PISTON KIT 87-07 YFZ350 65.50, WISECO 513M06550RD350 82-90

Part no 56-W513+150_WI (phoenixmotos.com)
YAMAHA YFZ 350 BANSHEE 1987-2007,
Yamaha RD350 LC - YPVS (1980-1987),
Yamaha RD350 AC (1950-2014),
Namura 65.50mm piston kit

(Namura part no 513M06550)