Blown YS muffler
 

The YS 140 FZ muffler mounted on my DP Ulty opened up like a tuna can. Has anyone seen this before? [X(]

RE: Blown YS muffler
 

Running hard, it got hot, very hot. DId you have it in the air stream? Get a pitts muffler or put a hose on it and extend the exhaust to the rear. The hose will make it loud but it will do until you get a replacement.

RE: Blown YS muffler
 

Yup, muffler was in the airstream and the engine gets pleanty of cooling. I've already decided to get a Pitts muffler for it. It's too darn cold to be flying much more this year so it will be ready by warm weather. Is it Spring yet? :)

Thanks

RE: Blown YS muffler
 

If the muffler was in teh airstream, I would make sure that you understand what happened.
It should not get that hot or have any heavy back pressure. Did the insert (restrictor) plug up with something?

RE: Blown YS muffler
 

I have never had any luck with YS mufflers.
My FZ 1.20 muffler broke of in flight...at the bend in the header pipe. Clean break!
I was just so angry with the quality that I carried on flying through out he day making one hell of a lot of noise.
Any complaints should be forwarded to YS etc.
Yours is just wonderfull, never seen anything like it.
Send it back and make some noise yourself!

RE: Blown YS muffler
 

Jep had the exact same problem.The motor was only running in and had never gone to full throttle so I dont believe its a overheating problem.My thaughts are that the metal restrictor(washer) inside the muffler simply spunn around cutting its way through the case..Pity as it was the quietest set up I have ever had.