You work your tail off 12+ hours a day. It's time to hold your engine to the same standard. With extended maintenance intervals and fuel-efficient operation, KOHLER Command PRO engines work as hard as you do. FEATURES Integrated oil coolers extend oil-change intervals and maintain low temperatures during the entire power range High-efficiency, heavy-duty air filters provide protection from debris and ensure longer service intervals Extra-large sleeve bearings support heavy loads in commercial and industrial environments SPECIFICATIONS Engine type: 4-cycle, gasoline, OHV, cast iron cylinder liners, aluminum block Model: Command PRO CH640 HP: 20.5 HP (15.3 kW) Displacement: 41.1 cu. in. (674 cc) Bore: 3.1 in. (80 mm) Stroke: 2.6 in. (67 mm) Gross Torque: 35.7ft. lb. (48.4 Nm) Compression Ratio: 8.5:1 Dry Weight: 9lb. 0 (41 kg) Oil Capacity: 2 US qt. (1.9 L) Lubrication: Full pressure w/full-flow filter Dimensions LxWxH: 14 x 17.7 x 19.0 in. Backpressure Limit 2: 50 Certified Power: 20.9 HP (15.6 kW) Certified RPM: 3600 Emissions Compliance: EPA Phase III; CARB Phase III; China Phase II; EU Stage V Engine Type: Commercial EQUIPMENT TYPES Concrete Trowel Concrete Saw Blower Stump Grinder Welder Wide-Area Walk-Behind Wood Chipper Zero-Turn Mower Riding Mower Pump Light Tower Generator Floor Buffer Curber Engine Type 4-cycle, gasoline, OHV, cast iron cylinder liners, aluminum block Bore x Stroke 3.1 x 2.6 in. Displacement 41.1 cc Compression Ratio 8.5:1 Horsepower 20.5 HP Torque 35.7 ft. lb. DIMENSIONS Length 14 in. Width 17.7 in. Height 19 in. Weight 90 lb.