WSM Piston Kit - Yamaha 660 - Standard 50-544K Two-Piece Stealth Headlight System Stretch accordions on fingers and

Stretch accordions on fingers and thumb to increase flexibility and fit

Includes removable spark arrestor

2006 Yamaha YZ 250 F - - 2000-2002 Yamaha WR 426 F - - 2000-2002 Yamaha WR 250 F - - 2000-2002 Yamaha YZ 426 F - - 1998-2002 Yamaha WR 450 F - - 1998-2002 Yamaha WR 400 F - - 1998-1999 Yamaha YZ 400 F - - 1997-2002 Yamaha YZ 125 - - 1997-2002 Yamaha YZ 250

External finger and palm seams for a close fit and superior feel Printed logos for weight-saving and material integrity

WSM Piston Kit - Yamaha 660 - Standard 50-544K Two-Piece Stealth Headlight System Stretch accordions on fingers andQuality and construction that meets or exceeds OEM Feature improved E clip design Contain piston, rings, pin and clips Additional rings available separately Order one per cylinder Skirts have a nonabrasive, expansion retarding MOS2 coating to reduce heat and friction for added power and longevity MOS2 coating actually draws heat through piston walls and out the bottom Specially hardened tops add strength to ring grooves