I have a 05 Yamaha f150and I did a compression test today.
From top of motor to bottom
cylinder 1 - 168psi
Cylinder 2 - 168psi
Cylinder 3 - 152 psi
Cylinder 4 - 152psi
The sets were identical in compression so I have no clue what's going on.
I don't know if its a fuel injection thing or...