Athena Big Bore Kit - RZ350/Banshee. Kit inlcudes: 2 aluminum 68mm cylinders with nickle carbide (nikasil) coating with large water jackets, high performance 68mm matched cast lite pistons kit includes rings, pin, clips, gasket kit, modular head with combustion domes with preconfigured squish and compression, cylinder studs, headbolts & washers, instructions included. CNC machined parts, true bolt on performance no modifications or machining needed. 68mm/392cc. 50+ rear wheel HP at 8k revs on stock crank/exhaust. Note for RZ350 installation: eliminates powervalves & requires modified exhaust (spigot type). Requires 2 Banshee water plugs, part no 47X-11355-00-00 available here on the site.