Features: Kit includes piston, rings, pin, clips, and top end gasket kit (what is pictured is what you get). Cast piston has ultra-high silicone content for added strength. Piston skirts are molybdenum and Teflon coated to minimize drag/wear and provide longer life. Piston dome is anodized for superior heat resistance and longer life. Gaskets are made from high performance materials to improve durability and provide greater reliability. Kit includes all gaskets pictured to rebuild the top end. Kit is for the stock bore size – 83.00mm. Piston – 82.95mm. All components in this kit are ready to install with bolt-on parts for a hassle free installation. Features: Condition: 100% Brand New from the Aftermarket Quantity: 1 Set Piston Material: Forged Aluminum Actual Displacement: 348cc cm Bore Size: STD 83mm Piston Diameter: 82.95mm Piston Height: 58.8mm Piston Pin Diameter: 19mm Piston Pin Height: 65mm Piston Stroke: 64.50mm Supersedes Part Number: Cylinder: 1UY-11310-03-00, 5YT-11310-00-00, 4WU-11310-00-00 Piston: 1YW-11631-01-Y0 Piston Pin: 55V-11633-00-00 Piston Ring Set: 4GB-11610-00-00 Cylinder Head Gasket: 1UY-11181-01-00 Base Gasket: 4KB-11351-00-00 2x Snap Rings Rings: 93450-19095-00 Fitment: Fits Yamaha Big Bear 350 4×4 (YFM350FW) 1987 – 1999 Fits Yamaha Big Bear 350 2×4 (YFM350U) 1996 – 1999 Fits Yamaha Bruin 350 4×4 (YFM350FA) 2004 – 2006 Fits Yamaha Bruin 350 2×4 (YFM350A) 2004 – 2006 Fits Yamaha Grizzly 350 2×4 (YFM350G) 2007 – 2011 Fits Yamaha Grizzly 350 4×4 (YFM350FG) 2007 – 2014 Fits Yamaha Grizzly 350 4×4 IRS (YFM350FGI) 2007 – 2011 Fits Yamaha Moto-4 350 (YFM350ER) 1987 – 1995 Fits Yamaha Raptor 350 (YFM350R) 2004 – 2013 Fits Yamaha Warrior 350 (YFM350X) 1987 – 2004 Fits Yamaha Wolverine 350 4×4 (YFM350FX) 1995 – 2005 Fits Yamaha Wolverine 350 2×4 (YFM350X) 2006 – 2009 (Compatibility Chart (FOR REFERENCE ONLY!!!) (Please compare with your faulty block and the picture we provided to determine the fitment) Kit includes: 1x Cylinder 1x Piston 1x ring set 1x piston pin 2x retaining rings 1x intake manifold gasket 1x cylinder head gasket 1x cylinder base gasket