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A/C B Help

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Greg Lasher

02-07-1999 13:48:50

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How do I time my early B (hand start) with a FM J4B3 mag? Where are the marks on the gears in the mag (the fiber gear behind the rotor and the steel gear on the mag shaft.) Are there marks on the crank pulley to indicate TDC #1? Should there be a pointer somewhere? ANY HELP IS GREATLY APPRECIATED! Post you response or send me a message at sharke@bellatlantic.net
Thanks Greg

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Gordon Chance

02-07-1999 18:51:52

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 Re: A/C B Help in reply to Greg Lasher, 02-07-1999 13:48:50  
Greg: The easiest way to time the rotor button to the mag if you can't find any timing marks on the fibre gear is to do the following. Turn the coupling on the magneto clockwise when looking at it until it comes against the impulse stop and hold it there. Turn the rotor button in the cap to the ten o'clock position and hold it there. This should be a little bit before it passes the #1 plug terminal. With the coupling and the rotor button in these positions assemble the cap to the magneto. After assembly turn the coupler until the impulse clicks off and watch to see that the rotor button passes by the plug terminal as it does. The magneto should be in time. To time the magneto to the engine, first remove #1 spark plug and turn the engine with the crank until you feel compression coming out of the plug hole. If the magneto drive gear has not been removed from the engine then watch the drive lugs as you turn the engine over. When you stop feeling air being pushed out of #1, stop and look at the drive lugs. They should be nearly parallel to the ground at this time. Turn the coupling on the magneto backwards until the rotor button is pointing at the #1 terminal. At this time the lugs on the coupling should be nearly parallel to the ground and you can mount the magneto to the engine. You should be close enough in time to start the engine and make any final timing adjustments by turning the magneto in its mount. I hope that this answers your questions and good luck. Gordon

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Ted Buisker

02-08-1999 04:10:45

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 Re: Re: A/C B Help in reply to Gordon Chance, 02-07-1999 18:51:52  
That was the best description of how to solve what, to me at least, can be a complicated process. I printed several copies to put in my shop manuals. Thanks Gordon. TED

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Gordon Chance

02-08-1999 14:44:07

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 Re: Re: Re: A/C B Help in reply to Ted Buisker, 02-08-1999 04:10:45  
Ted: You're welcome. Gordon

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