first off, i'm john from salem indiana. i ride an 04 kfx 400 with full yoshimura exhaust, jet kit, hot cams, and a g-force axle. my problem is i took my quad to a friends house, and while i was riding his honda cr450r dirt bike he was on the kfx. all the sudden he just stopped, we got it back to the garage and upon further investigation we found the timing chain had jumped 3 or 4 teeth on the intake cam. i got it back in time and tried to start it, and it fired and ran for a few seconds but, then shut off. my questions are, are these engines valve benders, second how involved is removing the head to have the valves replaced, and third what all can i expect to replace other than timing chain, tensioner, cams, and valves? any help would be a great help.