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techtalk:ih:carb01 [2017/11/26 14:48] hippysmack [Late 1976-Early 1978] |
techtalk:ih:carb01 [2019/05/20 05:13] hippysmack [Keihin non-CV Carb (Late 1976-1987)] |
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| ^Carb Model^HD Bike Used On^Idle Bleed^Idle Tube Feed^Fixed Jet^Throttle Disc^Turns (high speed setting)^Turns (idle speed setting)^ | ^Carb Model^HD Bike Used On^Idle Bleed^Idle Tube Feed^Fixed Jet^Throttle Disc^Turns (high speed setting)^Turns (idle speed setting)^ | ||
| |(27155-57) was the first Sportster carburetor then replaced with (27155-57A) both introduced for 1957-1959 Sportsters ((1952-1959 HD Spare Parts Catalog pg 16))|||||||| | |(27155-57) was the first Sportster carburetor then replaced with (27155-57A) both introduced for 1957-1959 Sportsters ((1952-1959 HD Spare Parts Catalog pg 16))|||||||| | ||
| - | |DC-1|1957-1958 Sportster XL Early Style ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#9 .067|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 3/4" to 1" ((HD 1959-1964 Sportster FSM))| | + | |DC-1|1957-1958 Sportster XL Early Style ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#9 .067|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 3/4" to 1" ((HD 1959-1964 Sportster FSM))| |
| - | |DC-1L|1959-1960 Sportster XL ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html)) |#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))| | + | |DC-1L|1959-1960 Sportster XL ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html)) |#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))| |
| - | |DC-1M|1959-1960 Sportster XL ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#1 .052|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 1" ((HD 1959-1964 Sportster FSM))| | + | |DC-1M|1959-1960 Sportster XL ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#1 .052|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 1" ((HD 1959-1964 Sportster FSM))| |
| - | |DC-2|1959-65 Servicar (smaller venturi, opposite float bowl)((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#51 .067|#70 .028|#20 .0452|12 ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))| | + | |DC-2|1959-65 Servicar (smaller venturi, opposite float bowl)((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#51 .067|#70 .028|#20 .0452|12 ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))| |
| - | |DC-6|1961 Sportster XLH and XLCH ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | | + | |DC-6|1961 Sportster XLH and XLCH ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2)) | |
| - | |DC-7|1966 Big-Twin FL and FLH (larger venturi) ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293| .070|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2))| | + | |DC-7|1966 Big-Twin FL and FLH (larger venturi) ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293| .070|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2))| |
| - | |DC-10|1962 and mid-63 Sportster XLH and XLCH ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=691253&highlight=Linkert&page=2))| 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))| | + | |DC-10|1962 and mid-63 Sportster XLH and XLCH ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?t=691253&highlight=Linkert&page=2))| 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))| |
| - | |DC-12|1966 Big-Twin FL and FLH \\ mid-1963 1964 1965 Sportster XLH and XLCH ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?=691253&highlight=Linkert&page=2))| | + | |DC-12|1966 Big-Twin FL and FLH \\ mid-1963 1964 1965 Sportster XLH and XLCH ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://xlforum.net/forums/showthread.php?=691253&highlight=Linkert&page=2))| |
| Line 102: | Line 102: | ||
| </blockquote> | </blockquote> | ||
| * The FSM may be of little use from this point on. | * The FSM may be of little use from this point on. | ||
| - | * Its trial and error now to find out what works for you. Idle speed is critical in easy starting. Low idle can make bikes difficult to start and too high is uncomfortable at stops. There is a sweet spot in there somewhere that you must find. 1200 rpm is a good speed to begin your fine tuning. ((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * Its trial and error now to find out what works for you. Idle speed is critical in easy starting. Low idle can make bikes difficult to start and too high is uncomfortable at stops. There is a sweet spot in there somewhere that you must find. 1200 rpm is a good speed to begin your fine tuning. ((DR DICK of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * When it's warm and it's been off for a minute. I only need to push the kicker through and it starts up. If it's been off for a bit, the first kick without retarding the mag results in a locked up kicker, feeling there is a fuel charge sitting in the combustion chamber. The idle adjustment screw can be backed out as far as I want and it doesn't change much at all. If I go too lean, it will stumble of course. If the idle adj. screw is 1/8th out from stumble as the manual suggests, I have a hard time with starting. ((Zaemo of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * When it's warm and it's been off for a minute. I only need to push the kicker through and it starts up. If it's been off for a bit, the first kick without retarding the mag results in a locked up kicker, feeling there is a fuel charge sitting in the combustion chamber. The idle adjustment screw can be backed out as far as I want and it doesn't change much at all. If I go too lean, it will stumble of course. If the idle adj. screw is 1/8th out from stumble as the manual suggests, I have a hard time with starting. ((Zaemo of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * The bigger picture regarding these adjustments for this the throttle plate must be: Positioned (milled notch up & facing air cleaner) and registered (even peripheral contact to throttle body at fully closed) correctly.((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * The bigger picture regarding these adjustments for this the throttle plate must be: Positioned (milled notch up & facing air cleaner) and registered (even peripheral contact to throttle body at fully closed) correctly.((DR DICK of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * Removing the brass screw plug near idle mix screw exposes the idle well. On the side wall of the well you will see a hole that feeds mixture (note that I didn't say fuel) to the idle mix screw. Mixture that enters this hole is regulated by the adjuster screw, and discharged into air stream thru a hole drilled close to intake manifold. This supplies most of the idle mixture.((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * Removing the brass screw plug near idle mix screw exposes the idle well. On the side wall of the well you will see a hole that feeds mixture (note that I didn't say fuel) to the idle mix screw. Mixture that enters this hole is regulated by the adjuster screw, and discharged into air stream thru a hole drilled close to intake manifold. This supplies most of the idle mixture.((DR DICK of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * Then on floor of the well you will see a series of 4 tiny holes. These are the transition holes. The remainder of idle mixture comes from the 1st (one closest to manifold) transition hole as its open to low manifold pressure. The other 3 are open to the higher atmospheric pressure because they are on the other side of throttle plate at idle. That means lots of air enters the well thru the 3 hi pressure holes. All that air dilutes the fuel into a 'mixture'. Because the idle mix screw adjusts the flow of this mixture a funny thing happens as you richen it. Because the air component is so much less dense than the fuel component the mix screw is less a restriction to the air than to the fuel- its gets to a point where opening it adds more air then it does fuel. In other words it will only get so rich no matter how far you back it out. This is a DC Linkert anomaly because 4 holes spread over a very large throttle plate swing bleed a lot of air into the well on idle. Things change as soon as you begin opening throttle plate. Now the number of transition holes open to low pressure is larger and the number open to atmospheric pressure is less. ie: the air component of the mixture drops. Now the idle mix screw is controlling a more fuel laden mixture. The ratio of air to fuel continuously drops as you open the throttle until the last holes is on downstream of the plate. The mix screw will have a larger effect on low throttle running than idling. You need to set screw where you get good around town manners and then adjust the speed screw to the appropriate speed.((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * Then on floor of the well you will see a series of 4 tiny holes. These are the transition holes. The remainder of idle mixture comes from the 1st (one closest to manifold) transition hole as its open to low manifold pressure. The other 3 are open to the higher atmospheric pressure because they are on the other side of throttle plate at idle. That means lots of air enters the well thru the 3 hi pressure holes. All that air dilutes the fuel into a 'mixture'. Because the idle mix screw adjusts the flow of this mixture a funny thing happens as you richen it. Because the air component is so much less dense than the fuel component the mix screw is less a restriction to the air than to the fuel- its gets to a point where opening it adds more air then it does fuel. In other words it will only get so rich no matter how far you back it out. This is a DC Linkert anomaly because 4 holes spread over a very large throttle plate swing bleed a lot of air into the well on idle. Things change as soon as you begin opening throttle plate. Now the number of transition holes open to low pressure is larger and the number open to atmospheric pressure is less. ie: the air component of the mixture drops. Now the idle mix screw is controlling a more fuel laden mixture. The ratio of air to fuel continuously drops as you open the throttle until the last holes is on downstream of the plate. The mix screw will have a larger effect on low throttle running than idling. You need to set screw where you get good around town manners and then adjust the speed screw to the appropriate speed.((DR DICK of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * This is a delicate balancing act that will change as the properties of the air change: temperature, pressure (altitude or barometer), and water content (humidity). The dc is prone to this fickleness due to the large air bleed variation at different throttle plate positions.((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * This is a delicate balancing act that will change as the properties of the air change: temperature, pressure (altitude or barometer), and water content (humidity). The dc is prone to this fickleness due to the large air bleed variation at different throttle plate positions.((DR DICK of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * The S&S carbs based on the DC Linkert used only two transition holes in the early years and three later on. Both show a marked improvement in weather stability.((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showpost.php?p=5287605&postcount=31)) | + | * The S&S carbs based on the DC Linkert used only two transition holes in the early years and three later on. Both show a marked improvement in weather stability.((DR DICK of the XLFORUM http://xlforum.net/forums/showpost.php?p=5287605&postcount=31)) |
| - | * These carbs are extremely touchy to float level at just off idle throttle positions. Problems show as spitting / coughing on one end of the spectrum to burbiling / stumbling at the other end. Many owners will report how precise you need to be with float levels to get your bike to run as a fine watch.These guys also eventually learn two things:((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1993187&highlight=linkert)) | + | * These carbs are extremely touchy to float level at just off idle throttle positions. Problems show as spitting / coughing on one end of the spectrum to burbiling / stumbling at the other end. Many owners will report how precise you need to be with float levels to get your bike to run as a fine watch.These guys also eventually learn two things:((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1993187&highlight=linkert)) |
| - | - Float levels will rise on their own due to the steel inlet needle wearing the brass seat away. This is a mileage thing-- just like tire and chain wear (steel needle carbs only- linkert, orig earlies and orignal L's). ((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1993187&highlight=linkert)) | + | - Float levels will rise on their own due to the steel inlet needle wearing the brass seat away. This is a mileage thing-- just like tire and chain wear (steel needle carbs only- linkert, orig earlies and orignal L's). ((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1993187&highlight=linkert)) |
| - | - Secondly and more importantly, these carbs are very susceptible to errant low speed metering as fuel composition, barometric pressure, humidity, and air temperature vary. Trying to hit the sweet spot requires many float adjustments, idle mixture settings, idle speed settings and road tests. To do away with that wasted time and aggravation, I fit all my side bowl carbs with an externally adjustable float level. Now I can change float level on a whim.((DR DICK of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1993187&highlight=linkert)) | + | - Secondly and more importantly, these carbs are very susceptible to errant low speed metering as fuel composition, barometric pressure, humidity, and air temperature vary. Trying to hit the sweet spot requires many float adjustments, idle mixture settings, idle speed settings and road tests. To do away with that wasted time and aggravation, I fit all my side bowl carbs with an externally adjustable float level. Now I can change float level on a whim.((DR DICK of the XLFORUM http://xlforum.net/forums/showthread.php?t=1993187&highlight=linkert)) |
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| ==== Linkert DC Pics ==== | ==== Linkert DC Pics ==== | ||
| |{{techtalk:ih:carb:linkert_dc-11_by_xlh59.jpg?direct&300|}}|{{techtalk:ih:carb:linkert_dc-11_by_xlh59_2.jpg?direct&300|}}| | |{{techtalk:ih:carb:linkert_dc-11_by_xlh59.jpg?direct&300|}}|{{techtalk:ih:carb:linkert_dc-11_by_xlh59_2.jpg?direct&300|}}| | ||
| - | | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1914726&page=2)) | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1914726&page=2)) | | + | | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1914726&page=2)) | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1914726&page=2)) | |
| |{{techtalk:ih:carb:linkert_dc-11_by_xlh59_3.jpg?direct&300|}}|{{techtalk:ih:carb:linkert_dc-11_by_xlh59_4.jpg?direct&300|}}| | |{{techtalk:ih:carb:linkert_dc-11_by_xlh59_3.jpg?direct&300|}}|{{techtalk:ih:carb:linkert_dc-11_by_xlh59_4.jpg?direct&300|}}| | ||
| - | | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1914726&page=2)) | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1914726&page=2)) |((Photos courtesy of The Doctor71 of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1914726&page=2)) | + | | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1914726&page=2)) | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1914726&page=2)) |((Photos courtesy of The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1914726&page=2)) |
| ==== Linkert DC Mods ==== | ==== Linkert DC Mods ==== | ||
| | | ||
| - | |{{techtalk:ih:carb:linkert_dc_linkage_mod_by_the_french_owl.jpg?direct&300|}} \\ Linkage modified for usage with "snap" throttle ((photo courtesy of thefrenchowl of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1993187&highlight=linkert))| | + | |{{techtalk:ih:carb:linkert_dc_linkage_mod_by_the_french_owl.jpg?direct&300|}} \\ Linkage modified for usage with "snap" throttle ((photo courtesy of thefrenchowl of the XLFORUM http://xlforum.net/forums/showthread.php?t=1993187&highlight=linkert))| |
| Line 170: | Line 170: | ||
| * Intake Manifold (27021-57) ((HD Sportster Parts Catalog (99451-78B) )) | * Intake Manifold (27021-57) ((HD Sportster Parts Catalog (99451-78B) )) | ||
| | | ||
| - | | **HD-1A** was the 66 version, no pump check ball, used the no drill insulator and the "wraparound" cable bracket is the same as the 67-71. 66 uses the Linkert bracket ((Dr Dick of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1567534&page=4)) \\ Fuel pressure and the weight of the needle alone move the needle away from the inlet seat. ((HD Service Bulletin #547 dated October 24th, 1966 pg OC-237))| | + | | **HD-1A** was the 66 version, no pump check ball, used the no drill insulator and the "wraparound" cable bracket is the same as the 67-71. 66 uses the Linkert bracket ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567534&page=4)) \\ Fuel pressure and the weight of the needle alone move the needle away from the inlet seat. ((HD Service Bulletin #547 dated October 24th, 1966 pg OC-237))| |
| - | |**HD-1B ** Starting after engine #66XLCH-10611, the carb has a new inlet valve lever, needle and seat assembly to help correct problems such as high speed leaning out caused by vibration and needle sticking due to dirt / debris in carburetor. The stamped ID has the model stamped on the flange near the idle mixture adjustment wheel. \\ The new lever had a forked end which engaged a groove in the new inlet needle seat stem which locked the lever to the needle providing diaphragm control of the needle movement in both directions. \\ It was recommended to install this update into the HD-1A carb (where definite carburetor problems exist) ((HD Service Bulletin #547 dated October 24th, 1966 pg OC-237)) \\ 67-E68 used the 'standard' choke and throttle shafts, no pump check, insulator gets drilled for over the top. Same pn. This insulator gets used on e67CH, 70-71CH and 67-71 XLH. \\ 67-69 CH gets its own insulator. New pn for this one. Same part as others, this vintage except the lower stud is now longer for the plug wire router to mount.((Dr Dick of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1567534&page=4))| | + | |**HD-1B ** Starting after engine #66XLCH-10611, the carb has a new inlet valve lever, needle and seat assembly to help correct problems such as high speed leaning out caused by vibration and needle sticking due to dirt / debris in carburetor. The stamped ID has the model stamped on the flange near the idle mixture adjustment wheel. \\ The new lever had a forked end which engaged a groove in the new inlet needle seat stem which locked the lever to the needle providing diaphragm control of the needle movement in both directions. \\ It was recommended to install this update into the HD-1A carb (where definite carburetor problems exist) ((HD Service Bulletin #547 dated October 24th, 1966 pg OC-237)) \\ 67-E68 used the 'standard' choke and throttle shafts, no pump check, insulator gets drilled for over the top. Same pn. This insulator gets used on e67CH, 70-71CH and 67-71 XLH. \\ 67-69 CH gets its own insulator. New pn for this one. Same part as others, this vintage except the lower stud is now longer for the plug wire router to mount.((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567534&page=4))| |
| - | |**HD-1BC** or **HD-1C** Late 1968 Sportsters ( Carb # 27162-66B) received a ball check valve in the accelerating pump passage of the plastic cover which provides a seal against air bleeding back from the venturi into the fuel chamber. ((Shop Dope Vol 4 Service Bulletin No 571 May 21, 1968)). \\ L68-69 HD1C gets the pump check.((Dr Dick of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1567534&page=4)) \\ 70-71 HD1D different body casting. may be different low speed circuit.((Dr Dick of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1567534&page=4))| | + | |**HD-1BC** or **HD-1C** Late 1968 Sportsters ( Carb # 27162-66B) received a ball check valve in the accelerating pump passage of the plastic cover which provides a seal against air bleeding back from the venturi into the fuel chamber. ((Shop Dope Vol 4 Service Bulletin No 571 May 21, 1968)). \\ L68-69 HD1C gets the pump check.((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567534&page=4)) \\ 70-71 HD1D different body casting. may be different low speed circuit.((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567534&page=4))| |
| |**HD-2A** \\ **HD-2AB** \\ **HD-2B**|Electra Glide models ((HD Service Bulletin #547 dated October 24th, 1966 pg OC-237)) \\ w / pre lever needle and seat assembly| | |**HD-2A** \\ **HD-2AB** \\ **HD-2B**|Electra Glide models ((HD Service Bulletin #547 dated October 24th, 1966 pg OC-237)) \\ w / pre lever needle and seat assembly| | ||
| Line 208: | Line 208: | ||
| |{{techtalk:ih:carb:tillotson_carb_5_by_the_doctor71_of_the_xlforum.jpg?direct&300|}}| {{techtalk:ih:carb:tillotson_air_cleaner_backing_cover_by_the_doctor71_of_the_xlforum.jpg?direct&300|}}|{{:techtalk:ih:carb:66_tillotson_1_by_dr_dick.jpg?direct&300|}}| | |{{techtalk:ih:carb:tillotson_carb_5_by_the_doctor71_of_the_xlforum.jpg?direct&300|}}| {{techtalk:ih:carb:tillotson_air_cleaner_backing_cover_by_the_doctor71_of_the_xlforum.jpg?direct&300|}}|{{:techtalk:ih:carb:66_tillotson_1_by_dr_dick.jpg?direct&300|}}| | ||
| - | |Tillotson Carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Tillotson Air Cleaner Backing Plate ((Pic courtesy of The Doctor71 of the XLFORUM))|Notes on the 66 throttle shaft:((photo by Dr Dick of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1567534&page=4))| | + | |Tillotson Carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Tillotson Air Cleaner Backing Plate ((Pic courtesy of The Doctor71 of the XLFORUM))|Notes on the 66 throttle shaft:((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567534&page=4))| |
| |{{:techtalk:ih:carb:66_tillotson_2_by_dr_dick.jpg?direct&300|}}| | |{{:techtalk:ih:carb:66_tillotson_2_by_dr_dick.jpg?direct&300|}}| | ||
| - | |The 66 only choke shaft.:((photo by Dr Dick of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1567534&page=4))| | + | |The 66 only choke shaft.:((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567534&page=4))| |
| ===== Parts and Services for your Tillotson Carb ===== | ===== Parts and Services for your Tillotson Carb ===== | ||
| Line 235: | Line 235: | ||
| **1972-1980** | **1972-1980** | ||
| - | Through 1980, XR-750 engines were equipped with a 36mm Round Slide((http://xlforum.net/vbportal/forums/showthread.php?t=2006195&page=3)) Mikuni. Below is a chart of the standard jetting of these carbs. Final jetting may vary. ((1972-2003 HD XR-750 Service Manua pg 39)) | + | Through 1980, XR-750 engines were equipped with a 36mm Round Slide((http://xlforum.net/forums/showthread.php?t=2006195&page=3)) Mikuni. Below is a chart of the standard jetting of these carbs. Final jetting may vary. ((1972-2003 HD XR-750 Service Manua pg 39)) |
| |36mm Carb Types|Main|Pilot|Needle|Needle Jet|Slide|Air Correction Jet| | |36mm Carb Types|Main|Pilot|Needle|Needle Jet|Slide|Air Correction Jet| | ||
| Line 248: | Line 248: | ||
| - | * Most Mikuni carbs have a backwards Idle mix screw, in to richen, out to lean. ((ryder rick from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?postid=5514564#post5514564)) | + | * Most Mikuni carbs have a backwards Idle mix screw, in to richen, out to lean. ((ryder rick from the XLFORUM http://xlforum.net/forums/showthread.php?postid=5514564#post5514564)) |
| - | * The longer carb provides a better signal to the fuel metering business inside. This is why the round slide carb works so well combined with the taper on the slide and needle. The round slide carb will have a wider sweet spot than a flat slide ((ryder rick http://xlforum.net/vbportal/forums/showthread.php?threadid=2006195)) and that equates to better low range. ((big_sleezy http://xlforum.net/vbportal/forums/showthread.php?t=2006195&page=2)) | + | * The longer carb provides a better signal to the fuel metering business inside. This is why the round slide carb works so well combined with the taper on the slide and needle. The round slide carb will have a wider sweet spot than a flat slide ((ryder rick http://xlforum.net/forums/showthread.php?threadid=2006195)) and that equates to better low range. ((big_sleezy http://xlforum.net/forums/showthread.php?t=2006195&page=2)) |
| Line 255: | Line 255: | ||
| |38mm Carb Types|Main|Pilot|Needle Jet|Throttle Valve|Jet Needle|Air Jet| | |38mm Carb Types|Main|Pilot|Needle Jet|Throttle Valve|Jet Needle|Air Jet| | ||
| - | |VM38-9 (43mm spigot)((IronMick http://xlforum.net/vbportal/forums/showthread.php?t=2006195&page=2))|330|30|Q-2|2.5|6DP1|0.5| | + | |VM38-9 (43mm spigot)((IronMick http://xlforum.net/forums/showthread.php?t=2006195&page=2))|330|30|Q-2|2.5|6DP1|0.5| |
| ---- | ---- | ||
| Line 282: | Line 282: | ||
| | | ||
| ^Year Model XLH/ XLCH^Serial Number^Main Jet Sizes (mm)^Low Speed Idle Jet^^ | ^Year Model XLH/ XLCH^Serial Number^Main Jet Sizes (mm)^Low Speed Idle Jet^^ | ||
| - | |1972-Early 1975|27155-72 ((http://xlforum.net/vbportal/forums/showthread.php?t=1981918))|0.90mm|Part #(27749-72) (( HD Sportster Parts Catalog pg 27 (99451-78B) ))|| | + | |1972-Early 1975|27155-72 ((http://xlforum.net/forums/showthread.php?t=1981918))|0.90mm|Part #(27749-72) (( HD Sportster Parts Catalog pg 27 (99451-78B) ))|| |
| - | |1972-Early 1975|27155-72A ((http://xlforum.net/vbportal/forums/showthread.php?t=1981918))|'72-early '75 (0.95), '72-74 (1.00,1.05, 1.10, 1.15, 1.20, 1.25mm)|Late '72-'74 Part #(27750-72)(( HD Sportster Parts Catalog pg 28 (99451-78B) ))|| | + | |1972-Early 1975|27155-72A ((http://xlforum.net/forums/showthread.php?t=1981918))|'72-early '75 (0.95), '72-74 (1.00,1.05, 1.10, 1.15, 1.20, 1.25mm)|Late '72-'74 Part #(27750-72)(( HD Sportster Parts Catalog pg 28 (99451-78B) ))|| |
| |1975-Early 1976 \\ (also used on '71-'75 FX models)((1971-1984 HD FX Parts Catalog pg 35))| 27155-72B(( HD Sportster Parts Catalog (99451-78B) ))|0.95, 1.00,1.05, 1.10, 1.15, 1.20 mm (( HD Sportster Parts Catalog pg 27 (99451-78B) ))||| | |1975-Early 1976 \\ (also used on '71-'75 FX models)((1971-1984 HD FX Parts Catalog pg 35))| 27155-72B(( HD Sportster Parts Catalog (99451-78B) ))|0.95, 1.00,1.05, 1.10, 1.15, 1.20 mm (( HD Sportster Parts Catalog pg 27 (99451-78B) ))||| | ||
| ^ Bendix Main Jet Identification ((Shop Dope Service Bulletin #697 dated March 29, 1976)) ^^^^^ | ^ Bendix Main Jet Identification ((Shop Dope Service Bulletin #697 dated March 29, 1976)) ^^^^^ | ||
| Line 314: | Line 314: | ||
| ===== Keihin non-CV Carb (Late 1976-1987) ===== | ===== Keihin non-CV Carb (Late 1976-1987) ===== | ||
| + | * . . . [[techtalk:ih:carb01a|The Keihin BH Carburetor]] | ||
| + | |||
| + | |||
| * The Keihin non-CV carburetor is a horizontal type with a fuel bowl, single ring-shaped float, an accelerating pump, idle mixture adjusting needle and a throttle stop screw for speed adjustment. ((1970-1978 HD XL/XLH/XLCH/XLT 1000 FSM)) | * The Keihin non-CV carburetor is a horizontal type with a fuel bowl, single ring-shaped float, an accelerating pump, idle mixture adjusting needle and a throttle stop screw for speed adjustment. ((1970-1978 HD XL/XLH/XLCH/XLT 1000 FSM)) | ||
| * The throttle body casting contains an integral venture and a fuel valve seat that is pressed into the body. The underside of the throttle body contains a boss. The main jet screws into the boss and holds the bleed tube in place.((1970-1978 HD XL/XLH/XLCH/XLT 1000 FSM)) | * The throttle body casting contains an integral venture and a fuel valve seat that is pressed into the body. The underside of the throttle body contains a boss. The main jet screws into the boss and holds the bleed tube in place.((1970-1978 HD XL/XLH/XLCH/XLT 1000 FSM)) | ||
| Line 322: | Line 325: | ||
| * **The Choke System**: The choke is manually set by pulling out on the choke button. Pulled all the way out is fully closed (for cold engine), partially open (for warm engine) or pushed all the way in, fully open (for warm engine). ((1970-1978 HD XL/XLH/XLCH/XLT 1000 FSM)) | * **The Choke System**: The choke is manually set by pulling out on the choke button. Pulled all the way out is fully closed (for cold engine), partially open (for warm engine) or pushed all the way in, fully open (for warm engine). ((1970-1978 HD XL/XLH/XLCH/XLT 1000 FSM)) | ||
| * **Additional Tips** on usage: | * **Additional Tips** on usage: | ||
| - | * Make sure the low speed and main jets are larger than stock to match the more free-flowing aftermarket exhausts and air filters we all seem to run. ((Hopper of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?threadid=659533)) | + | * Make sure the low speed and main jets are larger than stock to match the more free-flowing aftermarket exhausts and air filters we all seem to run. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=659533)) |
| - | * Do not run a worn out ignition auto advance unit. It makes carb farts that you would swear were lean low speed mixture.((Hopper of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?threadid=659533)) | + | * Do not run a worn out ignition auto advance unit. It makes carb farts that you would swear were lean low speed mixture.((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=659533)) |
| * Integral Float Chamber | * Integral Float Chamber | ||
| * Manual Choke | * Manual Choke | ||
| Line 330: | Line 333: | ||
| * **Tuning** | * **Tuning** | ||
| * The usual method to set idle mixture/speed is: | * The usual method to set idle mixture/speed is: | ||
| - | * First: Set idle MIXTURE screw to 7/8 turns out. Get the bike hot. Set idle at comfortable speed with the idle SPEED screw. ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * First: Set idle MIXTURE screw to 7/8 turns out. Get the bike hot. Set idle at comfortable speed with the idle SPEED screw. ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| - | * Second: Adjust the idle MIXTURE screw to the point where engine runs the fastest. This is optimum mixture. ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * Second: Adjust the idle MIXTURE screw to the point where engine runs the fastest. This is optimum mixture. ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| - | * Third: Adjust idle SPEED screw again to get desired idle speed. ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * Third: Adjust idle SPEED screw again to get desired idle speed. ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| - | * The spring on the idle speed screw tends to creep the idle speed back up if you try to adjust the idle just that little bit slower. So I adjust the idle speed screw right down too slow, then nudge it up slightly faster until I get the speed I want, then it stays there. ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * The spring on the idle speed screw tends to creep the idle speed back up if you try to adjust the idle just that little bit slower. So I adjust the idle speed screw right down too slow, then nudge it up slightly faster until I get the speed I want, then it stays there. ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| - | * If your bike idles best with the idle mixture screw less than ½ turn open, you need a smaller low speed fixed jet. ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * If your bike idles best with the idle mixture screw less than ½ turn open, you need a smaller low speed fixed jet. ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| * If your bike idles best with the idle mixture screw more than 1-1/4 turns open, you need a larger low speed fixed jet. | * If your bike idles best with the idle mixture screw more than 1-1/4 turns open, you need a larger low speed fixed jet. | ||
| * This is real important. It also is the way to stop “carb farts” – spitting back or backfiring through the carb. | * This is real important. It also is the way to stop “carb farts” – spitting back or backfiring through the carb. | ||
| - | * If your Ironhead has aftermarket free-flow exhaust and airfilter on it, it will almost certainly need a larger low speed fixed jet, and most likely a bigger main jet too. But it is the low speed jet that affects the dreaded carb farts. Main jet affects mixture at wide open throttle and if left lean can overheat the engine, or burn holes in pistons. ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * If your Ironhead has aftermarket free-flow exhaust and airfilter on it, it will almost certainly need a larger low speed fixed jet, and most likely a bigger main jet too. But it is the low speed jet that affects the dreaded carb farts. Main jet affects mixture at wide open throttle and if left lean can overheat the engine, or burn holes in pistons. ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| ==== Late 1976-Early 1978 ==== | ==== Late 1976-Early 1978 ==== | ||
| * Features: | * Features: | ||
| - | * 38mm venture ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * 38mm venture ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| * Pump adjusting screw | * Pump adjusting screw | ||
| * Idle mixture Screw | * Idle mixture Screw | ||
| Line 355: | Line 358: | ||
| * Features/ Upgrades: | * Features/ Upgrades: | ||
| - | * Changed to 34 mm venture ((Hopper http://xlforum.net/vbportal/forums/showthread.php?t=276157&page=2)) | + | * Changed to 34 mm venture ((Hopper http://xlforum.net/forums/showthread.php?t=276157&page=2)) |
| * Fast idle cam screw | * Fast idle cam screw | ||
| * Limiter Cap (over idle mixture )-late 1978-1979 | * Limiter Cap (over idle mixture )-late 1978-1979 | ||
| Line 411: | Line 414: | ||
| |{{techtalk:ih:carb:hoppers_77_keihin_carb_pic_1.jpg?direct&300|}} |{{techtalk:ih:carb:hoppers_77_keihin_carb_pic_2.jpg?direct&300|}} | | |{{techtalk:ih:carb:hoppers_77_keihin_carb_pic_1.jpg?direct&300|}} |{{techtalk:ih:carb:hoppers_77_keihin_carb_pic_2.jpg?direct&300|}} | | ||
| - | |1977 Keihin 38mm non-CV pic 1((Hopper from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=247853))|1977 Keihin 38mm non-CV pic 2((Hopper from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=247853))| | + | |1977 Keihin 38mm non-CV pic 1((Hopper from the XLFORUM http://xlforum.net/forums/showthread.php?t=247853))|1977 Keihin 38mm non-CV pic 2((Hopper from the XLFORUM http://xlforum.net/forums/showthread.php?t=247853))| |
| ---- | ---- | ||
