Wiseco WPC138 Bottom End Kit – Honda CRF450R 2002-2007

450 power. Zero weak links.
The Wiseco WPC138 is a complete bottom-end rebuild kit for 2002–2007 Honda CRF450R. Double-forged, factory-trued crank with premium main bearings, full gasket set, and every seal — built to handle big bores and high-compression builds. We price-match reputable online stores—contact us to ensure you get the best deal!

What’s Included

• Wiseco WPC138 Crankshaft Assembly (factory trued)

• Premium caged main bearings

• Complete bottom-end gasket kit (head, base, crank seals, o-rings)

• All transmission & water pump seals

• Ready-to-install — no missing pieces

Key Features

• Double-forged Wiseco rod — unmatched strength for 450cc torque

• Shot-peened & corrosion-treated — eliminates stress, extends life

• Precision oiling slots — max rod lubrication + piston cooling

• Optimized bearing clearance — supports high-RPM, big-bore racing

• Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Fitment

• Honda CRF450R

  • 2002

  • 2003

  • 2004

  • 2005

  • 2006

  • 2007

• Note: Confirm crank part number (ends in -000 or -001) before install.

$624.95

SKU: WPC138
Weight: 14.97 lbs
Package: 18.75" × 11.00" × 7.50" (estimated)
Same-day shipping if ordered by 3 PM EST

Installation Tips

1. Torque mains: 22–25 ft-lbs (Honda spec)

2. Use assembly lube on all bearings & seals

3. Check runout (<0.002") after install

4. Break in gently — 7–10 easy heat cycles