Resetting Timing Mark

[Bob Lorenzini <hwm@xxxxxxxxxx>]

Trying to find tdc with a dial indicator will result in ambigous results.
Fit a positive piston stop in #1 hole that prevents the piston from just
reaching tdc. Rotate the engine to this stop and mark this spot, rotate
the other direction and mark this stop. Halfway between the two will be
tdc.

Bob

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