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Message: [QUOTE="rmc_olderthandirt, post: 1273063, member: 68872"] In order for the engine to produce any significant amount of power it needs the appropriate mix of air and fuel. There are a number of things that could allow the engine to rev really high at idle, such as a leak in the air intake, an accumulation of raw gas in the case, etc. There is no way that the bike could produce a significant amount of power from this so if you are feeling the power at the scary level I can assure you it isn't from one of these type of problems. The only way that the engine could develope that level of power is if the throttle valve was indeed open. It can't be from anything else, so rule out the powever valve, reeds, air box, etc. For some reason, the throttle slide is NOT returning to the idle position. I suspect that now the top end has been blown due to over-reving. Like IndyMX said, leaving it in gear and jamming the rear brake as hard as you can would probably have killed it and spared your top end. This is kind of a wild thought, but check the bolts that hold the engine to the frame. It is possible that if the engine was shifting a bit under torque that it could pull on the throttle cable. Otherwise, I think that you should tear the carburetor apart and clean the throttle slide really well. Something is jamming it. Rod [/QUOTE]