The MILLENNIUM M-Spec Big Bore Cylinder Kit is constructed from cast aluminum and features a nickel-silicon carbide bore coating. Designed for ATV and UTV applications, this +5.00 mm oversize kit increases the bore size to 104.00 mm, resulting in a 625 cc displacement with a 10.2:1 compression ratio. The kit is compatible with Polaris 570 platforms and is available in configurations for RZR 570, 800, 900, and 1000 models.
Each unit is supplied as a complete assembly that includes the cylinder, a piston kit, and a top-end gasket kit. This configuration provides the necessary components for a full top-end rebuild, ensuring all critical sealing and mechanical parts are included for the specified big bore installation.