Magneto-to-Engine External Timing
Magneto-to-Engine External Timing Adjustment (1) Make sure the ignition is in the OFF position. (2) Remove the engine cowl . (3) Remove a minimum of one spark plug from each cylinder. (4) Turn the propeller in the normal direction of movement until each impulse coupling releases as the number one cylinder moves near TDC on the compression stroke. NOTE: You will hear a click sound from the impulse couplings when they release. (5) Turn the propeller in the opposite direction of normal movement to approximately 30 degrees BTDC on the number one cylinder compression stroke. (6) Make sure that cylinder number one is at 25 degrees BTDC on the compression stroke. (7) Connect a standard aircraft magneto timing light between a acceptable engine ground and the P lead terminal of the magneto. NOTE: Most standard aircraft magneto timing lights show open points with a Light On condition and/or a signal that you can hear. (8) Loosen the mount cla...