Home › Forum › Ask A Member › RD-17 bottom plug fouling – no high speed power › Reply To: RD-17 bottom plug fouling – no high speed power
Well, there are a few conflicting symptoms you point out here….
If the carb is at fault, why is just one plug so messed up? I don’t know where you got the replacement carb, did it have a nozzle gasket? Once again, a carburetor issue is not going to affect just one cylinder. Are you running this engine on its pressure tank, or have you converted it to single line/fuel pump? If you converted it, perhaps the fuel pump diaphragm is leaking into the combustion chamber.
You report that the engine seems to idle fine, but it sure seems like it is running on just one cylinder at high speeds. Reed issues, or internal damage would surely affect the idle quality first.
So, if everything you report is accurate, I’m thinking you are losing spark on that cylinder when the throttle is advanced. Perhaps the vacuum switch isn’t working correctly knocking out one of the cylinders….
Are you sure it is idling on two cylinders?