If you’re a true Yamaha Banshee rider, tuner, or builder, the YZ250 325 Big Bore Kit represents a transformative upgrade that elevates your machine to a new realm of power, torque, and throttle response. Designed to fit perfectly on the iconic Banshee’s 2-stroke twin-cylinder platform, this kit leverages the proven YZ250 engine base, expanding displacement to 325cc per cylinder, yielding a staggering total of 650cc. The result? A Banshee that roars louder, accelerates harder, and delivers exceptional reliability for the toughest trail rides or the fiercest track battles.

Why Choose the YZ250 325 Big Bore Kit?

Unlike standard Banshee upgrades that offer incremental gains, this big bore kit is a complete cylinder replacement engineered by industry leaders for maximum output and longevity. Made from aerospace-grade CNC-machined aluminum alloy, it boasts superior heat dissipation and precision tolerances, ensuring a perfect fit and peak performance under extreme conditions. This upgrade is ideal for riders seeking to harness the raw potential of their 2-stroke powerhouse without compromising the classic Banshee style or throttle feel.