Merc. 9.8 compression question

pikefisherman

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what is good compression on this motor what is bad it idles rough.
 

JB

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Re: Merc. 9.8 compression question

Rope start, right?

Good is both cylinders within 10% of each other and over about 65-70psi.

Bad is big difference in psi or both down around 40-50psi.
 
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