YOU ARE PURCHASING A BRAND NEW WISECO COMPLETE CRANKSHAFT REBUILD KIT FOR THE 2003-2020 YAMAHA YZ250/YZ250X.THIS KIT COMES COMPLETE WITH A NEW CRANKSHAFT,CRANK BEARINGS AND ALL BOTTOM END GASKETS TO DO A COMPLETE BOTTOM END REBUILD AT A FRACTION OF THE COST OF OEM PRICES.

Wiseco Crankshaft w/Bearings and Gaskets - WPC134

Precision-trued to OEM specifications and factory assembled

Connecting rods are double-forged to maintain superior dimensional consistency through improved grain flow

Shot-peening eliminates residual stresses and smoothly blends the rod forging surfaces

Corrosion-resistant surface treatment

Top and bottom end rod bores case hardened to 58-62 RC to optimize bearing running surface

Crank pin bearing radial running clearance is optimized to ensure maximum performance

Precision honing ensures ultra-round bearing surface

Precision-engineered oiling slots maximize rod strength and bearing life

Double-drilled small ends provide the piston pin with extra lubrication and cooling, reducing distortion of top end due to thermal transfer from the piston

Silver-coated bronze phosphor thrust washers with dimpled design increase oil retention and reduce friction between rod and washer interface

Crank pin bearings are manufactured with the highest-quality hot-rolled steel -- case hardened to 58-62 RC

Caged needle roller bearings provide the highest possible RPM

Precision-machined crank webs

Crankshaft comes with top-end bearing, premium main bearings and a complete bottom end gasket set that includes all seals and gaskets needed to do the job

Included Items:

(1) Crankshaft

(2) 28x68x18 Bearings

(1) Crankcase cover gasket

(1) Carburetor cover gasket

(1) Water pump cover gasket

(5) O-rings(assorted sizes)

(1) 36x55x10 Seal

(1) 27.5x55x10 Seal

(1) 20x40x7 Seal

(1) 32x42x6 Seal

(1) 20x30x5 Seal

(1) 18x30x6 Seal

(1) 12x22x5 Seal

(1) 12x16x5 Seal 

(1) 12x18x5 Seal

(1) 12x25x7 Seal

(1) 8x12x3 Seal

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