Chainsaw Repair

Well, just because a carburetor passes these checks of the metering valve seat, the high speed nozzle check valve, the idle circuit, and that the pump diaphragm doesn't have a hole in it . . .  These tests didn't check that the pump check valve tabs were seating and not curled up, or that the metering valve diaphragm is not stiff as a board, but at least it helps.

There's nothing like getting out a new in box (NIB) carburetor, putting it on the saw, and you can not get any gas up to the saw because the metering valve is stuck in its seat from setting so long or the pump check valves have curled up.

The bottom line is . . . how well you can get the chainsaw to run.