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techtalk:ih:engctl01 [2019/03/28 04:29]
ixl2relax [Ignition Module - Timeout]
techtalk:ih:engctl01 [2020/05/03 14:17] (current)
ixl2relax [Timing Advance]
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 ====== Timing ====== ====== Timing ======
 ===== Sub-Documents ===== ===== Sub-Documents =====
-* . . . [[techtalk:​ih:​engctl01e|Why timing advance changed from 45°- 40° in 1972]]+* . . . [[techtalk:​ih:​engctl01e|Why timing advance changed from 45°- 40° in 1972]] ​(commentary from Dr Dick) \\
  
-* . . . [[techtalk:​ih:​engctl01f|Revised timing marks starting with 1980 models]] 
  
 ===== Ignition Timing and Related Specs ===== ===== Ignition Timing and Related Specs =====
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 ==== Timing Advance ==== ==== Timing Advance ====
-^  ​^Ign. Advance^Ign. Retard ((57-69 HD Sportster FSM pg 3A-11)) ((70-78 HD Sportster FSM pg 3-1)) ((79-85 HD Sportster FSM pg 3-3))^ +^  ^Ign. Retard ((57-69 HD Sportster FSM pg 3A-11)) ((70-78 HD Sportster FSM pg 3-1)) ((79-85 HD Sportster FSM pg 3-3))^Ign. Advance
-|**57-71**|45° (11/16” BTDC)|15° (5/​64"​) BTDC)|  +|**57-70**|15° (5/​64"​) ​BTDC)|45° (11/​16” ​BTDC)|  
-|**72-79**|40° (17/32” BTDC)|10° (1/32”BTDC)|+|**71-72**|10° (1/32”BTDC)|40° (17/32” BTDC)|
  
 ^  ^Ign. Retard^Idle Advance^Full Advance ((79-85 HD Sportster FSM pg 3-3))^ ^  ^Ign. Retard^Idle Advance^Full Advance ((79-85 HD Sportster FSM pg 3-3))^
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 ===== Timing Marks ===== ===== Timing Marks =====
  
-Clean the timing ​mark on the flywheel ​and apply a paint color that will stand out when viewing it with timing ​light. ((DirtyCory ​of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1793084)) \\ +**The timing ​marks on the flywheel ​are NOT used for timing the cams**. \\ 
-You can spray some brake cleaner ​on a Q-tip to clean the timing ​mark. \\ +Below are the timing marks on factory built engines. \\ 
-Paint the timing mark with bright pink fingernail polish ​(or something florescent). \\ +**However, don't trust any timing marks on flywheels till you have physically confirmed ​that (TDC.. is indeed TDC).** ((fdny37 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1427992)) \\ 
-Install ​the clear plug into the timing hole. \\ +Over the course of the last 30, 40 and even 50 plus years, these engines could have had multiple makeovers by previous owners. \\ 
-It should be very near but not touching the flywheel. (go in till you touch the wheel and back off a 1/8-1/4 turn).+Numerous modifications to the flywheels have been done or even been replaced ​with aftermarket wheels. \\  
 +The TDC marks as well as advance ​timing ​marks should be determined before trusting any marks on any flywheels that you didn't install yourself\\ 
 + 
 +**'​Factory built' engines and there respective flywheel markings**:​ 
 +  * 57-70 Sportster engines: ​((Dr Dick of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1427992)) 
 +    * The single straight line is 45° BTDC front cylinder (factory advanced ignition timing setting). 
 +    * The double straight lines are 15° BTDC front cylinder (used to set retarded kick start timing). 
 +    * The dot is TDC front cylinder (not used for any ignition settings). ​\\ The dot is NOT rear cylinder advanced timing like on AMF big twin models. 
 + 
 +  * 71-E80 Sportster engines: \\ 
 +    * The single straight line is 40° BTDC (original factory advanced ignition timing setting). 
 +    * The dot is TDC front cylinder. 
 +    * The double dots are for rear advanced timing. 
 + 
 +  * L80-85 Sportster engines: \\ The timing marks have been revised ​on all 1980 and later 1000cc (crankcase number 780-108-001 and up) and 1340cc models. \\ This was done to enable ​the timing ​to be set electronically at the factory. \\ This step was to reduce ​the number of timing adjustments required during pre-delivery and set-up. \\ The procedure used to set the timing is exactly the same. Only the timing marks have changed. \\ The front cylinder advance ​timing mark has changed from a straight line to a 1/8" dot and the rear cylinder advanced timing mark now represented by a lazy eight. 
 +    * The single dot is 40° BTDC front cylinder ​(factory advanced ignition timing setting). 
 +    * The straight line is TDC front cylinder. 
 +    * A lazy eight (2 side by side dots) are for rear cylinder advanced timing. {{:​techtalk:​ih:​engctl:​lazy_eight_icon.jpg?​direct&​50|}} 
 + 
 +**57-E80 flywheel marks**: ​\\ 
 +{{:​techtalk:​ih:​engctl:​timing_mark_1_by_finkrod67_annotated_by_hippysmack.jpg?​direct&​300|}} ((photo by FinkRod67 of the XLFORUM annotated by Hippysmack http://​xlforum.net/​forums/​showthread.php?​t=1427992)) {{:​techtalk:​ih:​engctl:​timing_mark_2_by_finkrod67_annotated_by_hippysmack.jpg?​direct&​300|}} ((photo by FinkRod67 of the XLFORUM annotated by Hippysmack http://​xlforum.net/​forums/​showthread.php?​t=1427992)) {{:​techtalk:​ih:​engctl:​timing_mark_3_by_finkrod67_annotated_by_hippysmack.jpg?​direct&​300|}} ((photo by FinkRod67 of the XLFORUM annotated by Hippysmack http://​xlforum.net/​forums/​showthread.php?​t=1427992)) ​\\ 
 + 
 +**L80-85 ​flywheel ​marks**: \\ 
 +{{:​techtalk:​ih:​engctl:​timing_mark_1_by_yochstein_annotated_by_hippysmack.jpg?​direct&​300|}} ​((photo by Yochstein of the XLFORUM http://xlforum.net/​forums/​showthread.php?​t=2026846)) {{:​techtalk:​ih:​engctl:​timing_mark_2_by_yochstein_annotated_by_hippysmack.jpg?​direct&​300|}} ((photo by Yochstein of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2026846)) {{:​techtalk:​ih:​engctl:​timing_mark_3_by_yochstein_annotated_by_hippysmack.jpg?​direct&​300|}} ((photo by Yochstein of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2026846)) \\ 
  
 ===== Setting Ignition Timing ===== ===== Setting Ignition Timing =====
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   * Ignition timing should be checked every 2500 miles.   * Ignition timing should be checked every 2500 miles.
     * Use an Inductive Timing Light to view the advanced timing of the flywheel through the accessory plastic view plug (HD-96295-65) screwed into the timing inspection hole. Make sure the view plug does not touch the flywheels. Timing light leads should be connected to the front spark plug cable, ground and battery positive terminal. Make sure the vacuum hose is properly installed at the carburetor and at the VOES. Start the engine and set the engine speed at 1300 rpm. Light will flash each time spark occurs. Loosen the sensor plate screws just enough so that plate can be shifted using a screwdriver in the notch as the light (aimed into the inspection hole) stops the timing mark in the center of the hole.     * Use an Inductive Timing Light to view the advanced timing of the flywheel through the accessory plastic view plug (HD-96295-65) screwed into the timing inspection hole. Make sure the view plug does not touch the flywheels. Timing light leads should be connected to the front spark plug cable, ground and battery positive terminal. Make sure the vacuum hose is properly installed at the carburetor and at the VOES. Start the engine and set the engine speed at 1300 rpm. Light will flash each time spark occurs. Loosen the sensor plate screws just enough so that plate can be shifted using a screwdriver in the notch as the light (aimed into the inspection hole) stops the timing mark in the center of the hole.
 +
 +**Preparing the timing mark for using a timing light**: \\ 
 +Clean the timing mark on the flywheel and apply a paint color that will stand out when viewing it with a timing light. ((DirtyCory of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1793084)) \\
 +You can spray some brake cleaner on a Q-tip to clean the timing mark. \\
 +Paint the timing mark with bright pink fingernail polish (or something florescent). \\
 +Install the clear plug into the timing hole. \\
 +It should be very near but not touching the flywheel. (go in till you touch the wheel and back off a 1/8-1/4 turn).