by rayjb60 » Tue Sep 21, 2004 3:00 pm
That measurement .13-.17 inches is the distance from the top of the piston, to the top of its travel.
You set a gauge in the spark plug hole and zero it, when the piston is at the top of its travel......then you bring it down .15 of an inch and then you adjust the points so that they close (contacts touch).
You use a continuity tester of some sort to determine exactly when the contacts touch, on the points.
Do be sure that the piston is in the BTDC position....I believe the roation of the prop is clock wise when looking at the front of the engine.
If you time it to the After Top Dead Center, your engine will run very poorly if at all.
If you still dont understand then I will draw a picture and paste it in the post, that should help clear it up.
I think your confusion lays in what that measurement is..... It is NOT the points gap, it is a measurement from the top of the piston to TDC through the spark plug hole.
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