Section XVIII
IGNITION SYSTEM
| Paragraph | |
|---|---|
| Description | [82] |
| Spark plugs | [83] |
| Circuit breaker points | [84] |
| Condenser | [85] |
| Circuit breaker and timer assembly | [86] |
| Coil to timer wire | [87] |
| Adjust spark control | [88] |
| Spark coil | [89] |
82. DESCRIPTION.
a. The ignition system differs from that of the conventional automotive types in that it has no distributor. A circuit breaker alone is used. Both coil high‐tension winding ends lead directly to both spark plugs. Thus both plugs spark at the same time, one cylinder being on compression stroke while the other cylinder is on exhaust stroke.
83. SPARK PLUGS.
a. Defective spark plugs are indicated by engine missing, overheating, knocking excessively, and lacking normal power.
b. Type. Spark plugs are medium heat range, manufacturer’s (H–D) No. 3.
c. Cleaning. Do not take plugs apart for cleaning. Use the sandblast cleaner method.
d. Point Adjustment. Bend electrode located in plug base to adjust point gap 0.025 inch to 0.030 inch.
e. Replacement. Use spark plug wrench (41–W–3334) to install plugs, using new gaskets. Never draw a cool plug up tight in a hot cylinder head, rather turn down snug and wait l/2 minute until plug base is warm: then tighten securely. CAUTION: Take care not to cross‐thread when installing spark plug.