PISTON KIT 9-11 SX450 97.00 HC, ARMOR GLIDE HIGH COMP 13.5:1, WISECO 4938M09700 ATV

Part no 56-W4938.WI (phoenixmotos.com)
Wiseco 97.00mm piston kit Application KTM 450 SX (13.5:1 Comp) 09-11
(Wiseco part no 4938M09700)