87 mercury black max

[87 skeeter]

what should be the compresstion on my 87 mercury black max 175hp

 

[starcraft1982]

Re: 87 mercury black max

You want even compression numbers.No more than 10% difference in any one cylinder.Guages differ in actual numbers but youre looking for over 100(preferrably 120+in all cylinders).Again,the10% rule is the main concern.

 

[87 skeeter]

Re: 87 mercury black max

thanks for thr reply...will used that when i check thanks.....