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1982 xr250r

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I have had a run of bad luck with dirt bikes in the past few months I bought a rebuilt 1982 XR250R the bike ran great for about a month and a half then jumped time.When I took the engine apart to diagnose I found that the cylinder had been bored and a new piston and rings had been installed but the old timing chain was still in it.When it jumped time it bent both exhaust valves.While trying to determine the over bore on the cylinder I saw that the domed piston hd most of the top ground off with a grinder.I need a cylinder and head for a 1979-1983 xr250r if anyone can help me please send me an email. rachalmoto@gmail.com

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