Hot Rods 83-98 Yamaha YZ 250 250cc Wrist Pin Bearing

This wrist pin bearing is made from hot-rolled ASTM 4115 steel, a strong material chosen for its durability in high-stress engine components. It's then case-hardened to a hardness of 58-62 on the Rockwell C scale, which significantly increases the surface hardness to resist wear and deformation under the intense pressures and speeds experienced by the wrist pin in your Yamaha YZ 250's 250cc engine.

Properly supporting the wrist pin is crucial for the smooth operation and longevity of your engine. This bearing ensures that the connection between the piston and connecting rod is well-lubricated and can pivot freely without excessive friction or wear. The case-hardening process creates a tough outer shell while keeping the core material somewhat flexible, helping it withstand the constant pounding.