Originally posted by Herb
I have a GMS .47 on an airplane. It runs great, but I can't get the engine to shut down. I pulled the throttle and trim back and even put my finger over the carb and it keeps idling. It is obviously getting air from somewhere. Any ideas on how to stop this? It is obviously not a big problem, I just want to have complete control of it.
I read somewhere that after-run oil should be put directly into the cylinder through the glow plug port. It seems to me that I don't really want to take the glow plug out after every flying day. The thing I read said that the after-run oil would eat away at the carburetor's rubber gaskets.
Thanks!
Herb
Take the carb off, remove the carb tightener, put some silicone in the holes where the tightener came out of and some on the shaft itself. Also put some on the carb sealing 'O' ring.
We have found that they can leak air at this point. It doesn't take allot of silicone, just a thin film. Make sure you let it dry over night before starting it again.
This is the only place and problems we have had with over 100 of these engines sold.