The KEIHIN Main Jet (Series 99101-357) by PROX is designed for use in KEIHIN carburetors. This essential component plays a critical role in optimizing the fuel mixture, ensuring your engine runs smoothly and efficiently. Made from high-quality materials, it provides excellent durability and performance. Whether you're fine-tuning your engine for the race track or ensuring peak performance for daily rides, this main jet is an ideal choice. Compatible with various KEIHIN carburetor models, it offers easy installation and reliability you can trust. Elevate your engine's performance with the KEIHIN Main Jet by PROX.