Refer to either Fig. 5F-1 or 5F-1B corresponding to single or double circuit breaker.

Remove spark plugs to permit engine to turn easily. Remove screw plug from timing inspection hole in left side of crankcase. Telescope front push rod cover so that opening and closing of valve can be ob served. Remove circuit breaker cover and set circuit breaker point gap as described in "Adjusting Circuit Breaker Points."

Turn engine in direction in which it runs until front piston is on compression stroke (just after front intake valve closes), and continue turning engine very slowly (less than 1/2 revolution) until timing mark for front cylinder on flywheel is aligned in inspection hole, as shown in Fig. 5F-3. Make sure timing mark (8) on circuit breaker base aligns with end of timing adjusting plate (10).

Rotate circuit breaker head counterclockwise against stop (fully advanced position).

Timing mark (3) on cam lobe should now align with circuit breaker arm fiber cam follower (2). If it does not, but is only slightly out of alignment, loosen timing adjusting stud lock nut (9) and shift circuit breaker head to attain alignment. Timing mark (8) will no longer line up exactly with edge of plate (10). Be sure to securely retighten lock nut. Remember that circuit breaker must be fully advanced when checking alignment of timing mark with fiber cam follower.

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