OK quick run down.... bike ran fine. no problems started right up plenty of power. one of the exhaust studs were broke so went to fix it and the rest broke along with it. figured just take it off and to the machine shop and get the threads fixed. pulled the tappet cover and the came journals were trashed. grooved all to hell and just junk and trashed the head and cover. no big deal. got a new camshaft and head also the cover. put it all together. check the timing dots, top dead center with the cover on and all in place. go to turn the engine over by hand by the crank bolt and locked solid... after going over everything and takeing it apart 20 times I find out its an after market camshaft. (stage 1 is what I was told) anyways I take the chain off and motor spins free. left the chain off and bolted the cover on with the camshaft in there and tight as hell to little no movement. manual says ft pds 7 on intake and 8 on exhaust or whatever it was but if you even quarter turn past snug (just barely tighten) it goes back to being hard to turn over by hand still. I set the valves to .004 intake and .006 exhaust as seen on a tread on here and still turns over very hard. its gotta be something in the setup that im not seeing. ive done many 4 wheeler motors and never came across this. maybe im looking to hard instead of the easy stuff ?