Wiseco Top & Bottom End Yamaha 2003-2018 YZ 250 Engine Rebuild Kit Crank/Piston

Description

Wiseco Top & Bottom End Rebuild Kit
Please measure your cylinder bore before ordering
Fits: 200
3
-2018 Yamaha YZ250
66.4 mm Bore
(stock)
Top End:
2-stroke kits feature Pro-Lite™ pistons that are CNC machined for optimal cam shape and profile for peak HP and service life.
Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Superbike, and more.
Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy.
High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power.
Contents:
2614CD - 66.40 MM RING SET (DUAL)
804M06640 - Yamaha YZ250 1999-2015
B1003 - TOP END BEARING 18 X 22 X 21.8mm
CW18 - ROUND WIRE PIN LOCKS 18MM (PAIR)
S508 - PIN-18MM X 2.1062"-UNCHROMED-*2 CY*
W5978 or alternate - GASKET KIT-YAMAHA YZ250 '03-16
Bott
om End
:
Each 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.
Wiseco connecting rods are double forged from a dedicated forging and feature shot peening, oil slots, and coated bronze thrust washers.
Bottom end gasket kits are made from premium materials, exceeding OEM standards, to provide exceptional seal between critical mating surfaces.
Main bearings are manufactured to the highest quality standards. Each is case hardened for maximum life and smooth operation at high RPM’s.
Corrosion resistant surface treatment to prevent corrosion and pitting over long term use or storage. This will add to the life as well the strength of the assembly.
Top end of rod is bushed for oil retention and eliminates pin galling. The bottom end rod bores are case hardened to 58-62 RC to optimize bearing running surface.
The crank pin bearings are manufactured from the highest quality, hot rolled steel case hardened to 58-62 RC to extend the lifetime of the assembly.
Caged needle roller bearings to provide the highest possible RPM.
Questions
?
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