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185psi
125 is the least
you want at least 120 PSI on all cylinders
I should be equal on all cylenders and about 110 to 120
i have a 70hp mercury outboard older late 70's model and the cylinder compression is 135 across the board. it shouldnt be below 100 psi and not more that 15 between any 2 cylinders
anything over 100 on all cyl is fine and a good motor
What year is Mercury Outboard with serial # 5863149
should be at least 100 PSI and the difference between cylinders should be less than 10% of each
hat year is this Mercury outboard 7.5h.p seal #704818
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hat year is this mercury outboard 7.5h.p seal #704818
What year is the 8hp Mercury outboard with serial o6156590 ?