I had a Saito 125 loose the muffler several times due to vibration. The last time it loosened up and tore the threads out of the engine where it mounts. I'm putting another one on a profile and a YS 140 on a 73" Sominzini Yak and I'm afraid of having this same problem. How in the world is everyone mounting their exhaust so it does'nt loosing up due to the vibration the 4 strokes make? I really need help here guys so please let me in on the trick to keeping the muffler tight. I'm ready to toss every 4 stroke I own and go to 2 strokes and gas only. In need of some tips here please.
Scott