I have a 07' YZ450 that I bought new in late Dec. I'm now on my 3rd clutch kit! Has anybody had problems with smoking thier clutch. This is not my 1st 4-stroke abd I don't ride it like a 2-stroke. I adjust the clutch lever by the book (about 8mm of play). Something is not right?? It's starting to get expensive$$$$. Any help would be great!