verslagen1
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How many licks does it take to get to the center of a toosie roll pop?
W/o knowing the previous state of the engine, there's no way of knowing what TDC you're on.
suck squeeze bang blow, each of these strokes takes 180° (half turn) a TDC occurs every full turn.
You want to adjust the valve at the end of the squeeze stroke. This is where it is crucial that the valves are closed.
rotate the engine and watch the valves move... intake opens, then a little less then a half turn they close a full turn later, the exhaust opens and closes again. almost immediately the intake will open then close again. one half turn later, you'll be at TDC at the end of the compression stroke. bingo, adjust the valves.
Do this several times to memorize it... and to check yourself. it's easy with a little experience.
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