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50-80cc (24-32:1) | 125cc (24-40:1) | 250cc (24-40:1) | 500cc and up (32-60:1)
Renthal Twinwall: 998 Renthal 7/8": 966 (MM) Pro Taper: Henry/ Reed
Yamaha YZ125/250 2001-2007
KTM 85 SX 2013 - 2023
YZ250 99-22 SUZUKI RM250 03-12 Pro-X PROX PISTON KIT 66.37MM 01.2321.C 85SX.TC85 50-80cc (24-32:1) | 125cc (24-40:1)Made in Japan Part Number: 01. 2321. C Piston size: 66. 37mm Fitment: Suzuki RM250 2003 2012 Yamaha YZ250 1999 2022 Yamaha YZ250X 2016 2022 ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low expansion, low friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your Motorcycle, Scooter, Moped, ATV,