My crankcase was filling with gas in between weekend gas cutting jobs.
Temporarily I installed a gas shut off in the gas line and that worked fine.
Asking around about what might be the problem, I was told that the needle valve in the carburetor was probably sticking allowing the gas to flow into the cylinder and then past the rings into the crankcase.
When I took the carburetor apart I found the needle valve misaligned with the contact on the float keeping the needle from completely seating.
I installed a new float anyway since I had it.
1 year, 7 months ago