Hi all.
Started my old trainer tonight. It dead stivked on me the last time I flew. So I checked the fuel lines and such. all looked good. So in decided to run a tank of fuel through the Evolution 40 NT. While it was running I noticed that the silencer was spinning. I stopped the engine and tried to tighten it, but could not get it to tighten any tighter. Do I need to replace the muffler and the silencer? Could this condition be the reason I got the deas sticks. The engine seems to run good most times, and it seems to run better and have more power than the OS 46 LA I just bought new.

What are you calling the muffler.... and what are you calling the silencer? This should model should have a bolt throug the center lengthwise with a nut at the front end correct? Are ou saying the back end is rotating on the fixed portion attached to the engine? If it's not tight you could be having back pressuer issues and that could cause the flameouts. Are the nut or threads stripped on the long rod running through it lengthwise?

A loose muffler cover like your description is a problem, but it RARELY causes an engine to fail.

Regarding your engine and it's dead-sticks, I'd follow this thread.... http://www.rcuniverse.com/forum/m_89...tm.htm#8961956

OK I stand corrected. it's the rear portion. it is loose enough so that the exhaust port will rotate 180. I didn't try to loosen it. It feels like a car start housing bolt when you can't get it apart. I'm certain that if I try to loosen it the screw shaft will snap. Guess the best thing to do is buy a new muffler.

just replace the bolt with threaded rod a bit of locktite on the rotating part will help also .heat is expanding things a bit making the bolt longer and the muffler joint larger.