The clutch chain and sprockets are something that has to be kept pretty fresh so buying small parts of the drive train is like buying one new tire at a time for your car, the others will wear it out faster. Get everything new and take care of it the best you can will save money in the long run. The clutch should only get burned once per track session coming off the grid so nail it and it will lock up quick then keep speed up above clutch stall while on the track.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience