Single Contact Point Circuit Breaker

Use a test lamp to determine when point contacts open as follows: Connect one test lamp wire to coil wire (12, Fig. 5F-2) at spark coil terminal. Connect the other test lamp wire to the battery positive terminal. Ground battery negative terminal to engine. With points closed, lamp will light, and points open, lamp will be out.

With circuit breaker fully advanced against its stop and flywheel marks correctly positioned as shown in Fig. 5F-3, contact points should just begin to open, "light off." The instant direction is reversed (spark retarded) from full advance stop position, points should begin to close, "light on."

If the contact points remain closed, "light on", in the fully advanced position, timing is late. Loosen adjusting stud lock nut (9, Fig. 5F-1) and shift circuit breaker base counterclockwise until contact points just begin to open (timing light just flickers or goes off) in fully advanced position.

If the contact points begin to open, "light off", before circuit breaker is in fully advanced position, timing is early. Loosen adjusting stud lock nut (9, Fig. 5F-1) and shift circuit breaker base clockwise until contact points just begin to open, "light off", in fully advanced position.

Retighten lock nut (9) then move circuit breaker from retard to advance to see that points will just open when the circuit breaker reaches the advance stop. Be sure to keep flywheel mark correctly positioned during the entire procedure.

NOTE: Timing ignition for front cylinder automatically times ignition for rear cylinder.

CHECKING TIMING. Install circuit breaker cover (1, Fig. 5F-2), turn engine in direction in which it runs until front piston is on compression stroke. Continue to turn engine very slowly until points just begin to open, "light off." Flywheel mark should be correctly located in inspection hole as shown in Fig. 5F-3.

If timing mark is forward of correct position as shown in Fig. 5F-3, timing is late. If timing mark is to the rear of correct position as shown in Fig. 5F-3, timing is early. In either case, re-adjust timing as previously described.

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