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One way is to take a piece of solder (from a roll) and bend it so that you can stick it in the spark plug hole, against the cylinder wall. Then rotate the clutch (primary) until the piston gets to the top and goes back down. The piston will squish the solder between the top of the piston and the flat seat around the bottom of the head. You can then use a caliper to measure the thickness of that squished part of the solder.
That is your squish :div20:
 
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