jimbike64 Posted June 29, 2017 Report Share Posted June 29, 2017 (edited) Can anyone tell me what compression should be on 07 TXT Pro 300 ? Thanks Jim A Edited June 29, 2017 by jimbike64 needed to delete word Quote Link to comment Share on other sites More sharing options...
peterb Posted June 30, 2017 Report Share Posted June 30, 2017 I don't know what the actual compression ratio is on the 300, but imagine it would be around 9:1. Therefore if you used a compression tester screwed into the spark plug hole and kicked the motor over, you would expect to read 14.7 x 9 psi, or approx 130 psi from a healthy top end. Bye, Peter B. Quote Link to comment Share on other sites More sharing options...
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