Wiseco WB1041 Bottom End Gasket Kit 2002-2010 Yamaha YZ85

The Wiseco WB1041 is a complete bottom end kit engineered for 2002–2010 Yamaha YZ85 engines. Each kit includes everything required to perform a thorough bottom end rebuild correctly the first time, with components manufactured to meet or exceed OEM specifications.

Kit Includes:

• Crankshaft and connecting rod assembly
• All applicable bearings
• Complete bottom end gasket set

Key Features:

• Double-forged connecting rod produced from a dedicated forging with shot peening for added strength and fatigue resistance
• Oil slots and coated bronze thrust washers for improved lubrication and reduced wear
• Bushed top end rod bore for superior oil retention and elimination of pin galling
• Case-hardened bottom end rod bores to 58–62 RC Rockwell for an optimized bearing running surface
• Premium crank pin bearings forged from hot-rolled steel and case hardened to 58–62 RC for extended service life
• Caged needle roller bearings engineered to support the highest possible RPM operation
• Main bearings manufactured to the highest quality standards, case hardened for maximum durability and smooth high-RPM performance
• Corrosion-resistant surface treatment on all components to prevent pitting and corrosion during long-term use or storage, extending assembly life and strength
• Premium gasket materials exceed OEM standards and deliver an exceptional seal across all critical mating surfaces

Wiseco bottom end kits are a trusted choice for motocross and off-road riders who demand reliable, race-proven performance from their engine rebuilds. Built with the same precision Wiseco applies to their top-end components, the WB1041 ensures your YZ85 is back on the track with confidence.