The 52mm 105cc Big Bore R Cylinder Kit Head Assembly for K, A, 50 Filly is an excellent upgrade for your K A 50 Filly bike. This head kit significantly enhances the power and performance of your bike while maintaining its durability. The Big Bore R Cylinder design allows for a larger combustion chamber, resulting in increased air intake and better fuel efficiency. This kit is designed for the K A 50 Filly series of motors, ensuring a perfect fit and smooth installation. With only 52mm, it's lightweight and compact, making it easy to install and maintain. Whether you're looking to boost your bike's power for racing or daily commuting, this head kit is a must-have for your K A 50 Filly.