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Old July 6th, 2008, 11:50 AM
JKNZ JKNZ is offline
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Default 2002 Mercury 90 Compression Test
I tested the compression of my 2002 Mercury and #1 hole 110 psi, #2 hole 105 psi, and #3 is 80 psi. Is that in the normal range?

Thanks.
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Old July 6th, 2008, 12:21 PM
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JB JB is offline
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Default Re: 2002 Mercury 90 Compression Test
Nope. #3 is sick, probably only carbon buildup.

Go to the Engine FAQs for how to do a decarbonizing with SeaFoam.
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Old July 6th, 2008, 01:32 PM
alanaexall alanaexall is offline
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Default Re: 2002 Mercury 90 Compression Test
2 or 4 stroke ? top or bottom hole
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