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Hi
I have recently rebuilt the piston and rings and now for the top end. Me intake valves have no clearance and my exhaust are reading 0.015mm when should be 0.018 if I'm right? Either way they are 0.03mm off. Could someone please explain the whole shimming measurement so I can get a reading and go from there? Thanks

Hello & welcome.

Go to the "How to" section and search down through the menu and you find find many articles on adjusting / Shimming the valves. Great pic's to help you out also.
Many good threads on valve issues also through out the CRF site.