1987 yamaha 115 two stroke

sportsman007101 · Mar 24, 2013

i am going to do a compresion test on this motar and wondering what is the normal pressure and what is the pressure allowed to vary by.

JB · Mar 24, 2013

Re: 1987 yamaha 115 two stroke

Hi, sportsman.

Welcome to iboats.

Measurements depend a lot on the gauge and technique you use. Typical readings are over 100psi.The important part is that all cylinders are in a 10% window.

Any doubts about technique can be resolved by looking here: http://forums.iboats.com/engine-frequently-asked-questions-faq/compression-test-jb-391323.html