Hello everyone, my first post. I bought a 2002 DRZ400 S for $850 that ran very loudly and clearly with something wrong. The bike had 9k miles on the clock, so I hoped it wouldn't be something so catastrophic that the entire engine needed replacement. I've pulled of the head and cylinder. Here's what I've found. The intake cam was dry and looked like burnt oil. The intake cam journals were all eaten up. The exhaust cam and journals look good though, which seems strange to me if the head was starved of oil. Maybe just an oil channel for the intake cam was blocked? Bottom of the head: Cylinder and piston: There was side-to-side play but no up and down on the rod: Frame oil screen, I think that's case sealant gunked up on it? Here's the link to the full album on imgur: http://imgur.com/a/cl1n1 So what can be used, and what needs to be replaced? What went wrong in the first place? I want to get this back to running as inexpensively as is reasonable. Obviously the head needs to go. Can the cylinder be reused? I wiped it out with WD40 and a paper towel, but didn't have anything to really scrub with. There isn't any lip that I could feel where the piston stops at the top of the cylinder. How about the piston? Could it be reused with new rings?