Compression on 1988 Yamaha 90

[williezwildcat]

Owner did a compression check, and readings came in 110-115 psi on all three cyls. Is this below, avg, or above what a motor of this age shld have. This board is great, thanks for your help.

 

[snapperbait]

Re: Compression on 1988 Yamaha 90

Average.. As long as it's above 100psi and all cylinders are within 10 psi of each other .. So it looks A-OK..

 

[John from Madison CT]

Re: Compression on 1988 Yamaha 90

You are in great shape with that compression. Enjoy what I consider to be one of the most reliable engines ever made.<br /><br />John