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XR100 Motor Identification

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Hi guys - Im in the middle of building a XR100 do do a little road racing with and im stuck with a question about the motor. I aquired a pile of xr100 motors and parts from a friend. Im putting together one of the motors that didnt have a flywheel or igniition on it wich i didnt think twice about cause i had a pile of extra parts. well when i tried to put a CDI style flywheel on i realized the shaft and taper were different on this motor than every other xr100. shaft diameter is .826 and is about .325 longer than a stock XR100 crank. I have no idea what motor i have. the Engine Code is HE05E-5302511. Any help would be great.


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