Kart Racing Classes Class Combined Weight Tires Minimum Age Kid Kart/Comer 50 150 lbs. Bridgestone YLC/YKC 5-8 Super Junior II Briggs 250 lbs. Bridgestone YLC/YKC 8-11 Comer 80 225 lbs. Bridgestone YLC/YKC 8-11 Rotax MicroMax 235 lbs. Bridgestone YLC/YKC 8-11 KPV 1 240 lbs. Bridgestone YLC/YKC 8-11 Jr. Super Sportsman 300 lbs. Bridgestone YLC/YKC 12-15 KT-100 350 lbs. Bridgestone YLC/YKC Over 16 Formula Y 330 lbs. Bridgestone YLC/YKC Over 16 World Formula 360 lbs. Bridgestone YLC/YKC Over 16 80 Shifter 360 lbs. Bridgestone YLC/YKC Over 16 w/ License 125 Mod Moto/ICC Shifter 400 lbs. Bridgestone YLC/YKC Over 16 w/ License 125 Stock Moto Shifter 375 lbs. Bridgestone YLC/YKC Over 16 w/ License TaG Senior Leopard/Rotax 370 lbs. Bridgestone YLC/YKC Over 16 w/ License TaG Heavy Leopard/Rotax 420 lbs. Bridgestone YLC/YKC Over 16 w/ License Racing Rules All Track Configurations Download Membership Application Download 2011 SOK Poster