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Is compression number OK on 1977 800 Mercury

M

Mercury800

Member
Hello all,
Should I pull the power head and check the bottom of cylinder on 1977 800 Mercury outboard?
The compression as 145/143/140 psi but the bottom cylinder jut hit only 125/128 psi.
Is it acceptable compression for this outboard?
 
Remove bypass cover to look at piston / rings on the bottom cylinder.----Lot less work than removing powerhead.
 
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