[johnovan]

both of my exhaust shim,tappet dropped out and lost what size should I put back in it?

[motosicko]

First things first. You best find them. Hardened steel shims will destroy your motor.

[johnovan]

I found one of them how can I find out the measurement of it?

[JimDirt]

You need to find BOTH of them , if they are inside the engine bad things will happen , to measure them you need Digital Calipers like these

http://www.harborfreight.com/6-in-digit ... 61585.html

[riddler9]

Or, you can just leave the other shim floating in the engine and keep a video camera on it when you fire it up. We hate to see destroyed bikes, but something planned like running it with a shim floating around may have some entertainment value.

[crfsonly]

not sure where you have looked but they often end up on the backside of the flywheel. as mentioned DO NOT run this motor until you recover both.