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Old 10-29-2010, 10:40 AM
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w8ye
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Default RE: Checking timing on a Saito 80

The exact center position of the valve overlap position where the rocker arm tops are parallel with each other is some 5 degrees before Top Dead Center.

However, the overlap event should cross over top dead center before completion.

I usually just find top dead center by feel and then open the carburetor and blow in the exhaust to find the limits of the cross over event. Half way in between the limits is the center where the rocker arm tops will be parallel with each other. This way, I do not have to take anything apart on the engine.

One tooth retarded and the center will be just past top dead center. This engine will have poor idle

One tooth advanced and the overlap event will be complete before top dead center. This engine will have poor top end power but a great idle.