Hey guys, I've got a 2009 YZ450 that I've put 130 hours on. I bought it used and am not sure of the actual total hours on the motor. Anyway I'm at that point where the middle intake valve has finally tightened up on me. I've already shimmed that valve once so as I understand it, it's time to service the head/valves. Before the bashing begins, yes I've searched the forum and have read so much that my eyes are about to cross. I've reached out to Fastheads and Engine Dynamics for some prices but I would like to know what exactly do I need to have done? I'm assuming seats replaced and new valves and keepers as cheap insurance. I wouldn't think the guides need anything? Springs maybe? Motor is stock and I don't race it or ride it hard. Any help is appreciated.