Now youൈ€™ve got it with the KOHLER air-cooled, V-twin 7000 Series engine.Engine Type: Model KT725; Peak Torque lbs. ft (Nm) 40.4 (54.8) Compression Ratio: 9.1:1: Dry Weight lbs (kg) 85 (38.6) Oil Capacity U.S. quarts (L) 2 (1.9) How often should you change oil in Kohler 7000 Series? Well-Known Member. Yeah,,anywhere between 5 and 10 is acceptable,,25 would be the. Specs Engine Uses Service Engine Type Four-cycle, twin-cylinder, air-cooled, vertical shaft, gasoline, OHV, with cast iron liner. Model KT735 Power [1] kw (hp) 17.9 (24) Displacement mm 3 (in 3) 725 (44.2) Bore mm (in) 83 (3.3) Stroke mm (in) 67 (2.6) Gross Torque [1] Nm (lb-ft) 54.9 (40.5) Compression Ratio 9.1:1 Dry Weight kg (lbs) 38.6 (85).