1995 Merc 100HP Compression numbers

[canadian_fisher]

I am looking at boat and motor on Wednesday with a 1995 Merc 100HP. Dealer claims the Engine has good compression numbers but I'll do my own check after it's been running on the lake. <br /><br />Can somebody give me a good range for compression here? (100PSI, 125PSI?)<br /><br />Thx. CF

 

[studlymandingo]

Re: 1995 Merc 100HP Compression numbers

I'd shoot for the 120 PSI range. Most importantly, each cylinder should be within a few lbs of each other. i.e. no erroneous numbers that vary greatly from the other cylinders.