Looking for Compression Numbers for a 1992 Mercury Black Max 135

[powderhoundbrr]

Wondering what compression numbers I should be getting on cylinders. I lost some power and am going to check out compression tonight.

 

[JB]

Re: Looking for Compression Numbers for a 1992 Mercury Black Max 135

All cylinders should compress in a 10% span. With correct procedure and a good gauge you should get over 100psi. Here is a procedure that works.

http://forums.iboats.com/engine-frequently-asked-questions-faq/compression-test-jb-391323.html