/showthread.php?t=2022848&page=3)) \\ | + | Push the knob all the way in, have the choke wide open, tighten set screw on the cable. ((egarrett of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/189685-bendix-choke-question/page3?t=2022848&page=3)) \\ |
| ===== Throttle Cable ===== | ===== Throttle Cable ===== | ||
| Line 99: | Line 95: | ||
| You may want to bend the end of the bracket just a bit upwards to lessen the binding at closed throttle. \\ | You may want to bend the end of the bracket just a bit upwards to lessen the binding at closed throttle. \\ | ||
| As you open the throttle the cable becomes more inline with the housing and binding becomes less and less. | As you open the throttle the cable becomes more inline with the housing and binding becomes less and less. | ||
| - | The butterfly is going to go and stay where the cable tells it to go. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3446817#post3446817)) \\ | + | The butterfly is going to go and stay where the cable tells it to go. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122135-blipping-throttle-causes-runaway-rpm#post2555914)) \\ |
| The cable can bind with the hard wire throttle. The sketch below is exaggerated but it will give you a general idea of what can bind when the throttle is opened. \\ | The cable can bind with the hard wire throttle. The sketch below is exaggerated but it will give you a general idea of what can bind when the throttle is opened. \\ | ||
| The cable is straight and the bell crank on the carb turns in a circular motion around the pivot point of the butterfly shaft. \\ | The cable is straight and the bell crank on the carb turns in a circular motion around the pivot point of the butterfly shaft. \\ | ||
| - | {{:techtalk:ih:carb:bendix_throttle_cable_mech_by_piniongear.jpg?direct&400|}} ((drawing by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3446817#post3446817)) \\ | + | {{:techtalk:ih:carb:bendix_throttle_cable_mech_by_piniongear.jpg?direct&400|}} ((drawing by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122135-blipping-throttle-causes-runaway-rpm#post2555914)) \\ |
| ==== Swapping from a Tillotson to a Bendix Carb ==== | ==== Swapping from a Tillotson to a Bendix Carb ==== | ||
| - | If you want to swap from a Tillotson to a Bendix, you will have to purchase a reverse grip spiral. Look up part# 56220-58 at J&P Cycles. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=757993&page=4)) \\ | + | If you want to swap from a Tillotson to a Bendix, you will have to purchase a reverse grip spiral. Look up part# 56220-58 at J&P Cycles. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/92522-another-tillotson-magneto-hard-to-start-xlch-question/page4?t=757993&page=4)) \\ |
| - | Harley part # 56220-58 (pulls). Harley part # 56220-53 (pushes). ((needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072323)) \\ | + | Harley part # 56220-58 (pulls). Harley part # 56220-53 (pushes). ((needspeed of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195893-from-tillitson-to-mikuni-vm38-9-throttle-set-up?t=2072323)) \\ |
| The reason you need this is because the Tillotson opens up by rolling the throttle back to open the carb. This is normal. \\ | The reason you need this is because the Tillotson opens up by rolling the throttle back to open the carb. This is normal. \\ | ||
| If you stick a Bendix on the bike with your same throttle, you will find that to open the throttle you will be rolling the throttle forward. \\ | If you stick a Bendix on the bike with your same throttle, you will find that to open the throttle you will be rolling the throttle forward. \\ | ||
| The reason for this is because of the two carbs butterfly actuator opens differently from each other. \\ | The reason for this is because of the two carbs butterfly actuator opens differently from each other. \\ | ||
| You can see the two different type spirals here. One for a pull (Bendix) and one for a push (Tillotson). \\ | You can see the two different type spirals here. One for a pull (Bendix) and one for a push (Tillotson). \\ | ||
| - | {{:techtalk:ih:carb:throttle_grips_by_sleighcrane.jpg?direct&300|}} ((photo by sleighcrane of the XLFORUM http://xlforum.net/forums/showthread.php?p=5747569&highlight=bendix#post5747569)) \\ | + | {{:techtalk:ih:carb:throttle_grips_by_sleighcrane.jpg?direct&300|}} ((photo by sleighcrane of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/196764-lookin-for-tips-on-carb-linkage?highlight=bendix#post5747569)) \\ |
| \\ | \\ | ||
| - | One solution was to fabricate a cable holder that was able to rotate slightly as the angle of the cable changed. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3446817#post3446817)) \\ | + | One solution was to fabricate a cable holder that was able to rotate slightly as the angle of the cable changed. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122135-blipping-throttle-causes-runaway-rpm#post2555914)) \\ |
| This has a bronze ball inside the capping pieces which rotates as the cable moves around. \\ | This has a bronze ball inside the capping pieces which rotates as the cable moves around. \\ | ||
| The bracket is mounted to the back side of the manifold (towards the center of the frame). \\ | The bracket is mounted to the back side of the manifold (towards the center of the frame). \\ | ||
| Line 123: | Line 119: | ||
| This allows the housing to rotate as the throttle is opened and closed. \\ | This allows the housing to rotate as the throttle is opened and closed. \\ | ||
| - | {{:techtalk:ih:carb:bendix_throttle_cable_mod_1_by_piniongear.jpg?direct&300 |}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3446817#post3446817)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_2_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3446817#post3446817)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_3_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639)) \\ | + | {{:techtalk:ih:carb:bendix_throttle_cable_mod_1_by_piniongear.jpg?direct&300 |}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122135-blipping-throttle-causes-runaway-rpm#post2555914)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_2_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122135-blipping-throttle-causes-runaway-rpm#post2555914)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_3_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch?t=1069639)) \\ |
| - | Another simple way for the internal throttle setup: ((Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=4)) \\ | + | Another simple way for the internal throttle setup: ((Monte03 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page4?t=1069639&page=4)) \\ |
| Fab a 90° bracket that is mounted off the top manifold bolt. \\ | Fab a 90° bracket that is mounted off the top manifold bolt. \\ | ||
| Then purchase an HD cable clamp (9994) and route the cable through the left side and adjust so that its inline with carb swivel. \\ | Then purchase an HD cable clamp (9994) and route the cable through the left side and adjust so that its inline with carb swivel. \\ | ||
| The 9994 is the same factory clamp as used for a magneto cable (disregard the spring shown, it's not needed) \\ | The 9994 is the same factory clamp as used for a magneto cable (disregard the spring shown, it's not needed) \\ | ||
| - | {{:techtalk:ih:carb:throttle_cable_1_by_monte03.jpg?direct&300|}} ((photo by Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=4)) {{:techtalk:ih:carb:throttle_cable_2_by_monte03.jpg?direct&300|}} ((photo by Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=4)) \\ | + | {{:techtalk:ih:carb:throttle_cable_1_by_monte03.jpg?direct&300|}} ((photo by Monte03 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page4?t=1069639&page=4)) {{:techtalk:ih:carb:throttle_cable_2_by_monte03.jpg?direct&300|}} ((photo by Monte03 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page4?t=1069639&page=4)) \\ |
| - | If you're using a braided cable, it needs a return spring on the butterfly. If you do not, then that will result in high revs when you blip the throttle. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3446817#post3446817)) \\ | + | If you're using a braided cable, it needs a return spring on the butterfly. If you do not, then that will result in high revs when you blip the throttle. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122135-blipping-throttle-causes-runaway-rpm#post2555914)) \\ |
| The hard wire is what opens and closes the butterfly. The braided cable cannot close the butterfly because the cable is not stiff enough. \\ | The hard wire is what opens and closes the butterfly. The braided cable cannot close the butterfly because the cable is not stiff enough. \\ | ||
| Even if you find broken strands, be sure to rig up a spring. It wont take a great deal of spring tension to close the butterfly, but a spring is needed. \\ | Even if you find broken strands, be sure to rig up a spring. It wont take a great deal of spring tension to close the butterfly, but a spring is needed. \\ | ||
| - | If the cable is that shot, replace it. But if just the ends are frayed, you can solder them together with electronics solder. ((Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=596371)) \\ | + | If the cable is that shot, replace it. But if just the ends are frayed, you can solder them together with electronics solder. ((Monte03 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/81181-bendix-carb?t=596371)) \\ |
| - | Start by cleaning it with alcohol (cleans great and leaves no residue). ((wickit of the XLFORUM http://xlforum.net/forums/showthread.php?t=596371&page=3)) \\ | + | Start by cleaning it with alcohol (cleans great and leaves no residue). ((wickit of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/81181-bendix-carb/page3?t=596371&page=3)) \\ |
| After this if it is frayed get some small wire (30 AWG). Use this to wrap the end of your cable so all of the strands are contacting each other. \\ | After this if it is frayed get some small wire (30 AWG). Use this to wrap the end of your cable so all of the strands are contacting each other. \\ | ||
| (gets rid of the birdcage look). Apply flux, add heat and solder. \\ | (gets rid of the birdcage look). Apply flux, add heat and solder. \\ | ||
| When the solder flows into the strands remove the heat, let it cool and remove any excess solder with a file. \\ | When the solder flows into the strands remove the heat, let it cool and remove any excess solder with a file. \\ | ||
| - | {{:techtalk:ih:carb:bendix_carb_by_jdxlch.jpg?direct&300|}} ((photo by jdxlch of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639)) {{:techtalk:ih:carb:bendix_throttle_spring_by_russ_t_nail.jpg?direct&300|}} ((photo by Russ t nail of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=5)) \\ | + | {{:techtalk:ih:carb:bendix_carb_by_jdxlch.jpg?direct&300|}} ((photo by jdxlch of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch?t=1069639)) {{:techtalk:ih:carb:bendix_throttle_spring_by_russ_t_nail.jpg?direct&300|}} ((photo by Russ t nail of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page5?t=1069639&page=5)) \\ |
| Another option: \\ | Another option: \\ | ||
| - | {{:techtalk:ih:carb:bendix_throttle_cable_bracket_1_by_biged.jpg?direct&300|}} ((photo by biged of the XLFORUM http://xlforum.net/forums/showthread.php?t=757063)) {{:techtalk:ih:carb:bendix_throttle_cable_bracket_2_by_biged.jpg?direct&300|}} ((photo by biged of the XLFORUM http://xlforum.net/forums/showthread.php?t=757063)) \\ | + | {{:techtalk:ih:carb:bendix_throttle_cable_bracket_1_by_biged.jpg?direct&300|}} ((photo by biged of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/92443-bendix-zenith-carburetor?t=757063)) {{:techtalk:ih:carb:bendix_throttle_cable_bracket_2_by_biged.jpg?direct&300|}} ((photo by biged of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/92443-bendix-zenith-carburetor?t=757063)) \\ |
| - | Below, the existing bracket was modified. With two crescent wrenches and a rat tail file, the hole was enlarged almost to the end of the support. ((jdxlch of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=2))\\ | + | Below, the existing bracket was modified. With two crescent wrenches and a rat tail file, the hole was enlarged almost to the end of the support. ((jdxlch of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page2?t=1069639&page=2))\\ |
| Make sure to get it out far enough to clear the throttle shaft cam. The bracket was put in a vise and to bend the very end up and in to about 45°. \\ | Make sure to get it out far enough to clear the throttle shaft cam. The bracket was put in a vise and to bend the very end up and in to about 45°. \\ | ||
| Using the two crescents, one on each side of the cable sleeve, it and just rolled it back. \\ | Using the two crescents, one on each side of the cable sleeve, it and just rolled it back. \\ | ||
| Line 154: | Line 150: | ||
| You may have to tweek it a bit to get the straightest throw for the cable. \\ | You may have to tweek it a bit to get the straightest throw for the cable. \\ | ||
| - | {{:techtalk:ih:carb:bendix_throttle_cable_mod_1_by_jdxlch.jpg?direct&300|}} ((photo by jdxlch of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=2)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_2_by_jdxlch.jpg?direct&300|}} ((photo by jdxlch of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=2)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_3_by_jdxlch.jpg?direct&210|}} ((photo by jdxlch of the XLFORUM http://xlforum.net/forums/showthread.php?t=1069639&page=2)) \\ | + | {{:techtalk:ih:carb:bendix_throttle_cable_mod_1_by_jdxlch.jpg?direct&300|}} ((photo by jdxlch of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page2?t=1069639&page=2)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_2_by_jdxlch.jpg?direct&300|}} ((photo by jdxlch of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page2?t=1069639&page=2)) {{:techtalk:ih:carb:bendix_throttle_cable_mod_3_by_jdxlch.jpg?direct&210|}} ((photo by jdxlch of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112815-bendix-throttle-cable-mounting-74xlch/page2?t=1069639&page=2)) \\ |
| The single set screw on this cable assembly has nothing but the cable to tighten against. \\ | The single set screw on this cable assembly has nothing but the cable to tighten against. \\ | ||
| Line 165: | Line 161: | ||
| This allowed the set screw to tighten solid against something hard with the cable in between (same as a double set screw). \\ | This allowed the set screw to tighten solid against something hard with the cable in between (same as a double set screw). \\ | ||
| The dowel is on the bottom side and the set screw is on top side in the pic below. \\ | The dowel is on the bottom side and the set screw is on top side in the pic below. \\ | ||
| - | {{:techtalk:ih:carb:throttle_cable_mod_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1480481&page=2)) \\ | + | {{:techtalk:ih:carb:throttle_cable_mod_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136431-the-final-install-of-the-mikuni-with-enclosed-cable/page2?t=1480481&page=2)) \\ |
| ===== Carb / A/C Brace ===== | ===== Carb / A/C Brace ===== | ||
| - | + | The weight of the air filter is irrelevant. All models need an air filter support. ((ryder rick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195791-bendix-zenith-questions/page2?t=2072203&page=2)) \\ | |
| - | The weight of the air filter is irrelevant. All models need an air filter support. ((ryder rick of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072203&page=2)) \\ | + | |
| The manifold to head joints were never intended to support anything, and do a poor job of it. \\ | The manifold to head joints were never intended to support anything, and do a poor job of it. \\ | ||
| All bikes came from the factory with a support, the later bikes have 2. \\ | All bikes came from the factory with a support, the later bikes have 2. \\ | ||
| **NOTE**: \\ | **NOTE**: \\ | ||
| There are some aftermarket supports that pick up a carb mounting bolt but they don't hold up the air filter and they act as a teeter totter. \\ | There are some aftermarket supports that pick up a carb mounting bolt but they don't hold up the air filter and they act as a teeter totter. \\ | ||
| - | |||
| The simple way to add the needed support of the carb is to use a metal brace from the A/c backing plate to the front intake lifter bolt stud at the bottom. \\ | The simple way to add the needed support of the carb is to use a metal brace from the A/c backing plate to the front intake lifter bolt stud at the bottom. \\ | ||
| Line 184: | Line 178: | ||
| This is commercial carb brace. The angle was slightly modified on this one to fit. \\ | This is commercial carb brace. The angle was slightly modified on this one to fit. \\ | ||
| - | {{:techtalk:ref:carb:mounting_vm-38_pic_8_by_ironmick.jpg?direct&400|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1576003)) {{:techtalk:ref:carb:vm-38_project_16_by_ironmick.jpg?direct&250|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) \\ | + | {{:techtalk:ref:carb:mounting_vm-38_pic_8_by_ironmick.jpg?direct&400|}} ((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-1957-1985/145196-i-love-my-mikuni-vm38-9-because?t=1576003)) {{:techtalk:ref:carb:vm-38_project_16_by_ironmick.jpg?direct&250|}} ((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-1957-1985/144559-first-startup-w-mikuni-vm38-9/page2?t=1567528&page=2)) \\ |
| This one is made from an 1/8"x3/4" stainless steel strap. It has an aluminum spacer block between the backing plate and the brace at the top.\\ | This one is made from an 1/8"x3/4" stainless steel strap. It has an aluminum spacer block between the backing plate and the brace at the top.\\ | ||
| - | {{:techtalk:ref:carb:vm-38_pic_5_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1206745&page=2)) {{:techtalk:ih:carb:mounting_a_bendix_2_by_piniongear.jpg?direct&150|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1206745&page=2)) \\ | + | {{:techtalk:ref:carb:vm-38_pic_5_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122578-mikuni-vm38-3-jets/page2?t=1206745&page=2)) {{:techtalk:ih:carb:mounting_a_bendix_2_by_piniongear.jpg?direct&150|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122578-mikuni-vm38-3-jets/page2?t=1206745&page=2)) \\ |
| - | + | ||
| ====== Tuning ====== | ====== Tuning ====== | ||
| \\ | \\ | ||
| ===== Stock Bendix (fixed jet) Tuning ===== | ===== Stock Bendix (fixed jet) Tuning ===== | ||
| - | |||
| Before making any adjustments, bring the engine up to operating temperature. ((1970-1978 HD FSM pg 3-66)) \\ | Before making any adjustments, bring the engine up to operating temperature. ((1970-1978 HD FSM pg 3-66)) \\ | ||
| Make sure the air filter is clean and that there is no leaks in the carb to manifold connection. \\ | Make sure the air filter is clean and that there is no leaks in the carb to manifold connection. \\ | ||
| Line 224: | Line 215: | ||
| ===== Aftermarket Bendix (adjustable main jet) Tuning ===== | ===== Aftermarket Bendix (adjustable main jet) Tuning ===== | ||
| - | One advantage of using an adjustable main is being able to tune without removing the carb. ((DirtyHarry68 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072203&page=2)) \\ | + | One advantage of using an adjustable main is being able to tune without removing the carb. ((DirtyHarry68 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195791-bendix-zenith-questions/page2?t=2072203&page=2)) \\ |
| The float bowl won’t come off without removing the carb when running a magneto. | The float bowl won’t come off without removing the carb when running a magneto. | ||
| - | Instructions per the "C194-19 Zenith Model 16p12 Installation Sheet (with adjustable main jet)". ((instructions provided by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1294700)) \\ | + | Instructions per the "C194-19 Zenith Model 16p12 Installation Sheet (with adjustable main jet)". ((instructions provided by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/126883-setting-the-bendix?t=1294700)) \\ |
| As a replacement for Keihin or older Bendix, Tillotson carbs: | As a replacement for Keihin or older Bendix, Tillotson carbs: | ||
| Line 238: | Line 229: | ||
| If using the chrome plated 40mm carb (014052); | If using the chrome plated 40mm carb (014052); | ||
| * There is an overflow tube included with the kit. \\ The overflow tube should run away from the exhaust to the front of the bike. \\ You can use the existing overflow tube setup (if equipped) but check for cracks and holes in it. | * There is an overflow tube included with the kit. \\ The overflow tube should run away from the exhaust to the front of the bike. \\ You can use the existing overflow tube setup (if equipped) but check for cracks and holes in it. | ||
| - | * A new choke cable bracket and cable/knob assembly for installation on 86-87 Sportsters (available in the c182-1387 accessory kit). \\ Be sure to install the choke cable with the choke in the open or normal running position. \\ When your sure of operaton, cut the excess wire off the end of the cable. | + | * A new choke cable bracket and cable/knob assembly for installation on 1986-1987 Sportsters (available in the c182-1387 accessory kit). \\ Be sure to install the choke cable with the choke in the open or normal running position. \\ When your sure of operaton, cut the excess wire off the end of the cable. |
| * You may need a set of spacers to install the stock air cleaner on 86-87 models. They are included in the accessory kit. \\ Air cleaner screws should be tightened in sequence, alternating each screw until completely tightened. | * You may need a set of spacers to install the stock air cleaner on 86-87 models. They are included in the accessory kit. \\ Air cleaner screws should be tightened in sequence, alternating each screw until completely tightened. | ||
| - | * If using the chrome plated 40mm carb (014052) on 1340cc engines; \\ Yyou may need a jet discharge tube (c66-184-2) added to eliminate a lean condition even with the main jet in the full open position. | + | * If using the chrome plated 40mm carb (014052) on 1340cc engines; \\ You may need a jet discharge tube (c66-184-2) added to eliminate a lean condition even with the main jet in the full open position. |
| **Initial carb settings**: \\ | **Initial carb settings**: \\ | ||
| Line 246: | Line 237: | ||
| - Start the engine and check for leaks. \\ Adjust the idle mixture screw until you obtain the highest and smoothest possible idle. \\ Adjust the overall idle speed with the idle stop screw on the throttle lever. | - Start the engine and check for leaks. \\ Adjust the idle mixture screw until you obtain the highest and smoothest possible idle. \\ Adjust the overall idle speed with the idle stop screw on the throttle lever. | ||
| - With the idle speed and mixture adjusted, high speed mixture can be adjusted by running the engine up thru first or second gear to 4500 RPM or above. \\ Overly rich mixture responds by breaking up or running roughly at high RPM. \\ To lean out the main jet, turn the main jet adjustment needle in app. 1/2 turn at a time until the engine responds by pulling cleanly through high RPM ranges in 1st or 2nd gear. | - With the idle speed and mixture adjusted, high speed mixture can be adjusted by running the engine up thru first or second gear to 4500 RPM or above. \\ Overly rich mixture responds by breaking up or running roughly at high RPM. \\ To lean out the main jet, turn the main jet adjustment needle in app. 1/2 turn at a time until the engine responds by pulling cleanly through high RPM ranges in 1st or 2nd gear. | ||
| - | * Also be aware that the spring for the main gets bound (fully compressed) before the needle seats. ((Matt397 of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=989898)) The adjustment (4 turns takes this into account). | + | * Also be aware that the spring for the main gets bound (fully compressed) before the needle seats. ((Matt397 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/108084-zenith-bendix-adj-main-jet-rebuild-tuning?threadid=989898)) The adjustment (4 turns takes this into account). |
| - | * However, the only way (short of a dyno) to tell is to run the bike to redline in top gear. You can't tune a main jet while the bike is on the side stand. ((Ferrous Head of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071986)) | + | * However, the only way (short of a dyno) to tell is to run the bike to redline in top gear. You can't tune a main jet while the bike is on the side stand. ((Ferrous Head of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195607-bendix-carb-questions-identication?t=2071986)) |
| - | * Jump on the bike and ride it down the road in first or second gear and run it up to about 3/4 throttle. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=989898)) \\ If the engine blubbers, turn in the main jet needle in until it clears out. | + | * Jump on the bike and ride it down the road in first or second gear and run it up to about 3/4 throttle. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/108084-zenith-bendix-adj-main-jet-rebuild-tuning?threadid=989898)) \\ If the engine blubbers, turn in the main jet needle in until it clears out. |
| * If it does not clear, do another run but turn the needle out until it clears. \\ At the point that the engine suddenly runs smoothly and pulls strong you have successfully adjusted the high speed correctly. | * If it does not clear, do another run but turn the needle out until it clears. \\ At the point that the engine suddenly runs smoothly and pulls strong you have successfully adjusted the high speed correctly. | ||
| Line 257: | Line 248: | ||
| - | {{:techtalk:ih:carb:bendix_carb_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1434945)) {{:techtalk:ih:carb:bendix_carb_-labeled-_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?p=3891740)) \\ | + | {{:techtalk:ih:carb:bendix_carb_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/133538-amf-carb-help?t=1434945)) {{:techtalk:ih:carb:bendix_carb_-labeled-_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/124028-sitting-for-20-years/page3#post2851691)) \\ |
| Line 264: | Line 255: | ||
| Also notice that this particular bowl has no drain plug like the one shown in the factory manual. \\ | Also notice that this particular bowl has no drain plug like the one shown in the factory manual. \\ | ||
| - | The spring is .640" long and a tad longer than 5/8" with 6 coils. ((piniongear of the http://xlforum.net/forums/showthread.php?threadid=989898)) \\ | + | The spring is .640" long and a tad longer than 5/8" with 6 coils. ((piniongear of the https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/108084-zenith-bendix-adj-main-jet-rebuild-tuning?threadid=989898)) \\ |
| You can get a suitable spring at a hardware store and cut (grind it) to the correct length if you are missing one on a used carb. \\ | You can get a suitable spring at a hardware store and cut (grind it) to the correct length if you are missing one on a used carb. \\ | ||
| - | {{:techtalk:ih:carb:bendix_pic_4_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showpost.php?p=3171560&postcount=16)) {{:techtalk:ih:carb:bendix_pic_5_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showpost.php?p=3171560&postcount=16)) {{:techtalk:ih:carb:bendix_pic_8_by_piniongear.jpg?direct&270|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=941501&page=3)) \\ | + | {{:techtalk:ih:carb:bendix_pic_4_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112695-bendix-rebuilt-and-installed-but-troubles/page2?postcount=16#post2368179)) {{:techtalk:ih:carb:bendix_pic_5_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112695-bendix-rebuilt-and-installed-but-troubles/page2?postcount=16#post2368179)) {{:techtalk:ih:carb:bendix_pic_8_by_piniongear.jpg?direct&270|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/105564-rebuilded-bendix-now-it-s-flooding/page3?threadid=941501&page=3)) \\ |
| ====== Troubleshooting ====== | ====== Troubleshooting ====== | ||
| ==== Flooding ==== | ==== Flooding ==== | ||
| - | |||
| Excess fuel should be coming out of the hole in the pic below and the cause is either a too high float level or a stuck / blocked float needle failing to seat. \\ | Excess fuel should be coming out of the hole in the pic below and the cause is either a too high float level or a stuck / blocked float needle failing to seat. \\ | ||
| * Check the float level setting and adjust to 3/16 inch if needed. \\ If it pukes fuel after you set the float correctly, then just buy a new float needle and it will come with a new seat. \\ Replace both of these and you should have no more fuel puking. | * Check the float level setting and adjust to 3/16 inch if needed. \\ If it pukes fuel after you set the float correctly, then just buy a new float needle and it will come with a new seat. \\ Replace both of these and you should have no more fuel puking. | ||
| * When you install the float bowl back on you will have to take the end of the float spring and wrap it upwards as you install the bowl. \\ This end of the spring has to be inside the bowl and resting against the wall of the bowl. | * When you install the float bowl back on you will have to take the end of the float spring and wrap it upwards as you install the bowl. \\ This end of the spring has to be inside the bowl and resting against the wall of the bowl. | ||
| * No need to put the carb back on the engine yet. \\ Just hook up the gas line from the tank and holding the carb level turn on the petcock. \\ If the needle is seating, no excess fuel should come out the overflow. \\ If it does, tap the side of the bowl with a wrench to dis-lodge the needle. \\ If that does not stop the flow, then you need to buy the kit and replace the needle and seat which come as a matched set. | * No need to put the carb back on the engine yet. \\ Just hook up the gas line from the tank and holding the carb level turn on the petcock. \\ If the needle is seating, no excess fuel should come out the overflow. \\ If it does, tap the side of the bowl with a wrench to dis-lodge the needle. \\ If that does not stop the flow, then you need to buy the kit and replace the needle and seat which come as a matched set. | ||
| - | * Some of the rebuild kits have the wrong size needle, it is too big. Compare it to the old one to see if they are different. ((joestuff of the XLFORUM http://xlforum.net/forums/showthread.php?t=261311)) | + | * Some of the rebuild kits have the wrong size needle, it is too big. Compare it to the old one to see if they are different. ((joestuff of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/54403-bendix-carb-leaking-out-of-ideas?t=261311)) |
| * Also check the needle seat for dried varnish or debris, out of round or damaged, | * Also check the needle seat for dried varnish or debris, out of round or damaged, | ||
| * Make sure the float is moving free and easy, with no sticking. It should take no force whatsoever to move the float up and down. | * Make sure the float is moving free and easy, with no sticking. It should take no force whatsoever to move the float up and down. | ||
| Line 287: | Line 276: | ||
| The only gasket you will find is the one on the float bowl. The right pic below shows what the gasket looks like with the float removed. \\ | The only gasket you will find is the one on the float bowl. The right pic below shows what the gasket looks like with the float removed. \\ | ||
| - | {{:techtalk:ih:carb:bendix_pic_1_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?postid=4188583)) {{:techtalk:ih:carb:bendix_pic_2_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?postid=4188583)) {{:techtalk:ih:carb:bench_testing_bendix_float_by_dirtyharry68.jpg?direct&250|}} ((photo by DirtyHarry68 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072203&page=6)) \\ | + | {{:techtalk:ih:carb:bendix_pic_1_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/143391-stock-carburetor-problems-1974-xlch?postid=4188583#post3054769)) {{:techtalk:ih:carb:bendix_pic_2_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/143391-stock-carburetor-problems-1974-xlch?postid=4188583#post3054769)) {{:techtalk:ih:carb:bench_testing_bendix_float_by_dirtyharry68.jpg?direct&250|}} ((photo by DirtyHarry68 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/195791-bendix-zenith-questions/page6?t=2072203&page=6)) \\ |
| ==== Running Rich ==== | ==== Running Rich ==== | ||
| - | |||
| Running super rich and fouling the plugs even at highway speed. \\ | Running super rich and fouling the plugs even at highway speed. \\ | ||
| The bike would start up easy and after about 20 miles down the road, the plugs would foul. \\ | The bike would start up easy and after about 20 miles down the road, the plugs would foul. \\ | ||
| Line 300: | Line 288: | ||
| With a 10 pack of #5 O-rings ($1.29) from the hardware store plumbing department, the carb was fixed. \\ | With a 10 pack of #5 O-rings ($1.29) from the hardware store plumbing department, the carb was fixed. \\ | ||
| - | Sometimes when you push the main jet into the body attaching the bowl, the O-ring rubs on the threads of the body and can "clip" a piece out of the O-ring. ((shovithead of the XLFORUM http://xlforum.net/forums/showthread.php?t=941501&page=6)) \\ | + | Sometimes when you push the main jet into the body attaching the bowl, the O-ring rubs on the threads of the body and can "clip" a piece out of the O-ring. ((shovithead of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/105564-rebuilded-bendix-now-it-s-flooding/page6?t=941501&page=6)) \\ |
| You can use dielectric grease to lubricate them, and they slide right in. \\ | You can use dielectric grease to lubricate them, and they slide right in. \\ | ||
| If it clips the O-ring, the main jet will allow the fuel to bleed into the throat causing flooding, hard to make idle, and almost impossible to increase the rpms. \\ | If it clips the O-ring, the main jet will allow the fuel to bleed into the throat causing flooding, hard to make idle, and almost impossible to increase the rpms. \\ | ||
| Line 306: | Line 294: | ||
| On the needle valve clip, if you run them towards the air cleaner, they seem to work better and not hang up, but i always clip mine a shade shorter, so they won't spin and get tangled up in the float. | On the needle valve clip, if you run them towards the air cleaner, they seem to work better and not hang up, but i always clip mine a shade shorter, so they won't spin and get tangled up in the float. | ||
| - | {{:techtalk:ih:carb:bendix_parts_1_by_brianbbs67.jpg?direct&300|}} ((photo by brianbbs67 of the XLFORUM http://xlforum.net/forums/showthread.php?s=7b8ab13b7c115b6569746f1c73e14531&p=4829528)) {{:techtalk:ih:carb:bendix_parts_2_by_brianbbs67.jpg?direct&300|}} ((photo by brianbbs67 of the XLFORUM http://xlforum.net/forums/showthread.php?s=7b8ab13b7c115b6569746f1c73e14531&p=4829528)) | + | {{:techtalk:ih:carb:bendix_parts_1_by_brianbbs67.jpg?direct&300|}} ((photo by brianbbs67 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164664-zenith-bendix-explode-and-redo?s=7b8ab13b7c115b6569746f1c73e14531#post3508649)) {{:techtalk:ih:carb:bendix_parts_2_by_brianbbs67.jpg?direct&300|}} ((photo by brianbbs67 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164664-zenith-bendix-explode-and-redo?s=7b8ab13b7c115b6569746f1c73e14531#post3508649)) |
| - | {{:techtalk:ih:carb:bad_bendix_main_jet_oring_by_piniongear.jpg?direct&250|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=937320)) \\ | + | {{:techtalk:ih:carb:bad_bendix_main_jet_oring_by_piniongear.jpg?direct&250|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/105339-bendix-zenith-experience?t=937320)) \\ |
| ==== High throttle on startup ==== | ==== High throttle on startup ==== | ||
| - | |||
| Look at the throttle butterfly when you begin to start it. \\ | Look at the throttle butterfly when you begin to start it. \\ | ||
| - | The butterfly should be tight against the idle screw when the throttle is rolled off. There is no way the revs can be high if the throttle is closed. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1068009&page=3)) | + | The butterfly should be tight against the idle screw when the throttle is rolled off. There is no way the revs can be high if the throttle is closed. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112695-bendix-rebuilt-and-installed-but-troubles/page3?t=1068009&page=3)) |
| \\ | \\ | ||
| There is nothing in the carb or anything that you could do (or fail to do) with reassembly other than install the throttle butterfly upside down. \\ | There is nothing in the carb or anything that you could do (or fail to do) with reassembly other than install the throttle butterfly upside down. \\ | ||
| Line 322: | Line 309: | ||
| With the lever in this position you can look into the carb and the butterfly should be firmly closed. \\ | With the lever in this position you can look into the carb and the butterfly should be firmly closed. \\ | ||
| If not, ease up on the cable tension to allow the throttle plate to fully close. \\ | If not, ease up on the cable tension to allow the throttle plate to fully close. \\ | ||
| - | {{:techtalk:ih:carb:bendix_pic_6_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1068009&page=3)) \\ | + | {{:techtalk:ih:carb:bendix_pic_6_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112695-bendix-rebuilt-and-installed-but-troubles/page3?t=1068009&page=3)) \\ |
| ====== Bendix / Zenith Manuals and Other Helpful Links ====== | ====== Bendix / Zenith Manuals and Other Helpful Links ====== | ||
