Take your Honda TRX 300 4×4 to the pinnacle of performance with our CPPBB400 Big Bore Kit, the ultimate upgrade for enthusiasts seeking unmatched power and capability. Elevating your ATV’s engine displacement to a staggering 400cc, this kit represents the pinnacle of performance enhancement for the TRX300 4×4.

Engineered for peak performance, our CPPBB400 Big Bore Kit features a meticulously crafted forged Carrillo piston, ensuring exceptional durability and reliability under even the most demanding conditions. With a compression ratio tailored to 11.5:1, this kit maximizes power output while maintaining efficient combustion for an exhilarating ride every time.

As part of our Stage 3 kit, we recommend additional upgrades such as fuel tuning or a larger carburetor to fully optimize performance. Additionally, an aftermarket oil cooler is highly recommended to help manage engine temperatures and ensure long-term reliability.

Unleash the full potential of your TRX 300 4×4 with our CPPBB400 Big Bore Kit. Dominate any terrain with confidence and experience the thrill of uncompromising performance like never before.

please call for any tuning questions