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Compression Test on Vmax 200HP

C

clkelley78

Contributing Member
I looking at a 2003 200HP 2 stroke VMax with 500 hrs. Did a compression test that resulted with 100 PSI on all cylinders. Does this seem low? If so what are normal numbers and what PSI with the cylinders start having problems?

Thanks,
 
As long as your compression test is the same on all cylinders and at 100 PSI I'd say you are OK. I'd like to see compression up around 115-120PSI on that engine but there are lots of things that can cause a lower PSI read... Was the engine hot/warm when you tested? How accurate is the gauge you used? Warm up the motor runningand then pull all plugs and see if you read higher and consistent across all cylinders. What causes concern is if you test all cylinders and find one seems out-of-whack that is probably fried.
 
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