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RE: 1981 XJ 650 problem
schultzy said 2008-11-18 10:15
i had the same problem with the one i just purchased. after huge trials and errors and working systematically from the airbox backwards, i discovered that it was a huge vacuume leak!! finally after the 27 years that the bike had been alive , the gaskets inbetween the inlet manifolds and the head rotted out!!!. quick clean, and new gaskets (which u can still buy genuine, manifolds too!!) bolted her back together and hey presto!!!! i had a rocket again.