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Old 11-23-2009, 11:31 AM
77SceptreOB 77SceptreOB is offline
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Join Date: Jun 2009
Location: Columbia, SC.
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Default Re: Compression Question????

You can try a De-carb process, but those #'s are pretty far off. General rule is: the range should NOT be more that 10 psi or max max of 10% differnce. That would be a 12psi max. You are 35 psi, surprised the engine runs well w/ those #'s.

Did you check the compression when the engine was warmed up?? Also was fuel/oil running through it at the time of the test?(Kill switch in safe mode) All the plugs out at when you cranked it over?? All of the above can affect the #'s as I have read in many articles on the subject.

I just went through this exercise myself in the past month. Fortunately my max range was 9 psi.
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