DESCRIPTION Unleash the muscle of Confidant.™ Designed to get the job done reliably, Confidant engines are battle-tested to meet KOHLER Command PRO® durability tests. They feature a 3 year, unlimited hour, limited warranty. FEATURES Cast-iron cylinder bores protect under dirty conditions High-impact nylon shroud and valve cover protect against damage to internal components Chopper grass screen guard prevents grass and debris packing Heavy-duty air cleaner and stamped steel guard stand up to tough mowing conditions Pressure lubrication and cooler operation help extend engine life SPECIFICATIONS Engine type: Four-cycle, twin-cylinder, air-cooled, vertical shaft, gasoline, OHV, with cast iron liner. Model: ZT720 HP: 21 HP (15.7 kW) Displacement: 44.2 cu. in. (725 cc) Bore: 3.3 in. (83 mm) Stroke: 2.6 in. (67 mm) Gross Torque: 40.7 ft. lb. (55.2 Nm) Compression Ratio: 9.1:1 Dry Weight: 91 lb. (41.3 kg) Oil Capacity: 2 (1.9) Lubrication: Pressure lubrication w/full flow filter Dimensions LxWxH: 18.8 x 17.5 x 17 in. Backpressure Limit 2: 50 Certified Power: 20.3 HP (15.2 kW) Certified RPM: 3600 Emissions Compliance: EU Stage V; China Phase II; CARB Phase III; EPA Phase III Engine Type: Commercial EQUIPMENT TYPES Commercial Zero Turn Mower Residential Zero Turn Mower Commercial Wide Area Walk Behind Mower Residential Rider ENGINE Engine Type Four-cycle, twin-cylinder, air-cooled, vertical shaft, gasoline, OHV, with cast iron liner. Bore x Stroke 3.3 x 2.6 in. Displacement 44.2 cc Compression Ratio 9.1:1 Horsepower 21 HP Torque 40.7 ft. lb DIMENSIONS Length 18.8 in. Width 17.5 in. Height 17 in. Weight 91 lb.