Hey I need a little help here, I'm trying to help my friend adjust his valves. Both our first time. Exhaust valves are in spec, both intake were super tight couldn't even get the smallest feeler gauge in there so were assuming the clearance is .000. it's a used bike so we don't know how many times it has been shimmed. One shim is a 1.65 the other is unreadable we're getting. A caliper shortly here. My guts telling me these are really small shims and the valves are just worn out, but we just were told by the previous owner both intake valves have been replaced. Can we still shim these valves? It's an 05 crf450 spec is .006 intake and .011 +-.001.