Jun/Jul 2008

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LOW TENSION MAGNETO TIMING

This is the second article on magnetoes which Bud Motry, 20201 Arthur Rd., Big Rapids, MI 49307, has written for our readers. The first, on Low Tension Magnetoes, appeared on pages 8 and 9 of the January-February issue of GEM.

The current flow and resulting spark to cause ignition of combustible gases in a cylinder was discussed in a a previous article on Low Tension Magnetos. This article will deal with valve and ignition timing, as both are closely related. In timing any engine, all gears in the gear train, from the crankshaft gear to the final gear that drives the push rod for the valve, or the gear that rotates the magneto, must be in time. The only exception is the governor gear which requires no timing. There are timing marks of some kind on all mated gears. They may be ground-off corners of two adjacent gears that mate with a ground-off tooth of another gear, as in most magneto internal gears. ...

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