YS Engine with pitts muffler?
 

WIll a YS 45 or 61 run with a pitts muffler? dont have room to run a piple

YS Engine with pitts muffler?
 

did you ever find out about the pipe? I'm wondering the same thing on my ys 45..........

YS Engine with pitts muffler?
 

Yes, it will run, just don't expect the same performance without the pipe as you would have with the pipe. The intake and exhaust ports are timed for better performance with a pipe.

John