I need your expertise on a few questions iv got.I had my 2000 426 out for a ride last week. I hit the rev limiter 2 times on a stretch of trail in 5th gear and after that the bike was noisier than usual. I thought mabey the valves needed adjustment so I parked it. Last night I finally got a chance to check it out, it had 1 loose exhaust valve and 1 tight intake valve. The intake cam seemed a bit tight in its bore. I also took the jug off and found the piston is scored on the back skirt from the oil rings down. The jug is trashed because of this. the top of the piston is fine and so are the compression rings. The piston to pin was also tight and the pin bore in the piston is galled. It lookes like mabey it was low on oil, but I know the oil level was good. Do the oil pumps go bad? I need to redo the jug so is worth it to get a bigbore kit? How can you tell if the crank is good? It clunks just abit when you turn the flywheel back and forth but the rod seems tight up and down. Any suggestions will be helpfull. Thanks!