KTM MJ rear sprocket for KTM 125 EXC Six Days 2007-2017 MJ Corse MJ.651 €46.52 High quality duraluminium (ergal) rear sprocket for KTM 125 EXC Six Days 2007-2017, with chain pitch 520 and with number of teeth from 38 to 58. Select the chain pitch and number of teeth you need by clicking below. Add to cart