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143cc Big Bore Kit by Rad Speed & Design
* Will Not Work on OEM Clutch Setups
2019+ version is now offered with optional O2 bung ready for those that are running the aRacer AF1/AF2 or the PV3 with auto tune function
The 1/4" vent tube allows air to flow in to the bottom of the container releasing the internal pressure resulting in a smooth and quick pour
Improves throttle response and increases the rev limit
170cc / 63mm Big Bore Kit - All KLX140 LaborDay22 143cc Big Bore Kit byTB Parts 170cc 63mm Big Bore Kit Fitment: Kawasaki KLX140 (2008 2020) Kawasaki KLX140G (2017 2020) Kawasaki KLX140L (2008 2020) Kawasaki KLX140R (2021 Present*) Kawasaki KLX140RF (2021 Present*) Kawasaki KLX140RL (2021 Present*) *Fitment Note: 2025+ KLX140s MAY require case boring to fit. Our cylinder skirt is 65. 95mm and SOME 2025+ cases are only 65. 4mm wide. This kit includes a lightweight high compression piston that is 5mm over stock making
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