9 Best Big Bore Kits for 400EX in 2027
You can upgrade your Honda 400EX with top big bore kits like NICHE’s 440cc, GOOFIT’s 89mm 440cc, and Tupo’s 85mm cylinder, each boosting power and durability.
These kits fit models from 1996-2014, offering precise installation with high-quality aluminum and Nikasil coatings for lasting performance.
Whether you’re restoring or enhancing your ride, these kits improve efficiency and engine life. Keep exploring to find the perfect fit and detailed benefits for your setup.