I never thought I’d have to worry about a vintage 2 stroke having too much compression but is 190 without exhausts on too high. If so what would be the cause and solution?
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Thanks for posting your concern, .... but It's highly unlikely your compression is that high.
In fact, 190 psi would be virtually impossible to achieve even if you were trying.
Is this your 360 you're talking about?
From experience, 120 to 135 is more the norm for a good healthy running engine.
Perhaps the gauge you are using is faulty
I'd suggest trying a few more gauges and compare your results, as things just don't add up.
If the bike has been running fine, I probably wouldn't worry about it.