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The design is quite close to the old XR200, but the frame of architecture is a little different. The engine you're working with can accept a larger bore cylinder, due to wider stud spacing. I haven't taken the time to compare cams, but I wouldn't be surprised to learn that a hot XR cam might wake up your motor. Maybe Webcams would be a good source.
You could also play with midrange settings on your carb. Have you tried shimming the needle, or only moving the clip?
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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