Wiseco CSK038 Clutch Spring Kit for Yamaha YFZ450 2004-2006

The Wiseco CSK038 Clutch Spring Kit is a direct-replacement spring set engineered specifically for the Yamaha YFZ450 (2004–2006). Manufactured from premium steel and subjected to shot-peening and heat-treating processes, these springs deliver superior strength and long-lasting durability over standard OEM clutch springs.

Key Features:

• Premium steel construction — shot-peened and heat-treated for enhanced fatigue resistance and longevity
• Stiffer than stock — springs are approximately 8–10% stiffer than OEM to ensure positive, consistent clutch lockup
• Eliminates clutch slip — restores reliable clutch engagement and prevents power loss under hard acceleration
• OEM-quality fit — designed to meet exact factory specifications for a hassle-free drop-in installation
• Competition proven — Wiseco clutch components are trusted at every level of ATV and dirt bike competition

Whether you're rebuilding a worn clutch or upgrading for more demanding riding conditions, the Wiseco CSK038 spring kit is the reliable solution to keep your YFZ450 clutch performing at its best. Available as a standalone spring kit or paired with Wiseco's complete clutch pack and performance clutch kits for a full clutch refresh.