In this category you will find all the smooth clutch disc kits we can have for your YAMAHA 4 stroke motocross like YZF, WRF, YZ250F, YZ450F, WR450F, WR250F,... Here you will find a wide range of clutches, whether it is an original type or a competition type clutch, you will find everything here. We work with brands such as TECNIUM which offers original type clutches reinforced but also with PROX or NEWFREN for example which will offer them clutch discs lined with competition for a better grip. How to know if you need to change your clutch ? The easiest way is to put it in 3 or 4 at low rpm and accelerate hard. If you feel that the bike is revving up but not moving faster then the clutch needs to be changed. Often it's only the discs that don't grip anymore. But if when you disassemble your clutch you see that the smooth discs are warped, heated,... Then we strongly advise you to take a complete clutch kit with the smooth discs.