The PROX Precision Engine Component provides precision-engineered performance for Engine & Components applications. *OEM Specification:* Engine Rebuild Kit - Standard Bore - Polaris. Key Specifications & Features - Bore - Oversize: Standard - Piston Material: Cast - Product Name: Rebuild Kit - Riding Style: UTV - Type: Engine - Engine Type: 4-Stroke - Skirt Coating: Moly Coated - Displacement: 760 cc - Units: Kit - Bore Size: 80.00 mm - Compression Ratio: 10.0:1 - Cooling System: Liquid Cooled - Available Configurations: ENG KT PROX POL800 05 STD, ENG KT PROX RZR800 11 STD, PSTN KT SD 850 ETEC 17-20, PSTN KT POLARIS 850 19+, PISTN KT SJ700 94-12 81MM, PISTN KT SJ700 94-12 81.5, PISTN KT TS/JR/LT50 41MM, PSTN KT 50SX 01-08 39.46M (+2 more options)