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2006 Mercury 50hp 2 stroke compression

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dhearn0513

Contributing Member
I was just wondering what was the compression of these engines when they came from the factory. I just bought a boat with this engine and when doing the compression test all three cylinder measure 110 psi. I know that this is good numbers but just wondering what is was from factory.
 
They don't really publish the readings as the difference in gauges is so huge.
The important thing is all cylinders are the same or real close.
My tester cost $160 in 1987.Don't go cheap on this tool.
The one you get or have might not read as well.
They say a 10% difference in cylinders is acceptable.
My twin 88/85's have 145-148# on all 6 cyl.
At 10% that would be 15# difference.
I"D FREAK if there was that much difference.
I'd start looking for a problem.
 
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