Hi AirGar,

I feel bad that you have the same problem, but I'm glad I got someone to troubleshoot with.

I did check the exhaust pressure nipple, and it is clear - however, I'm not sure if making it a little larger will help. I'm reluctant to make "destructive" fixes (drilling) except as a last resort, I don't like to order new parts, so I always try "fixes" that can be easily undone. You suggested relocating the pressure nipple - any suggestions where it should go?

I do know the local SuperTiger fans always drill the fuel nipple (into the carb) one size larger and this fixes their fuel delivery problems.

If you suspect the problem is the muffler pressure, see if the fuel in the line (residue from filling) migrates towards the tank when the engine first starts. Note, at first starting the tank begins to pressurize, after it starts, the tank is pressurized and the fuel moves slowly, so you have to see if pressurizes it when the engine first starts.

If lack of pressure seems to be the problem, I would first try the "good" engine muffler on the "bad" engine, if the problem clears up, then we know it is the muffler - if not, then it is something else. If the problem is in the mufflers, then very carefully dissassemble the second muffler and examine the exhaust nipple, both ends, before removal and see if there is any differences. Look at the openings of the nipple to see if there is any metal flashing or if there is special orientation compared to the other. This is the only thing I can think of that may be different between two similar mufflers.

The other thing you may want to try is to remove the carb from the "good" motor to the "bad" motor, if the problem is fixed, then the carb settings will be the problem. If the problem is not fixed, then it is an air leak, fuel delivery problem, muffler.

My motor is working fine now, but I'm sure there is a better fix than the baffle, I'll post anything new I find, please let me know what you find.

Thanks for your help.

Fly4Fun,

Wayne