• 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.
  • ProX Piston Circlip (Sold in Pairs)
  • ProX Piston Kits (Sold each). Yamaha RD350/400/RZ350/RD350LC/RD350YPVS (all years). Piston kits include piston, rings, pin and clips. ProX pistons are manufactured in Japan and are designed to meet or exceed OEM specifications. Available sizes are 64.0mm, 64.25mm, 64.50mm, 64.75mm, 65.0mm, 65.25mm, 65.5mm. Note: Use of these pistons in air cooled RD350/400 require modification of the piston skirt. We can perform this service for you. You can purchase the piston modification service here on the site under the piston category. Choose piston size, quantity and click add to cart.
  • ProX Piston Ring Sets (ea) Yamaha RD350/400/RZ350/RD350LC/RD350YPVS (all years). Piston replacement ring sets for ProX pistons (sold each - enough for one piston). ProX pistons ring sets are manufactured in Japan and are designed to meet or exceed OEM specifications. Available sizes are 64.0mm,64.25mm,64.50mm,64.75mm,65.0mm,65.25mm,65.5mm. Choose ring size, quantity and click add to cart.
  • Vertex Piston Kits (Sold each). Yamaha RD350/400/RZ350/RD350LC/RD350YPVS (all years). Piston kits include piston, rings, pin and clips. Vertex pistons are manufactured in Italy and are designed to meet or exceed OEM specifications. Available sizes are 64.0mm, 64.25mm, 64.50mm, 64.75mm, 65.0mm, 65.5mm, 66.0mm. Note1: Pistons can be used in the models listed; however, use of these pistons in air cooled RD400 require modification of the piston skirt. Note2: Pistons can be used in the models listed; however, use of these pistons in the RD350 and LC350 require removal of the lower tab on the intake side of the piston. We can perform this services for you. You can purchase the Vertex piston modification services here on the site under the piston category. Choose piston size and click add to cart.
  • Wiseco Piston Kit Forged Pro-Lite for Yamaha RZ350 (All Years). Forged piston kit from Wiseco includes, Piston, Rings, Circlips, Wrist Pins. Sold each. Choose size and click add to cart.
  • Wiseco Top end bearing - RZ350
  • Wiseco Wrist Pin for Wiseco RD350/400 Pistons. 16mm/2.175"