After picking up my new WR450 from the dealer yesterday, I took the unit home and started to perform the 3X thermal break-in warm-ups. On the second warm-up start I pushed in the starter button, started the engine, released the button - and the entire starter button, w/ pressure spring/tab flew across the garage. Finding the parts was one thing, but I could not reinstall, or by that point even wanted to do so. It was 3:00PM Saturday when I got to the dealer. They installed a Yamaha starter switch from an Yamaha ATV and it works fine, but what a shocker. When I get the replacement switch w/ wiring loom I'll install it. But if it fails again on the trail, I'll have to hot wire it like I am jacking the bike. Also, dealers are re-jetting the pilot too low (#40) for high altitude (5K ft.), causing RPM fluctuations during constant throttle position up to to 1/4 open. I richened to pilot adjustment screw out one full turn. This helped a little, but I will need to go to a bigger pilot jet (#42 or #45). Incidentally, the hyra brake switch from Baja Designs is too tall to fit the space between banjo/head bolt and the subframe. I'm fabricating a plate to lower the master cylinder down 1/4", and readjusting the brake lever height. Other than that all the aftermarket parts from my 02' WR426 (sold) fit - except the skid plate. I needed to drill another hole in the rear to mount it to the frame.