Modern Vespa : Where Do You Measure From When Calculating Port Timing?

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OP Christopher_55934 UTC details Ossessionato 2007 Stella 225 Joined: UTC Posts: 3547 Location: Rochester, Minnesota
OP Christopher_55934 Ossessionato 2007 Stella 225 Joined: UTC Posts: 3547 Location: Rochester, Minnesota	UTC quote Out of curiosity, as I have read and seen people measure and use both methods. Do you measure from, the top of the piston or top of the rings? I see some people say the top of the ring is what seals the port not the top of the piston. Would make a huge difference in calculated port timing.

BlackT5 UTC details Hooked Joined: UTC Posts: 128
BlackT5 Hooked Joined: UTC Posts: 128	UTC quote Top of piston.