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techtalk:ih:engctl01 [2019/03/28 04:29] ixl2relax [Ignition Module - Timeout] |
techtalk:ih:engctl01 [2019/12/05 01:51] hippysmack [Timing Marks] |
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| ===== Timing Marks ===== | ===== Timing Marks ===== | ||
| + | Below are the timing marks on factory built engines. \\ | ||
| + | **However, don't trust any timing marks on flywheels till you have physically confirmed that (TDC.. is indeed TDC).** \\ | ||
| + | Over the course of the last 30, 40 and even 50 plus years, these engines could have had multiple makeovers by previous owners. \\ | ||
| + | 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**: \\ | ||
| + | All 57-71 Sportster 900 engines: ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1427992)) \\ | ||
| + | The single line is 45° BTDC front cylinder (original factory advanced ignition timing setting). \\ | ||
| + | The double 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. The AMF sportsters used double dots for rear advanced timing. | ||
| + | |||
| + | 76-85 1000 engines: ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1427992)) \\ | ||
| + | The single mark is 40° BTDC (original factory advanced ignition timing setting). \\ | ||
| + | |||
| + | **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)) \\ | 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. \\ | You can spray some brake cleaner on a Q-tip to clean the timing mark. \\ | ||
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| Install the clear plug into the timing hole. \\ | 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). | 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). | ||
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| ===== Setting Ignition Timing ===== | ===== Setting Ignition Timing ===== | ||
