Kohler CH20S:gasoline, 2-cylinder, air-cooled horizontal-shaft V-twin, used in 2005
Kohler CH21S:gasoline, 2-cylinder, air-cooled horizontal-shaft V-twin, used 2006-2008
Oil capacity:2 qts (1.9 L)
Torque CH20S:32.7 lb-ft (44.3 Nm)
Torque CH21S:36.2 lb-ft (49.1 Nm)
Kohler CH670S:gasoline, 2-cylinder, air-cooled horizontal-shaft V-twin, used 2008-2010
Starter CH20S:electric
Torque CH670S:36.2 lb-ft (49.1 Nm)
Engine options:20HP Kohler 624cc 2-cyl gasoline, 21HP Kohler 624cc 2-cyl gasoline, 22HP Kohler 671cc 2-cyl gasoline
Idle RPM CH20S:1400-3600
Idle RPM CH21S:1400-3600
Idle RPM CH670S:1400-3600
Rated RPM CH20S:3350
Rated RPM CH21S:3350
Rated RPM CH670S:3350
Torque RPM CH20S:2400
Torque RPM CH21S:2400
Bore/Stroke CH20S:3.03x2.64 inches (77 x 67 mm)
Bore/Stroke CH21S:3.03x2.64 inches (77 x 67 mm)
Torque RPM CH670S:2400
Bore/Stroke CH670S:3.15x2.64 inches (80 x 67 mm)
Displacement CH20S:624 cc (38.1 ci)
Displacement CH21S:624 cc (38.1 ci)
Displacement CH670S:671 cc (41 ci)
Oil change interval:100 h
Power (gross) CH20S:20 hp (14.9 kW)
Power (gross) CH21S:21 hp (15.7 kW)
Sparkplug gap CH20S:0.030 inches (0.762 mm)
Sparkplug gap CH21S:0.030 inches (0.762 mm)
Starter volts CH20S:12
Power (gross) CH670S:22 hp (16.4 kW)