Check your axle spikes were they lock into the sprocket there starting to chip off.I have 15 hours on mine.
![Angry](http://www.atvflorida.com/forum/Smileys/default/angry.gif)
Mine did the same, but its just the outside. Dont worry. Unless you feel TONS of slippage, dont go shelling the money out for a after market one just yet.