One thing about bearings, a guy tried to tell me in RCU, if the bearings are bad in an engine you can here them rattle. That's not always the case. Mine weren't rattling, they were just brown and a tad rusty from not using after run oil; well, that's what they told me anyhow after I sent my 91fx in for new bearings. If you want my opinion, I think its that rossi muffler your using. I've never been wrong in my life, but in this case, I could be as far as the rossi muffler goes!

big dan