WOSSNER PISTON KIT 01-04 YFM660 100 A, WOSSNER 8507DA YAMAHA ATV 3YF-11631-00-X0

Piston Kit 100mm Bore 99.93 Wossner 8507DA (STD)
YAMAHA
XTZ660 Tenere 1991 - 1998,
XTZ660 Raptor 1991 - 1998, ATV
YAMAHA
YFM660R Raptor 2001 - 2009,
YFM660F Grizzly 2001 - 2009, Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany. Part No. 56-W8507+00A.WO (oro2u.com)
Wossner Piston Yamaha XTZ660 Tenere/Raptor 100 mm Bore (PN# 8168DA)
Lock P/N CW22
Pin P/N WP017
Ring Set P/N 1000XSY Display (cm3) 660
Hub stroke (mm) 84.00
Clearance (mm) 0.07
Wossner compression Ratio: OEM
OEM Compression ratio: 9.20:1
Dome volume (cm3) -0.30
Compression height (mm) 27.00
Theorectical weight (G) Cross reference numbers ONLY.
3YF-11631-00-X0, 4966M10000, 01.2660.000