I bought a 02 YZF250 that needed a head. I bought a good head from a friend with 03 cams and got the bike running first kick. I never really rode it because of the weather , and now it won't start. After checking all of the usual stuff I found that my intake cam is really hard to turn. Is there anyway to fix this without replacing the head? Maybe having it machined Line honed? Has anyone ever heard of this before, or know the cause?Thanks.