your valves may just need adjusting. Check them before you start ripping the head apart again. This happened to me once after porting and polishing my head, i forgot to adjust the valves back to .002/.003 and the ticking was really loud.
This is a discussion on Cam chain Rubbing ???? within the CRF50 forums, part of the General Talk category; I got my bike back together and running well. I but in a new red baron heavy duty cam chain and as you know they ...
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Thread: Cam chain Rubbing ????