Hi

I converted a Ryobi for my plane. I first ran it in Jan '02, it ran like a champ. I adjusted the carb just like a glow engine, the high speed I got 7100 rpm with a 16 x 10 Master A S, the low speed was down to 1700 rpm, but I set it on 2100 for safety.

I flew it that way a few times, I was very impressed. The one day it wouldn't slow below 3500 rpm for landing. Today I took it out, I'm still getting 7100 rpm, but about 2400 rpm is the lowest I could get it to idle, and I have to be very careful when advancing the throtle or it dies. The engine also seems to snize during taxing(3500 rpm) and then dies.

What happen to my engine to change it?