Have a 2004 150 carb yama.

I keep getting a lot of excess oil under the cowling after running for 2 hrs. or so.

I know its yama lube, but cannot seem to see where its comming from, When I remove the cowling It can be seen puddled up in the nicks and crannes under the motor.

I took the silencer off and there was a lot of oil which I drained from inside the silencer. The drain line on the silencer was open and not stoped up.

Could I possibly have a bad check vale on one of the carbs ?


Any ideas,


Bill Granade