TB Parts Maintenance Kit – KLX140

TB Parts Maintenance kit the smartest way to upgrade or rebuild your KLX140. Designed for riders installing a big bore or stroker crank, or rebuilding the bottom end, this kit bundles the most critical upgrades into one high-value package—saving time and money over buying parts individually.

What’s Included:

Lightweight Titanium Engine Cover Bolt Kit:

• 14-piece titanium bolt set

• Allen socket head design

• Lightweight, corrosion resistant

• Replaces OEM engine cover hardware

Heavy-Duty Starter Motor:

• Built for high-compression and big bore engines

• Manufactured in Japan

• Direct bolt-on replacement

• Works great on stock engines

Cam Bolt & Pin Kit:

• Reverse-thread cam bolt

• Includes cam pin

• Direct replacement for all KLX140 models

Center Case Bearing Kit

• Complete set of NTN transmission and shift drum bearings

• Includes replacement dowel pins and screws

• Ideal when splitting cases

HD Kevlar Clutch Kit:

• Kevlar friction plates

• Dimpled steel plates

• 15% stiffer springs

• Deletes OEM jitter components

Oil Filter:

• Essential maintenance item

• Helps extend engine life

170cc High-Compression Forged Big Bore Kit:

• Forged piston with rings, pin, and clips

• 63mm aluminum cylinder with steel sleeve

• Safe with 91+ octane pump fuel

• Compatible with stroker crank builds

Note: 2025+ KLX140s – require case boring to fit. Our cylinder skirt is 65.95mm 2025+ cases are only 65.4mm wide.

Why This Kit Works

This kit covers the most common wear and failure points when building power or refreshing a high-hour KLX140. The HD starter, clutch, bearings, and hardware are designed to handle increased compression and displacement, making it ideal for stroker installs or full bottom-end rebuilds.