1988 88hp evinrude compression ratio

[horndawg]

I am looking at buying a boat with a 1988 88hp evinrude motor. We did a comp. test on it and found that all 4 cylinders had about 90psi. Is this low for that motor?

 

[tashasdaddy]

Re: 1988 88hp evinrude compression ratio

all guages are different, the most important thing is that they are equal. i would do a decarb on the motor after you purchase it. it is an enema for your motor. gets the crud out.

 

[horndawg]

Re: 1988 88hp evinrude compression ratio

Is this decarb something that can be purchased at a boat shop? And you say as long as they are equal it's ok comp?

 

[JB]

Re: 1988 88hp evinrude compression ratio

The important result is that the cylinders are near equal.

Decarboning procedure is explained in the Top Secret File at the top of this forum.

 

[emdsapmgr]

Re: 1988 88hp evinrude compression ratio

That compression is fine/normal for that year. Some of the earlier models ran higher compression.