I bought this bike about 2 months ago. My first RM. I dont know the guy I bought it from. Craigslist. Anyways, I put a new top end in the bike because I wanted to see the condition of the motor. Crank seemed fine. No "clink", no vertical play. Cylinder was in good condition with no visible ware on it. Old piston was chared on top and bottom side was the same. Looked like it had been reringed. So I put in the wiseco piston kit. Put it all together and fired right up. Broke bike in softly for first 2 hours. Never past half throttle, and stayed conservative for the next 2 hours on motor. Rode the bike on trails and track, about 50/50, total 25 hours on new top end. It ran like a raped ape for six weeks and I loved every second of it! So the bike all of the sudden dies at idle going over a jump in midair. It starts right up, and revs and runs like a champ IF IM ON THE GAS. The second it goes to idle the piston is hitting the head. you can hear it go tick tick tick tick and then dies. Pulled it apart and sure enough the piston is just barely making contact with the head???? its not scaring the head or the piston. its just enough to leave almost a shadow of a mark. The wiseco piston has the right part number on the top of the piston. I checked the crank and still no vertical play. WEIRD. I have set the OEM piston next to the wiseco piston and they are the same hieght(by my eyeball). Anyone have any ideas on where to go from here. I already ordered the new Hot Rods crank and OEM main bearings and seals. The piston has some odd ware on it.(from hitting the head im sure). the pin has some odd ware as well. Its killing me on the money side of things. Should I just replace that wiseco with a new one? Sorry for the long story, just trying to eliminate needless questions to find a quick solution. Im supposed to be going to the dunes in a couple weeks. All RM info welcome! IM NEW TO THE YELLOW FAMILY!