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TOP END RATTLING

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I took my 2005 DR650 out for an evening ride, when, cruising along in 3rd gear at about 35 MPH I heard loud POOF! followed by slight power loss and a metallic knocking from the CAM area. The idle speed also jumped up. The bike starts up and runs but the metallic knocking is very audible. Does anyone know what these symptoms mean? 

Please help. 

Thanks. 

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So, I took the top off the engine and found out that the screw and nut used for setting the valve clearances came loose while running. Good news is, I found both parts but beat. Bad news is, they busted the spring on the auto decompressor, which the parts are not sold separate from the Cam assembly. Can I just remove the auto decomp or do I have to buy a new Cam?

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