compression check

[spicerak]

what should the compression be on a 1989 evinrude xp i have heard so many things not sure what it is and what should it be after a rebuilt

 

[kenmyfam]

Re: compression check

Each cylinder should be within 10% of each other and a lot of compression testers are not overly accurate so if you can check with a couple of them and compare. Post your results.

 

[spicerak]

Re: compression check

ok but if someone rebuilds it what should my compression be 80 90 100 110 what would be good because im getting it done and i want a good job

 

[Solittle]

Re: compression check

If compression is as kennyfam suggests most outboards will run fairly well down to 90 psi or so. We would like to see compression in the 110-120 range for crossflow V4s. I have 2 1987s & compression is around 105-110 lbs.

 

[kenmyfam]

Re: compression check

I have 2 compression testers and my 140hp looper reads 135lb on all 4 cylinders on one of them and 120lb on the other one.
Which one if either are correct I do not know but I do know that all cylinders are currently even and the motor is running like a charm.