A timing gauge is a good tool, but with it we locate the advance angle, say, 28 degree, at ZERO rpm.
It was supposed the spark to retard to 5 degrre BTDC at 2000 rpm and no retard above 5000. It is noted it doesn't happen but at 5000 the ignition use to retard about 5 degrre, so the spark go to 28 - 5 = 23 degrre BTDC so the need to advance 5 degree or set, with timing gauge, an advance of 33/34 degree BTDC to get an actual advance of 28 degree. This in noted in motorcycle ignition also.
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Last edited by PARDAL; 09-28-2014 at 06:14 PM.