I'll probably get crap for even suggesting this but replace the idler gear too, with the new unit at 36.00 bucks I'm sure anyone would have paid that not to have to push out a bike. We race, my rider is most comfortable on the WR, that's reason enough to make the bike as reliable as possible, remember no DNF's. Yamaha started testing and in some cases replacing them in some units, when I first heard (months ago) some dude in New Zealand or Austrailia had a number I got my dealer to order one it was installed approx. 2 months ago and when I put it in I marked the position and checked it yesterday the marks are 180 degrees apart so there are some kick backs. Ours failed in the driveway (Feb.)the crank and rotor were replace (no loctite) and no problems since (10 GNCC Nationals and countless Harescrambles) A 2004 WR has been purchased for next year and the 2003 will serve as a practice bike. We pay cost for the bike and a discount on parts (same deal I could get anywhere) the money I get from the dealer is just about enough to cover putting his name on the bikes.