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What is the compression on a mercury 70 hp?

Hillboyz ∙

Lvl 1

∙ 11y ago

Updated: 10/20/2022

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

Wiki User

∙ 11y ago

What else can I help you with?

How old is my 70 HP mercury outboard serial number 6163485?

A 70 hp Mercury, serial number 6163485, is a 1982 year model.

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The listed dry weight for a 1988 model, 70 hp Mercury outboard is 265 lbs.

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100 psi to 140 psi.

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A 70 hp Mercury outboard, serial number OC107620, would be a 1989 year model.

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