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In rebuilding motocross motors, the Hotcams shims are poor quality and don't hold up. ProX shims are great, equal to OEM at a fraction of the cost. Jap shims measure 7.48 and 9.48 mm.
john

Not sure what it's called but anyone have the torque spec for the handlebar clamp? The 4 screws at the top holding the handlebar

Be sure to torque the front bolts fully with zero gap between the top and bottom clamp before you torque the rear bolts. john
 

I just performed this procedure on my bike. The only difference is mine has a little more throttle preload than Deadstiff's set-up. Deadstiff has a right wrist injury so strength and range of motion are less, so we set his preload to a bare minimum. Very nice with a solid clunk when the throttle snaps back.
john

I helped Deadstiff reduce the preload on the throttle return spring. I drilled 3 holes for a 4-40 allenhead with 2 nylocks. The purpose of the 3 holes was adjustable preload via trial and error. Basically try the lowest preload, assemble the throttle body and see if the throttle would snap shut. If not, try the next hole. When you find what you like put everything back together. Deadstiff was installing new cables, so it was the perfect time to mess with the return spring. It's going to take you a couple of hours to do this. I've done this on my XR600 desert and it worked great. So far Deadstiff has had luck with this.
john