Small Engine Troubleshooting Problems? Ask a Mechanic Now.
CH730 is twin engine, Have you ran a cylinder balance test, to see that both cylinders are firing at idle? Remove one spark plug wire at a time , to see if engine will continue to run. If engine dies when wire is removed, the opposite cylinder is not firing. If it is not firing on both cylinders at idle, you get the loading up with fuel, and poor idle. Have you had carburetor apart, and it is clean?
I can call for additional charge, but did you see my response, and make the cylinder test?
CH model has been around for years, Sounds like carb problem. Here is link to service manual.
You can try the adjustment, but I doubt it is the problem. I figure you will need to check the float and needle valve area.
Float should have a metal tab, that can be bent , to stop the upward movement of the float, and let it push against the needle. I don't find a good picture of it, if it is not there, do you see where it could be broken off?
Float should be set where it is basically level, when needle is seated. You may need a new needle valve and seat, if it does not shutoff fully.
Is th efloat you have the black plastic material or a brass float. Brass float can be leaking, and have fuel in the float. The black float is not hollow and can't leak.
You have had carburetor off, and the mounting gasket is good? No intake leaks? I think needle is not seating good. You could try lowering bowl a bit more, but if float is not hitting the top of carb, it should be shutting off the needle passage,
The carburetor is the only thing that affects the fuel to the engine . I would try a carburetor kit, but that would be your choice, I do see new carburetors on Ebay for $300. I think problem is the needle valve and float.
Please accept and rate to close.Thanks.