Fits: Yamaha YZ250F 2003-11

crankshaft bottom end kit contains everything you need to complete your rebuild the right way, the first time- crankshaft and connecting rod, all applicable bearings, and complete bottom end gasket kit made to meet or exceed OEM

connecting rods are double forged from a dedicated forging and feature shot peening, oil slots, and coated bronze thrust washers; caged needle roller bearings to provide the highest possible RPM

Bottom end gasket kits are made from premium materials, exceeding OEM standards, to provide exceptional seal between critical mating surfaces; main bearings are case hardened for maximum life and smooth operation at high RPM’s

Top end of rod is bushed for oil retention and eliminates pin galling; the bottom end rod bores and crank pin bearings are case hardened to 58-62 RC to optimize bearing running surface and extend the lifetime of the assembly
The foundation of any bottom end rebuild is a solid forged crankshaft assembly, which provides strength and reliability far surpassing any cast part that lacks consistency. Forged crankshafts due to their lighter weight, more compact dimensions and better inherent dampening, rev higher and run smoother than their cast counterparts.This part of the engine has a huge amount of stress due to twisting and bending 1000’s of times a minute while running under load, you don’t want an inferior product here to ruin a motor. engineers have designed their crankshafts to meet or often exceed OEM tolerances giving you the best base for your bottom end. crankshaft bottom end kit contains everything you need to complete your rebuild the right way, the first time- crankshaft and connecting rod, all applicable bearings, and complete bottom end gasket kit made to meet or exceed OEM. connecting rods are double forged from a dedicated forging and feature shot peening, oil slots, and coated bronze thrust washers. Caged needle roller bearings to provide the highest possible RPM. Bottom end gasket kits are made from premium materials, exceeding OEM standards, to provide exceptional seal between critical mating surfaces. Main bearings are case hardened for maximum life and smooth operation at high RPM’s. Top end of rod is bushed for oil retention and eliminates pin galling. The bottom end rod bores and crank pin bearings are case hardened to 58-62 RC to optimize bearing running surface and extend the lifetime of the assembly. Fits: Yamaha YZ250F 2003-11.