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techtalk:ih:engctl01 [2023/12/30 03:28] – hippysmacktechtalk:ih:engctl01 [2025/07/28 22:58] (current) – [Nosecone Ignition Seal] 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)).
 +
  
 ===== Magnavox Electronic Ignition Systems ===== ===== Magnavox Electronic Ignition Systems =====
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 ===== Spark Coil ===== ===== Spark Coil =====
 +
 +**Coil Spec for Points Ignition**
 +  * Resistances on a Points-based Ignition Coil should be:
 +    * Primary: 4.7-5.5 Ohms
 +    * Secondary: 16,000-20,000 Ohms
 +
  
 **Coil Mix-up on 1973-1974 Models** **Coil Mix-up on 1973-1974 Models**
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 **Failed Coils on 1980 Models** **Failed Coils on 1980 Models**
  
-  * A quantity of ignition coils (31609-80) used on all 1980 models, failed at low mileage. The problem was an internal breakdown of the windings within the coil. This is a failure that could lead to poor vehicle performance and a possible fouled spark plug. ((HD Service Bulletin #M-793 dated July 3, 1980))+  * A quantity of ignition coils (31609-80) used on all 1980 models (electronic ignition system), failed at low mileage. The problem was an internal breakdown of the windings within the coil. This is a failure that could lead to poor vehicle performance and a possible fouled spark plug. ((HD Service Bulletin #M-793 dated July 3, 1980))
   * Upon inspection of an ignition related failure, follow the diagnostic procedure outlined in the service manual. Inspect the primary and secondary coil resistance with an ohmmeter.   * Upon inspection of an ignition related failure, follow the diagnostic procedure outlined in the service manual. Inspect the primary and secondary coil resistance with an ohmmeter.
-  * Resistances should be:+  * Resistances on an Electronic Ignition Coil should be:
     * Primary: 3.3-3.7 Ohms     * Primary: 3.3-3.7 Ohms
     * Secondary: 16500-19500 Ohms     * Secondary: 16500-19500 Ohms

Trace: • IH: Engine Control