This Main Jet Kit is for our XR/CRF100 24mm Carb (Item #TBW0938 & #TBW0230)   This kit will give you a wide range of tuning ability for stock or modified XR/CRF100's. 

This Main Jet Kit is for the AFT XR/CRF100  24mm Carb  It includes the following sizes: # 85, 95, 100, 105, 110, 115, 120, 125, 130 & 135