Refer to Fig. 5F-1A - Automatic Advance Circuit Breaker.

Follow same procedures as for manual advance circuit breaker, aligning advance timing mark (Fig.

5F-3A) in center of inspection hole according to model being worked on as shown. Note that cam must be turned clockwise with flyweights against stops, and held in this position while checking timing.

Timing mark (3) on top edge of circuit breaker cam (1) should align perfectly with breaker arm fiber cam follower (2). If it does not, shift circuit breaker head to attain alignment as follows:

1966 and later models have clamp (16) on circuit breaker stem to allow 360° adjustment range. Loosen clamp nut or bolts (15) and shift circuit breaker head (10) clockwise (retard) or counterclockwise (advance) to attain alignment. 1965 models have slotted holes in timer plate for base studs to allow limited adjustment. Loosen circuit breaker head nuts (9) and shift base on stem to attain alignment. Timing marks (8) will no longer exactly line up. Retighten nuts (9) securely, but care must be taken not to over tighten or breaker head base plate will distort and affect timing.

Circuit breaker cam must be fully advanced clockwise against stop when checking alignment of mark (3) with fiber cam follower (2).

Figure 5F-3A. Ignition Timing Schematic, Automatic Advance Circuit Breaker

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