250cc Motorcycle Transmission Gear Box Main Counter Shaft Kit For KEWS K23 YB250R Engine Pit Bike Atv Quad This transmission gear box main counter shaft kit is designed for 250cc engines used in bikes, pit bikes, ATVs, and.Compatible with KEWS K23 and YB250R engine models, the kit includes all necessary components for the main counter shaft assembly.It supports proper gear engagement and power transfer within the transmission system.The parts are engineered to meet specifications for fitment and function.Compatibility Disclaimer: This is not an OEM item.Mentioned brands/models are used strictly for fitment illustration.