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Possible sheared bottom cam chan sprocket?

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Hey guys. I was riding down the road yesterday when the bike just stopped running. I pulled the valve cover off and the cams don't move when it's turned over but the chain is tight and the piston is moving. Any ideas what's up? I thought maybe the bottom sprocket would have sheared the key? Does this sound right and does anyone know if this is going to be a big job to fix?

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Hey guys. I was riding down the road yesterday when the bike just stopped running. I pulled the valve cover off and the cams don't move when it's turned over but the chain is tight and the piston is moving. Any ideas what's up? I thought maybe the bottom sprocket would have sheared the key? Does this sound right and does anyone know if this is going to be a big job to fix?

Primary nut came loose, bent valves, damaged head casting, trashed piston. If the valves stayed together, the cylinder may have survived. If the valves came apart, plan on crank up needing repair and or replacement.

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Thanx guys. Am I going to be able to do all that with the motor in the frame or do I have to take it out? Can I get at the bottom sprocket from the clutch or do I have to crack the case?

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You can inspect and even correct much with engine in the frame.. But if a valve came apart and got smashed between the piston and the head.. You likely bent the rod, and that means the engine comes out. cases split, ect.

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