Hi
My 120 nc has good idle but when i throttle up it sort of back fires ,stops and throws the prop loose. It has no low needle valve and regulator is flush. It seems to run better in a richer setting but after running for over 30 sec. at mid to full thotle it eventually dies and stops running. I had sent it in for service and had the cylinder, piston, gaskets ect...replaced. Out of 20 flights i have come in 14 or 15 dead sticks thank God i have a very forgiving p-47.
I noticed that when i leave the glow driver on it seems to run better in the high and low end.. i am using a new f plug. Can i install and run it with an onboard glow threw out the whole flight or will this over heat the plug and burn it out .
I have run many saito's and o.s with pumps so i am quite familiar with glow engines but have had nothing but headaches this this one.
thankyou
Tony...

Call YS Service at 775-782-4562 to discuss the problem. If the engine has recently been in to that dept. they will want to know of your problems.