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Inside the wheel is a rubber cush-drive (thats what I've always called it, basically a rubber cushion). Its probably worn out and needs replacing. As I understand it, the rubber cushions the trans from shock induced by on/off throttle response. Basically when the bike starts chugging for whatever reason, the cushion protects the trans. My brother has a bike with a sprocket mounted solid to the rear rim. When riding it, it is important to remember this and not let the bike chug (meaning try to ride smooth). My point is that this is an important piece. You should inspect it, probably replace it. Thats my 2 cents on the matter.
Tom
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Quote from a Kaw mechanic (my dad)
"Great idea, buy your kid a ninja for his last birthday."
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