Part Number: 61002-K01 For Models: 2008 - 2010 Polaris RANGER 800, 2008 - 2010 Polaris RZR 800, 2005 - 2010 Polaris SPORTSMAN 800 Compression Ratio (x:y): 10.2:1 Cylinder Diameter (mm): 82.00 Displacement (cc): 808.00 SizeOverStandard: 2.00