4/10/2023 0 Comments Magneto timing light circuit![]() ![]() Typical engine timings are 20 to 25 BTDC (before top dead center). If this an engine you had built for you or built on your own, you’ll know the timing figure by heart if its a used engine or an engine in a used homebuilt, you’ll need to check the data plate and the logbooks. ![]() ![]() Generally, the magneto timing will be printed on the engines data plate, so look there first. 1 cylinder, which is the timing reference set the crankshaft at the position that corresponds with the desired timing and check that the mags are actually firing at that point, and together. The basic steps are: Determine the proper timing of the engine as expressed in degrees before piston top dead center (TDC) find the crankshaft position that corresponds to TDC on the No. (Setting the timing of an electronic ignition system uses some of these concepts but not all, so we’ll save that discussion for another time.) Photo 1. Assuming your engine came with the mags and installed and timed, you might not have had the chance to test and adjust magneto timing during your build. And you will need to, both before you fire up the engine for the first time and during your annual condition inspections. Ignition timing is a concept simply expressed but slightly complicated to measure.
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