This high-quality valve spring from Xceldyne is the perfect upgrade for your Yamaha YZ450 bike from 2010-2013. Made in the United States with precision and care, this valve spring is designed to provide maximum performance and durability for your engine. Whether you're a professional racer or a weekend rider, this valve spring will help your bike perform at its best. With a focus on quality and reliability, Xceldyne has become a trusted name in the world of engine upgrades and performance parts. This valve spring, part number X2MX4302, is no exception. So why wait? Upgrade your Yamaha YZ450 today and feel the difference this valve spring can make.