Kohler SV471

Kohler SV471The Kohler SV471 is a single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Courage series, manufactured by Kohler Co. The displacement of this engine is 477 cc (29.1 cu·in) for models SV471-00XX, 535 cc, (32.6 cu·in) for models SV471-01XX or 597 cc, (36.4 cu·in) for models SV471-02XX and higher.

The Kohler SV471 engine has an OHV (overhead valve) design, aluminum head and crankcase with cast iron cylinder liner, micro-polished crankshaft bearings, vertical PTO-shaft, and pressurized lubrication system. This engine is equipped with a carburetor with a fixed main jet and an electronic ignition system.

The cylinder bore is 84.0 mm (3.30 in) for SV471-00XX engines, 89.0 mm (3.50 in) for SV471-01X engines, or 94.0 mm (3.70 in) for models SV471-02XX and higher. The piston stroke is 86.0 mm (3.39 in) for all versions. The compression ratio rating is 8.5:1. The SV471 engine produced 15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm of horsepower and 36.6 Nm (3.73 kg·m; 27.0 ft·lb) of torque.

The breakdown of the engine code is as follows:

  • S – Courage series
  • V – Vertical PTO shaft
  • 471 – Numerical designation

General information

Engine Specifications
ModelCourage SV471
Type4-stroke, OHV, single-cylinder
Displacement SV471-00XX: 477 cm3 (29.1 cu·in)
SV471-01XX: 535 cm3 (32.6 cu·in)
SV471-02XX and higher: 597 cm3 (36.4 cu-in)
Max. horsepower15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm
Max. torque36.6 Nm (3.73 kg·m; 27.0 ft·lb)
Fuel systemCarburetor with a fixed main jet
Cooling systemForced-air
Ignition systemElectronic ignition system
Lubricating systemPressurized lubrication
Starting systemElectric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio:8.5:1
Bore x Stroke SV471-00XX: 84.0 X 86.0 mm (3.30 x 3.39 in)
SV471-01XX: 89.0 X 86.0 mm (3.50 x 3.39 in)
SV471-02XX and higher: 94.0 X 86.0 mm (3.70 x 3.39 in)
Sleeve internal diameter SV471-00XX: 84.010-84.035 mm (3.307-3.308 in.)
SV471-01XX: 89.010-89.035 mm (3.504-3.505 in.)
SV471-02XX and higher: 94.010-94.035 mm (3.701-3.702 in)
Number of piston rings (compression / oil):2 / 1
Piston pin outer diameter21.995-22.000 mm (0.8659-0.8661 in)
Main journal diameterFlywheel End Before S/N 3703200003: 44.913-44.935 mm (1.7682-1.7691 in)
After S/N 3703200013: 44.870-44.895 mm (1.7665-1.7675 in)
PTO End Before S/N 3703200003: 41.913-41.935 mm (1.6501-1.6510 in)
After S/N 3703200013: 41.855-41.880 mm (1.6478-1.6488 in)
Cylinder Head
Valve Arrangement:OHV
Valves:2 (2 per cylinder)
Valve head diameter:INTAKE37.375-37.625 mm (1.4715-1.4813 in)
EXHAUST32.125-32.375 mm (1.2648-1.2746 in)
Stem outer diameter:INTAKE5.982-6.000 mm (0.2355-0.2362 in)
EXHAUST5.970-5.988 mm (0.235-0.2357 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt Step 1: 20.5 Nm (2.1 kg·m; 15.1 ft·lb)
Step 2: 41.0 Nm (4.2 kg·m; 30.3 ft·lb)
Flywheel M12: 88.0 Nm (9.0 kg·m; 65.0 ft·lb)
M10: 66.5 Nm (6.7 kg·m; 48.7 ft·lb)
Spark plug27 Nm (2.75 kg·m; 20.0 ft·lb)

Service Information

Valve clearance
Intake valve clearance0.127 mm (0.005 in)
Exhaust valve clearance0.178 mm (0.007 in)
Oil system
Oil typeAPI SJ or higher
Recommended oilSAE 10W-30
Oil capacity1.5 L (1.59 US. qt, 1.32 Imp. qt.)
Ignition system
Spark plugChampion RC12YC
Spark plug gap0.76 mm (0.030 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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