It's in limp mode due to a belt issue.
Tightening Belt/Belt Light Reset - MudInMyBlood Forums
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Belt Light Reset
To reset, turn ignition off and pull cvt cover. Put switch inside cover back into "on" postion. Remove seat and disconnect the 2 connectors grey and black and reverse them. They are located if sitting on quad in right rear corner. The grey one is not connected to anything, it's just a reset plug. Grey into black and black into grey. On top of the CVT cover is a black connector that goes to the switch inside the cover, disconnect that at this time. With the 2 still reversed and the black one disconnected, turn the key to the on, but don't start the quad. Observe the belt light. When it stops flashing really fast and starts flashing slow, the belt light is reset. Turn key off, and put the 2 connectors under the seat back to their original connectors and plug the connector switch for the CVT back in. Your done.
*If it's just the 100 hour causing the light to flash, you do not have to remove the CVT cover and flip the switch. Just swap the plugs and follow the rest of the procedure mentioned above.