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i recently purchased a Yamaha 90 hp motor that is a 2018 model. When I went to buy it I did a compression test and the compression was terrible/ non existent. i bought the motor anyway as the oil was really clean and i could at least sell it for parts.
After looking at it it seams like the timing may be completely off and the root cause of the problem. This is a single cam motor. I have attached three images showing, 1) the crankshaft at TDC and the other image shows the Arrow 1 of the cam at 90 degrees to the right. Then the arrow for lining up the timing below.
i hypothesize that the cause of the issue is the timing being off and wanted to get your expert opinions. I could not find anything on this motor, i can only find info on the double cam motors.
thanks
Andrew
After looking at it it seams like the timing may be completely off and the root cause of the problem. This is a single cam motor. I have attached three images showing, 1) the crankshaft at TDC and the other image shows the Arrow 1 of the cam at 90 degrees to the right. Then the arrow for lining up the timing below.
i hypothesize that the cause of the issue is the timing being off and wanted to get your expert opinions. I could not find anything on this motor, i can only find info on the double cam motors.
thanks
Andrew