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Old 09 March 2009, 13:10   #1
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compression on a mercury 75hp

hi can anyone tell me what the compression should be on a 1996 mercury 75hp its around 110psi at the moment is that a bit low cheers tim
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Old 09 March 2009, 14:42   #2
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110 psi doesn't sound too bad. Are you testing with the engine warmed up and WOT?

I was always taught that the important thing to check for was variation between cylinders - are they all around 110 psi?

Cheers

Chris
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Old 09 March 2009, 15:48   #3
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hi chris yeah they are all around 110psi and thats from cold so that sounds ok then cheers tim
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Old 09 March 2009, 18:18   #4
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Spot on 110 psi
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