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84-85 XR250 head

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I just converted my '85 XR200 to a 250; bought the cylinder and piston, trimmed the sleeve at the bottom, and milled approx 6mm from the cylinder block. Bolted right on. It does have more power, but I think the only way to truly have the 250 power is to use a 250 head,which has bigger valves. I cannot seem to locate one. If anyone knows of a source, or maybe a parts bike for 84 or 85, please send me a PM. Thanks !!

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