WISECO - Crankshaft Kit (ref. WWPC133) for Yamaha Raptor 660. This complete kit includes the factory-assembled crankshaft and all the necessary components for engine replacement on quads: upper bearing, OEM quality main bearings, and a complete set of lower gaskets. Suitable for YFM 660 RAPTOR 2WD (2003, 2004, 2005).
- Only one part number to stock and order to simplify maintenance.
- Factory-assembled and precisely ground crankshaft according to OEM specifications.
- Double-forged connecting rod with shot peening for dimensional consistency and reduced residual stresses.
- Corrosion-resistant surface treatment and high-hardness (58-62 RC) cemented connecting rod bores to optimize bearing surfaces.
- Optimized radial clearance of the bearings and precision honing for an ultra-smooth bearing surface.
- Lubrication grooves and double-drilled small ends for increased lubrication and cooling of the piston pin.
- Bronze stop washers coated with silver and dimpled for better oil retention and reduced friction.
- High-quality crankpin bearings and needle cages to withstand engine RPMs.
- Wiseco gasket kits made from premium materials to ensure sealing and reliability.
A set designed for complete crankshaft builds and replacements, favored by Raptor owners seeking an OEM part suitable for the quad world.