|
Float height and float valves first port of call then, If the height is correct and the fuel valve is clean I would look at changing the float valves because the tips are rubber and get a groove after a while. Look at the tips with a magnifying glass, and also check the little sprung plunger is moving freely they are not expensive. From the slow nature of the problem it looks like poor seating rather than a stuck valve which would manifest fast.
If there is substantial fuel in the oil it will need changing and disposing of carefully for obvious reasons. The only other thing that will do that (assuming the jetting and main needle height is a severely clogged air filter but with fuel in the oil I'd go for float valve.
|