Dave, I purchased 2 YS 110s about 18 months ago. I've had the treaded pipe that connects the stock muffer to the engine break at the transition from the large to small diameter during flight. This happened twice on the same plane. Both mufflers are lost. I'm running a gator soft mount. What is the solution and will YS replace the parts?

I'm running a 15x10 APC prop with YS 20/20 Power Master Fuel. I've run about 6 gallons through the engine. I've adjusted the valves once already. The high end is about 8800 rpm and the lowest consistent idle I can get is over 2500 rpm which is too fast to land. If I set the idle any lower on take off it will quit on landing. How do I get the idle lower?

Othewise these engines are great.

Thanks