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techtalk:evo:engctl01 [2019/08/06 13:27]
ixl2relax [Electronic Ignition Systems] 		techtalk:evo:engctl01 [2019/09/29 21:20]
ixl2relax [Electronic Ignition Systems]
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 **(1998 to 2003)**\\ **(1998 to 2003)**\\
-__The 1998-2003 Non-Sport model__ used an integrated ICM on the Sensor Plate which was still located in the '​nosecone'​ behind the round cover. These OEM modules had a high failure rate, apparently due to the high heat in their mounting location. The MoCo stopped providing replacement units as soon as they were allowed. The only current choice for replacement is aftermarket versions (such as the Ultima brand discussed [[techtalk:​ref:​engctl01#​ultima_-_nosecone_ignition|HERE]]).+__The 1998-2003 Non-Sport model__ used an integrated ICM on the Sensor Plate (which was still located in the '​nosecone'​ behind the round cover) and was still a Dual-Fire Spark System. 
 + 
 +These OEM modules had a high failure rate, apparently due to the high heat in their mounting location. The MoCo stopped providing replacement units as soon as they were allowed. The only current choice for replacement is aftermarket versions (such as the Ultima brand discussed [[techtalk:​ref:​engctl01#​ultima_-_nosecone_ignition|HERE]]).
  
 The ICM may fail with a number of different symptons, with some randomness. The bike may refuse to fire even though the starter will turn the engine over. Some riders report that flicking the RUN/STOP switch (which sends power to the ICM and the coil) several times will sometimes allow the bike to fire up. The ICM may also fail due to heat even though it fired up cold. In this case, once the engine cools down, the ICM may allow the engine to fire up again. This can be extremely frustrating as the bike will randomly stop while riding. Various other, less common, symptoms may occur from a failing nosecone ignition module (misfiring, backfiring, etc.). The ICM may fail with a number of different symptons, with some randomness. The bike may refuse to fire even though the starter will turn the engine over. Some riders report that flicking the RUN/STOP switch (which sends power to the ICM and the coil) several times will sometimes allow the bike to fire up. The ICM may also fail due to heat even though it fired up cold. In this case, once the engine cools down, the ICM may allow the engine to fire up again. This can be extremely frustrating as the bike will randomly stop while riding. Various other, less common, symptoms may occur from a failing nosecone ignition module (misfiring, backfiring, etc.).
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 | 1998-2003 1200Sport Model         |||| 32480-98A | ? | ???? | | 1998-2003 1200Sport Model         |||| 32480-98A | ? | ???? |
  
-{{:​techtalk:​evo:​engctl:​camsensorplate-icm-98-03-a.jpg?​450|}}+\\
  
 +{{:​techtalk:​evo:​engctl:​ignitionsystem-dual-single.jpg?​450|}} ​    ​{{:​techtalk:​evo:​engctl:​camsensorplate-icm-98-03-a.jpg?​450|}}
 \\ \\
  
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 ===== VOES - Vacuum-Operated Electric Switch ===== ===== VOES - Vacuum-Operated Electric Switch =====
 +===== Sub-Documents =====
 +  * [[techtalk:​evo:​elec01a|Dissecting the Voes]]
 +
 +----
 +
 +
   * The VOES was first installed on Sportsters in 1983 (and used on most models thru 2003). The unit senses intake manifold vacuum at the carburetor and requests that the Ignition Control Module (ICM) switches between one of two different spark advance curves. The switch is closed at high vacuum operation, utilizing a more advanced spark curve and it is open at low vacuum operation, utilizing a less advanced (retarded) spark curve to minimize engine knock and still maintain performance. The VOES is installed above the intake manifold. ((1959-1985 Clymer Sportster Repair Manual pg 230))   * The VOES was first installed on Sportsters in 1983 (and used on most models thru 2003). The unit senses intake manifold vacuum at the carburetor and requests that the Ignition Control Module (ICM) switches between one of two different spark advance curves. The switch is closed at high vacuum operation, utilizing a more advanced spark curve and it is open at low vacuum operation, utilizing a less advanced (retarded) spark curve to minimize engine knock and still maintain performance. The VOES is installed above the intake manifold. ((1959-1985 Clymer Sportster Repair Manual pg 230))
  
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 To set the timing **dynamically**,​ first, remove the timing plug & install the clear timing hole viewer plug (It MUST NOT touch the flywheel). Connect the clamp of an inductive pickup timing light (powered by the battery) to the front spark plug wire. This will allow you to 'shoot the light' into/thru the clear viewer plug. Then start the engine, set the idle at 1000rpms & shoot the light into the timing hole. Move the timing plate so that the 20° advance timing mark shows up in the center of the timing hole. To set the timing **dynamically**,​ first, remove the timing plug & install the clear timing hole viewer plug (It MUST NOT touch the flywheel). Connect the clamp of an inductive pickup timing light (powered by the battery) to the front spark plug wire. This will allow you to 'shoot the light' into/thru the clear viewer plug. Then start the engine, set the idle at 1000rpms & shoot the light into the timing hole. Move the timing plate so that the 20° advance timing mark shows up in the center of the timing hole.
  
-**Moving the Cam Sensor Plate Clockwise (CW) will increase the Advance Before TDC. Moving the plate Counterclockwise (CCW) will retard (or reduce) the Advance Before TDC. Note that each timing mark on the plate (long-to-short) is equal to changing the ignition timing by 5°. Move the plate __VERY LITTLE__ to make adjustments.**+{{:​techtalk:​evo:​engctl:​camsensorplate.jpg?​400|}} 
 + 
 +**Moving the Cam Sensor Plate Clockwise (CW) will increase the Advance Before TDC. Moving the plate Counterclockwise (CCW) will retard (or reduce) the Advance Before TDC. Note that each timing mark on the plate (long-to-short) is equal to changing the ignition timing by 5°. Move the plate __VERY LITTLE__ to make adjustments.** ​((aswracing post#17 at http://​xlforum.net/​forums/​showthread.php?​t=488663))
  
 The Cam Sensor Plate can be rotated slightly to accomodate getting the timing mark in the center of the timing hole. You can also move the plate to change the base timing (thus moving the whole curve sets up or down in rpm range) by setting the 1000rpm timing to a few degrees more or less than the specified (20° BTDC) advance timing mark. The Cam Sensor Plate can be rotated slightly to accomodate getting the timing mark in the center of the timing hole. You can also move the plate to change the base timing (thus moving the whole curve sets up or down in rpm range) by setting the 1000rpm timing to a few degrees more or less than the specified (20° BTDC) advance timing mark.

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