lelliott19
Recruit
- Joined
- Jul 23, 2009
- Messages
- 2
What is the desirable compression ratio for a 1993-94 90HP Yamaha outboard? Ours checked out the same in all three cylinders 130 psi. Since all three cylinders checked outthe same, I am assuming that is a good sign, but I don't really know what it is supposed to be.
