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Yamaha F90 compression
I had my 2013 Yamaha F90 Four Stroke checked out yesterday and the compression was alarming. 1 and 3 were at 180 and 2 and 4 were at 120. This engine has 397 hours on it and has always been well maintained. oil and fuel filters have been changed every year and I have always ran stabil and ring free in the fuel. The engine has always ran perfect and the tech even said it ran and sounded great. Do you all think it's worth trying to do a decarbonization shock treatment on the motor to try to burn of excess carbon or do you think I have bigger issues?
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Was it warm with throttle plates open when tested?
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