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techtalk:ih:engctl01c [2018/09/17 15:09] hippysmack [Prestolite Electronic Ignition System] |
techtalk:ih:engctl01c [2023/12/31 17:57] (current) hippysmack |
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| **(1979)** Upgrade to the breaker point system in which the mechanical points are replaced by a breaker-less electronic ignition on the camshaft. Timer has a rotor with one small lobe and one large lobe and a sensor that sends signal to the control module on the back of the timer inner cover. Rotor is mounted on a mechanical flywheel centrifugal advance like a point cam would be in a breaker point system. The rotor's small lobe fires the front cylinder and the large lobe fires the rear cylinder. ((1959-1985 Clymer Sportster Repair Manual pg 225))1979 Ignition Module Assembly part number 32598-78 ((1979 HD Sportster Parts Catalog)). | **(1979)** Upgrade to the breaker point system in which the mechanical points are replaced by a breaker-less electronic ignition on the camshaft. Timer has a rotor with one small lobe and one large lobe and a sensor that sends signal to the control module on the back of the timer inner cover. Rotor is mounted on a mechanical flywheel centrifugal advance like a point cam would be in a breaker point system. The rotor's small lobe fires the front cylinder and the large lobe fires the rear cylinder. ((1959-1985 Clymer Sportster Repair Manual pg 225))1979 Ignition Module Assembly part number 32598-78 ((1979 HD Sportster Parts Catalog)). | ||
| - | |{{:techtalk:ih:engctl:prestolite_ignition_by_joshstrange2.jpg?direct&400|}} ((photo by joshstrange2 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1995856))| | + | {{:techtalk:ih:engctl:prestolite_ignition_by_joshstrange2.jpg?direct&400|}} ((photo by joshstrange2 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/186748-unknown-ignition?t=1995856)) |
| - | * **In November of 1978**, the MoCo issued a few recommendations to dealers to handle issues with the leaned out condition related to this new ignition system. Motorcycles operate with leaner air/fuel mixtures and are more sensitive to carburetor mixture settings / ignition spark. ((HD Service Bulletin #M-739 dated November 3, 1978)) | + | * **In November of 1978**, the MoCo issued a few recommendations to dealers to handle issues with the leaned out condition related to this new ignition system. Motorcycles operate with leaner air/fuel mixtures and are more sensitive to carburetor mixture settings / ignition spark. ((HD Service Bulletin #M-739 dated November 3, 1978)) |
| - | * This involves checking the [[techtalk:ih:carb02#lean_condition_adjustments_from_the_moco_1979|carburetor / manifold for leaks]] and insuring that the air cleaner backing plate has a tight connection. Corrective measures regarding the ignition on 1100, 1200 and 1340cc engines include: ((HD Service Bulletin #M-739 dated November 3, 1978)) | + | * This involves checking the carburetor / manifold for leaks and insuring that the air cleaner backing plate has a tight connection. Corrective measures regarding the ignition on 1100, 1200 and 1340cc engines include: ((HD Service Bulletin #M-739 dated November 3, 1978)) See also [[techtalk:ih:carb01r#running_lean|Running Lean]] in the Sportsterpedia. |
| * Checking that the spark plugs, cables, boots and wiring connections are in good condition. If irregular running or spitting persists after making previously suggested checks, the spark plug gap should be increased to .060". This has been found to improve engine combustion in some cases. ((HD Service Bulletin #M-739 dated November 3, 1978)) | * Checking that the spark plugs, cables, boots and wiring connections are in good condition. If irregular running or spitting persists after making previously suggested checks, the spark plug gap should be increased to .060". This has been found to improve engine combustion in some cases. ((HD Service Bulletin #M-739 dated November 3, 1978)) | ||
| * Make sure the ignition timer air gap is set as close as possible to the lower limit. Use a .004" feeler gauge to set clearance between the sensor and the trigger lobes per the FSM. Check both lobes to be sure they do not touch the sensor body. Review the FSM ignition section for other possible ignition system faults. ((HD Service Bulletin #M-739 dated November 3, 1978)) | * Make sure the ignition timer air gap is set as close as possible to the lower limit. Use a .004" feeler gauge to set clearance between the sensor and the trigger lobes per the FSM. Check both lobes to be sure they do not touch the sensor body. Review the FSM ignition section for other possible ignition system faults. ((HD Service Bulletin #M-739 dated November 3, 1978)) | ||
