I personally would go to Richie at RR. He is off of Faulkenburg, its like a 2 blocks north of 60 on the left. Its a business/warehouse complex and he is in the back. He has a few mechanics who do good work on dirt bikes/4 wheelers. Plus 1 of the mechanics there is a yamaha nut(steve). If they dont work out for you try Throttle Factory on Kings just south of 60on the right. Mike is another Yamaha nut and he does good work from what I hear!