PISTON KIT 01-05 YFM660 100 HC, WISECO 4737M10000 YAMAHA ATV

Part no 56-W4737.HC_WI (phoenixmotos.com)
Wiseco 100mm piston kit
Application
YAMAHA
YFM660R Raptor (11:1 Hi - Comp) 01-05

YFM660F Grizzly 02-09
YXR660F Rhino 05-06
Wiseco part no 4737M10000