Originally Posted by Otto Skorzeny
The piston will be at its highest point twice in a cycle. Compression stroke and Exhaust stroke. You don't want to mark TDC on the Exhaust stroke.

Why not? The pistons (1 and 6) will be at the same position regardless of the valves. I can do just as good a job of setting ignition timing with the light flashing on #6 cylinder's spark as I can on #1. I've won a couple of $100.00 bets by doing that.
Jerry

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