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What is the cylinder compression for a 2003 90 hp mercury outboard?
Wiki User
∙ 13y ago
I have a 2005 and compression should be close to 120 psi. Normally a good engine will have compression between 115 and 130 psi but a leak down test should be performed also to know the full condition of a cylinder.
Wiki User
∙ 13y ago
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