Compatible with Piston: Yamaha 4GB-11638-00-00, 4GB-11636-00-00, 4GB-11631-00-Y0 Compatible with OEM Gasket Base Gasket: Yamaha 4KB-11351-00-00, 3GD-11351-00-00, Head Gasket: Yamaha 1UY-11181-01-00, 1UY-11181-00-00 Compatible with Yamaha 2000-2004 Big Bear 400 2x4, 2000-2012 Big Bear 400 4X4 Compatible with Yamaha 1993-1998 Kodiak 400 High-Quality Cast Aluminum Piston for Superior Strength to Weight Ratio, 83mm Bore, 8.61 Compression Ratio Included Items in This Bundle:

(QTY 1) NICHE 519-KGS2221K Cylinder Head & Base Gasket Kit

Substitute For OEM Part Numbers(s): 4KB-11351-00-00, 3GD-11351-00-00, 1UY-11181-01-00, 1UY-11181-00-00

(QTY 1) NICHE 519-KPS2221T Piston Kit

Substitute For OEM Part Numbers(s): 4GB-11638-00-00, 4GB-11636-00-00, 4GB-11631-00-Y0

Fits The Following OEM Models:

Yamaha Big Bear 400 2WD: 2000-2004
Yamaha Big Bear 400 4X4: 2000-2006
Yamaha Big Bear 400 Exploring Edition IRS 4X4: 2007
Yamaha Big Bear 400 Hunter Edition 4X4: 2000-2012
Yamaha Big Bear 400 IRS 4X4: 2007-2012
Yamaha Kodiak 400 4X4: 1993-1999