I have read many posts and nobody has mentioned excessive chain noise and bouncing. Than chain is adjusted to mfg. specs and I have tried going a little tighter and looser with the same results.After my ride last weekend I even noticed it had worn the aluminum frame up close to the counter shaft.I have owned a 1999 wr400 and several other thumpers but never felt this much noise or vibration. the dealer told me to check the notches at the swing arm and they are straight on each side. any ideas ?