Originally Posted by wendellc1

I have a Sirio .12 TUP. I put a screw driver through the exhaust to keep the shaft from spining when installing a really tie clutch nut. I know that was really stupid. Anyway, I scratched the piston and sleeve. When starting the engine, it starts and then dies unless I give it a lot of gas. It ran okay for 1 tank of fuel. Then adjusting the setting can't keep the engine running. Did I killed the engine? If yes, where can I buy new piston and sleeve. Thanks.