Joe, call BRM.
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Emergency. Yamaha. 115. 4 stroke
Looking at a 05 tomorrow morning and need to know the psi for compression test. Have tester will travel. Help please
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Joe, call BRM.
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Charlie Weaver USN/ENC 1965-1979
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Best info I can find is : 135psi would be the minimum, and that's very close to a worn engine reading, so you'd want to be much higher than that. All cylinders should be within a few percent (5-10%) of each other's psi numbers.
I know nothing about any of this, and these numbers were taken from other forums and from supposed marine mechanics or just forum members relating what they experienced.
... cp
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