Yamaha YFZ450 YFZ 450 98mm 12.5:1 CP Carrillo BIG BORE Pump Gas Piston Ring Kit WR250X They are designed for stock

They are designed for stock 74mm cylinders with standard bore

Wiseco CP or JE forged stock bore pistons**

MLS multi layer steel

Fits 2009–2024 EFI models

Includes 6 bearings total

Yamaha YFZ450 YFZ 450 98mm 12.5:1 CP Carrillo BIG BORE Pump Gas Piston Ring Kit WR250X They are designed for stockM1009, M1002, M1000, C7908, H2477027S, 2S2 11181 00 00 2S2 11181 00 00 2S2 11351 00 00 3VD 14613 0100, 99999 03528 00, 5TG 11631 12 00, 2S2 11181 00 00, 2S2 11351 00 00, 3VD 14613 01 00, 99999 03528 00, 5TG 11631 12 00, M1000, C7908, H2477027S, 2S2 11181 00 00, M1000, 4865M09500, M1100, 247956, 8784DA, 4835M09500 Turbocharge your YFZ450 YFZ450R YFZ450X with this high performance piston upgrade! This 98mm 12. 5: 1 CP Carrillo piston kit. CP Carrillo