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Re: OT - Fairbanks Morse FM Magneto timing
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Posted by Glen in TX on November 07, 2005 at 10:13:04 from (65.249.225.109):
In Reply to: OT - Fairbanks Morse FM Magneto timing posted by Jason Z in MO on November 07, 2005 at 07:26:59:
Jason, Yes FM impulses are fixed and not adjustable. Make sure the mag isn't timed off one tooth or someone has placed more marks on your gear for timing. I've seen that happen. Original marks on gears were usually XXs and sometimes a dot or XXs on mag gear. Also cam timing could be off a tooth? Or just worn impulse or wrong one? You may also need to check your engine serial number with parts book at a dealer. I noticed one mag for the AKN in FM mag book was to use a 25 degree impulse for FM-XDE1B7D but it doesn't tell why. Only could tell which ones used that from a Wisconsin parts book. FM mag applications for all other AKN and early AK engines shows to use a CW, UC8, 30 degree impulse for the FM XD1B7 mag and other variations for AKN. After removing the drive cup, spring and hub assembly with pawls off the tapered shaft you should see 30 degrees stamped on the hub assembly. If you need to trade parts for correct one or need other mag info email me and I'll try to help. Glen
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