earlwb

Now I have had problems with the diaphragms on the carbs of all of my engines. I have replaced the pump diaphragm with the teflon one. But the black one on the regulator seems to get soft and stretch out after a while, thus it doesn't regulate the fuel anymore. On the NGH engines, they use a soft aluminum pivot arm for the fuel inlet valve and I have had to bend it back up or replace it with a Walbro arm. Usually when the engine suddenly starts to flood out on me, that means the fuel inlet valve has a tiny piece of debris in it, or the pivot arm got bent, or the diaphragm on the regulator stretched out too much on it. I would have thought the diaphragm stretching out would not cause it to flood, But it does. Go figure.

I suspect that there are a lot of fake or counterfiet Walbro rebuild kits out there. That tends to obfuscate the issue too. As the diaphragms may be substandard.