OK, here is my problem. 450 got hard to impossible to start when it was cold, but would start easy when it was warmed up. so we checked carb and it was fine, checked spark and it was good. next we checked the valves and decomp. exhaust valves are within spec but the intake valves are so tight you cant get even a 2 thousanths feeler in there. now im not an expert on this, but why would valves tighten up? shouldnt they get looser? Oh, and its an 06 450er with stock motor.