Yamaha 115 Compression

[Scotakns]

What should the compression be on a 115 Yamaha. Can you check it cold and will it be a lot lower than it would if it were warmed up first. Cold they were 80lbs. each and all equal. Is this bad???

[flabum1017]

80 is a bit low, and yes the compression changes when it's warmed up. It can go up or down depending on the condition of the motor. Try de-carbing the motor a couple times and re-check the compression.

[Scotakns]

The motor seems to run out ok.