Wossner is Germany's finest aftermarket forged piston and rod manufacturer and have over 25 years of experience in the high-performance racing industry. Top European racers and FIM World Champions rely on Wossner for only the best pistons, rods and customer service.Features In-house designed and manufactured; all forgings are produced in Wossner's company-owned forging operation 4-stroke pistons are made using a double-bridged forging design Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine All pistons include piston, ring, wrist pin and pin locks Wossner pistons are used by leading Supercross, Arenacross and MX GP teams Made in Germany Specifications Piston Size: 47.46mm Oversize: +0.01mm Number of Rings: 1 Replacement Rings: RSB4750 Replacement Wrist Pin: WP058 Replacement Circlip: CW14 Replacement Needle Bearing: N1006 Fits: Yamaha YZ85 Small Wheel 2002-2006 2008-2021 YZ85L Big Wheel 2002 2004 2006-2009 2011-2018 2021