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XR motor in a CRF/CR frame?
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[QUOTE="cujet, post: 1168670, member: 19501"] The air cooled engine is OK as a play bike powerplant. In theory there really is no reason an air cooled mill cannot be as light as a water pumper. Might be down on power by cc but probably not down on power too much by weight. Otherwise the XR motor should be a good choice. One other way to look at a project like this is to modify a Yam WR or CRFX 250 to achieve the power curve you desire. A big bore'd and stroked two fifty with a proper exhaust could be made to behave in a similar manner. Chris [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
XR motor in a CRF/CR frame?
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