Motorcycle and ATV enthusiasts, this 40-piece carburetor jet kit has exactly what you need for tuning and repairs! The kit includes 30 main jets and 10 pilot jets that work with Keihin PE, PWK, CVK, OKO, KOSO, Polini, and other popular carburetor models. The main jets range from #100 to #178, and the pilot jets go from K32 to K55, giving you plenty of options for dialing in your fuel mixture perfectly. Made from premium brass with CNC precision, these jets offer corrosion resistance and exact dimensions for reliable performance. They're compatible with most 110cc-300cc dirt bikes, ATVs, go-karts, and motorcycles including Honda CRF models, Apollo, Tao Tao, SSR, and many Chinese-made machines. Whether you're dealing with poor performance at different altitudes, changing exhaust systems, or just need replacement jets for maintenance, this kit gives you all the sizes you're likely to need. The precise manufacturing means they'll fit right in without modification, and the brass construction ensures they'll hold up to fuel and heat. Keep your carburetor running optimally with this comprehensive jet collection that's way more affordable than buying individual jets from the dealer.