Replace or upgrade your worn chain and sprockets with this market leading sprocket kit featuring quality JT & Tech 7 Sprockets and D.I.D chain brought to you by THS Moto. Note the chain may need to be adjusted to length using a chain breaker tool. This Sprocket Kit contains a 13 tooth front sprocket and 54 tooth rear Tech 7 sprocket with a 428VX136 136-Link 428VFJ X-Ring clip link DID Chain Fits: Yamaha AG125 2017-2021