I did a quick search and didn't really find what I was looking for. Yesterday: I've got a 96 yz125 and it just recently flipped out on me. I was putting around my yard after lowering the needle in the carb. I was pulling the bike into my garage and put it on the stand(still running) and turned the gas off. I was gonna let it run the gas out of the bowl so i just let it idle. Now I know that the rpms raise a little when about to run out of gas, but my bike went full throttle. I hit the kill switch and it didn't work, I opened and closed the throttle in case the cable was hung up, still nothing. I waiting a moment to see if it would run out of fuel, but it was really making me nervous screaming at full throttle. I jumped on it and mashed the rear brake and jammed it into first gear. I immediately fired it back up, and it idled fine, and the kill switch worked fine. Fast forward to today, and I crank it up and put it into first and putt around the yard again. I notice that it was making an awful clank noise when I let the clutch out. I pulled the clutch cover off and everything seemed to look okay. I pulled the chain off and ran through the gears( with the bike on the stand) and it made no noise. So I guess it has to have a load to cause it. I really don't wanna split the cases, but I fear I must. Any ideas what could be it?