Skip to product information
1 of 3


Wiseco Bottom End Kit - WPC133 - 2001-2005 Yamaha Raptor 660R YFM660R

Regular price $520.56 USD
Regular price $640.36 USD Sale price $520.56 USD
Sale Sold out

This Wiseco Bottom End Kit for WPC133 for the 2001-2005 Yamaha Raptor 660R YFM660R features a crankshaft, top end bearing, premium main bearings, and a bottom end gasket set with all seals and gaskets needed for installation. The double-forged Wiseco connecting rods are precision trued to OEM specifications and shot-peened for superior dimensional consistency, while the crank pin bearing radial running clearance is optimized to ensure maximum performance. Corrosion-resistant surface treatment and precision engineering ensure reliability and performance.


  • This Wiseco Bottom End Kit comes with a crankshaft, top end bearing, main bearing set, and a comprehensive gasket set with all the seals and gaskets needed for a rebuild.
  • Factory-assembled crankshafts are accurately calibrated to match OEM specs.
  • Wiseco connecting rods are double-forged for consistent grain structure, improving dimensional integrity.
  • Shot-peening reduces stress and creates a seamless finish on the crank forgers.
  • Corrosion-resistant surface treatment
  • Rod bores in both the top and bottom end are case hardened to a Rockwell hardness of 58-62 RC, ensuring improved bearing performance.
  • Radial running clearance of crank pin bearing optimized for peak performance.
  • Precision engineered oiling slots maximize rod strength and bearing life
  • Small ends with double-drilling offer the piston pin extra lubrication and cooling, minimizing top end distortion caused by thermal transfer from the piston.
  • Silver-coated bronze phosphor thrust washers, with dimpled design to increase oil retention and reduce friction between rod and washer interface
  • Crank pin bearings are crafted with hot rolled steel hardened to 58-62 Rockwell.
  • Caged needle roller bearings provide the highest possible rpm
  • Precision machined crank webs

Fitment - 2001-2005 Yamaha Raptor 660R YFM660R

Yamaha YRM660R Raptor Performance, Motocross, Sport - Quads / ATV

Moto-House MX - Choice of Champions - Located in Clermont/Groveland Fl. The Best Local Motocross shop in Central Florida

  • Moto-house MX Offers Free shipping over $65 dollars

    Free Shipping

    Orders over $65 Ship Free in the continental 48 States