Kohler SV590

Kohler SV590The Kohler SV590 is a 0.6 L (597 cc, 36.43 cu·in) natural aspirated single-cylinder four-stroke air-cooled small gasoline engine with a vertical shaft from the Courage series, manufactured by Kohler Co for general-purpose applications.

The cylinder bore is 94.0 mm (3.7 in) and the piston stroke is 86.0 mm (3.39 in). The compression ratio rating is 8.5:1.

The Kohler Courage SV590 engine produced 19.3 PS (14.2 kW; 19.0 HP) at 3,600 rpm of maximum output power and 44.7 N·m (4.6 kg·m, 32.9 ft·lb) of peak torque.

The Kohler SV590 features:

  • OHV design
  • Aluminum head and crankcase with cast iron cylinder liner
  • Micro-polished crankshaft bearings
  • Electronic ignition system
  • Carburetor with fixed main jet (Nikki or Walbro)
  • Centrifugal governor
  • Full pressure lubrication with full-flow filter
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine modelCourage SV590
Engine type4-stroke, OHV, single-cylinder
Displacement597 cm3, (36.43 cu·in)
Max. horsepower19.3 PS (14.2 kW; 19.0 HP) at 3,600 rpm
Max. torque44.7 N·m (4.6 kg·m, 32.9 ft·lb)
Cooling systemForced air
Air cleanerReplaceable, paper element
Lubricating systemPressurized lubrication
Ignition systemElectronic ignition system
Fuel systemCarburetor with fixed main jet (Nikki or Walbro)
Fuel consumption
Fuel tank capacity
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemElectric starter
Dimensions (L x W X H)493 x 416 x 328 mm (19.4 x 16.4 x 12.9 in)
Dry weight35.8 kg (78.9 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.5:1
Cylinder bore:94.0 mm (3.7 in)
Piston stroke:86.0 mm (3.39 in)
Cylinder internal diameter (standard):94.010-94.035 mm (3.7012-3.7022 in)
Number of piston rings (compression / oil):2/1
Piston pin diameter:21.995-22.000 mm (0.8659-0.8661 in)
Side clearance (Top):0.040 mm (0.0016 in)
Side clearance (Second):0.040 mm (0.0016 in)
Ring end gap (Top):0.150-0.400 mm (0.0059-0.0157 in)
Ring end gap (Second):0.300-0.550 mm (0.0118-0.0217 in)
Crankshaft main journal diameter: Before S/N 3703200003
Flywheel End: 44.913-44.935 mm (1.768-1.769 in)
PTO End: 41.913-41.935 mm (1.650-1.651 in)

After SN 3703200013
Flywheel End:44.870-44.895 mm (1.766-1.767 in)
PTO End: 41.855-41.880 mm (1.648-1.649 in)

Crankpin journal diameter:40.982-41.000 mm (1.6135-1.6142 in)
Crankshaft center distance:43 mm (1.695 in)
Cylinder head
Valve arrangement:OHV
Valve head diameter (INTAKE):37.375-37.625 mm (1.4715-1.4813 in)
Valve head diameter (EXHAUST):32.125-32.375 mm (1.2648-1.2746 in)
Valve steam diameter (INTAKE):5.982-6.000 mm (0.2355-0.2362 in)
Valve steam diameter (EXHAUST):5.970-5.988 mm (0.235-0.2357 in)

Service Data

Valve clearance
Intake valve lash:0.127 mm (0.005 in)
Exhaust valve lash:0.178 mm (0.007 in)
Oil system
Lubrication system:Pressurized lubrication
Oil type:SJ or higher
Recommended oil:SAE 10W-30
Oil capacity:1.5 L (1.59 US. qt, 1.32 Imp. qt.)
Fuel system
Type:Carburetor with fixed main jet (Nikki or Walbro)
Ignition system
Type:Electronic ignition system
Spark plug:Champion RC12YC
Spark plug gap:0.76 mm (0.0299 in)
Spark plug torque:27 N·m (2.8 kg·m, 19.9 ft·lb)

Tightening torque specifications

Valve clearance
Cylinder Head20.5-41.0 Nm (15-30 ft-lb)
Rocker Arm Pivot Stud13.5 Nm (10 ft-lb)
Rocker Arm Adjustment Nut Set Screw5.5 Nm (4.2 ft-lb)
Flywheel Retaining Screw66.5 Nm (49 ft-lb)
Connecting Rod Cap11.5 Nm (8.5 ft-lb)
Cam Lever7.5 Nm (5.4 ft-lb)
Oil Drain Plug14.0 Nm (10.4 ft-lb)
Fuel Bowl Retaining Screw Torque5.1-6.2 Nm (3.8-4.6 ft-lb)
Balance Weight Screw10.0 Nm (7.5 ft-lb)
Air Cleaner Base Mounting Screw8.0 Nm (5.8 ft-lb)
Electric Starter Mounting Nut3.6 Nm (2.7 ft-lb)
Ignition Module6.0 Nm (4.5 ft-lb)
Muffler Retaining Nuts24.4 Nm (18 ft-lb)
Oil Filter10-13 Nm (7.5-10.1 ft-lb)
Oil Pump Mounting Screw4.0 Nm (2.9 ft-lb)
Rectifier-Regulator Mounting Screw6.0 Nm (4.5 ft-lb)
Speed Control Bracket Assembly11.0 Nm (8.2 ft-lb)
Governor Control Lever7.0-8.5 Nm (5.2-6.3 ft-lb)


Manufacturer or BrandModels
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1. Kohler Courage SV470-SV620 service manual. Kohler Co. 2020.

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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