KNOCKDOLIAN wrote on 03/26/11 at 13:01:26: I went through all the jet info and got it running sweeet. I have now fitted a HD muffler and it just wont run right.
If it runs "sweeet" w/ the strate pipe, and that terrible w/ the muffler, then the muffler is at fault. There is no muffler that is going to cause that much of a problem unless it is seriously (defectively) restricted !
A muffler will cause it to run a little richer, but not to the point which you describe.
That makes sence, Didnt get around to it today. Had a marathon to run. Ill play againe when I can feel my legs