compression
My 300s around 180 most of the bikes ive owned have been 170-200
If you really had 125 psi your bikes would likely not even start. ive had bikes needing rings test at 150 first symptom was hard starting.you have to make sure throttles wfo and you have a good seal on the connection toi the plug hole ,is there an oring? I've only used oil in the cylinders to check rings if you have low compression .test dry first then if readings low add some oil if it goes up alot rings are suspect.
Dont know anything about boats...............
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