FAIRBANKS MORSE FMX4B16 MAGNETO GEAR TIMING INFORMATION PAGE

When servicing the Fairbanks Morse FMX4B16 magneto the fiber gear is often removed. When replacing the fiber gear, the timing marks on the steel gear and the marks fiber gear must be aligned properly for correct engine ignition timing. There are normally two marks marked "C" for clockwise rotation (found on the Lincoln SA-200) and "A" for anti-clockwise engine rotation.

When timing the fiber gear and steel gear note the timing marks. There is "punch-mark" opposite the "flat" on the steel gear. That tooth mates to the #4 tooth notch, marked "C" on the timing gear.