Replace or upgrade your worn chain and sprockets with this market leading sprocket kit featuring quality JT 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 JT sprocket and 50 tooth rear JT sprocket with a DID economy 520DZ114G chain 114-Link 520DZ2 solid bush Gold & Black clip link DID Chain Fits: Yamaha WR450F 2007-2011 YZ450FX 2016-2021