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What is normal cylinder compression for a 1984 Mercury 75 hp outboard?
Wiki User
∙ 15y ago
In the yesteryears of outboards, compression readings of 150 - 180 lbs were common. Today, for 2 stroke models, readings of 110 - 130 are average. Basicly, anything over 100 psi is good, with no more than 15 psi variance between the highest, and the lowest cylinder readings.
Wiki User
∙ 15y ago
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