TB Parts KLX140 - 170cc Big Bore Kit w/Cam & Big Carb Kit

This Big Bore Performance Kit includes the following

• – Aluminum cylinder with steel sleeve (63mm)
• – High compression 63mm piston with rings, pin, & clips
• – Head gasket kit
• - Genuine Mikuni VM26 big carb kit
• - Throttle cable
• - Complete Jet Kit (Mains and Pilots included)
• - Performance Camshaft

- Arrow on piston is pointed towards exhaust valve relief. 

This affordable 170cc Big Bore Kit will make your KLX140 a lot more fun to ride by adding some much needed power.  

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

For 2024 and older models: This kit does not require boring of the case – simply bolt on and go!  

Included is the tried and trued Mikuni VM26 carb kit, this is a bolt on kit that works with the stock air boot so you can keep your stock airbox in place.  No messing with pod filters or rigging up a difference air boot to make it fit the stock airbox. Performance camshaft included for even more performance!   

There are no installation instructions, but if you can replace your piston, you can install this kit. If you don’t have any experience working on your engine, we highly recommend having a professional technician install this kit or, at a minimum, purchasing the shop manual for your bike available from your local Kawasaki dealer. The parts are installed in the same manner as the OEM parts. Your bike will also need to be re-jetted to provide the additional fuel this big bore kit will require to run properly.  We highly recommend professional installation and tuning.  

Have any questions or concerns ?  Please send us a message and we will gladly help with any questions you may have.  We have been in the motorcycle parts industry for over a decade and are here to help. 

We are an authorized TB Parts dealer - buy with confidence.