Kohler MV20

Kohler MV20The Kohler Magnum MV20 is a 770 cc, (46.98 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion small gasoline engine with a vertical PTO-shaft, for general-purpose applications.

Cylinder bore is 79.2 mm (3.12 in) and piston stroke is 77.7 mm (3.06 in). The compression ratio rating is 6.0:1. The Kohler MV20 engine produced 20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm of maximum output power.

The Kohler MV20 features:

  • L-head design
  • Electronic magneto ignition system
  • Walbro carburetor
  • Centrifugal governor
  • Full pressure lubrication system with oil filter
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine modelMagnum MV20/MV20S
Engine type4-stroke, L-head, V-twin
Displacement770 cm3, (46.98 cu·in)
Max. horsepower20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm
Max. torque
Cooling systemForced air
Air cleanerReplaceable, paper element
Lubricating systemFull pressure with oil filter
Ignition systemElectronic magneto ignition system
Fuel systemWalbro carburetor
Fuel consumption
Fuel tank capacity
Fuel usedGasoline (octane number 86 or higher)
Starting systemElectric starter, 12V
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)517 x 454 x 403 mm (20.4 x 17.9 x 15.8 in)
Dry weight58.9 kg (130.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:6.6:1
Cylinder bore:79.2 mm (3.12 in)
Piston stroke:77.7 mm (3.06 in)
Cylinder internal diameter (standard):79.362-79.388 mm (3.1245-3.1255 in)
Piston skirt outer diameter (standard):79.256-79.273 mm (3.1203-3.1210 in)
Number of piston rings (compression / oil):2/1
Piston pin diameter:19.047-19.052 mm (0.7499-0.7501 in)
Side clearance (Top):0.1518 mm (0.006 in)
Side clearance (Second):0.1518 mm (0.006 in)
Ring end gap (Top):0.2530-0.5820 mm (0.01-0.0229 in)
Ring end gap (Second):0.2530-0.5820 mm (0.01-0.0229 in)
Main bearing surface (max):44.213 mm (1.7407 in)
Crankpin outer diemeter:38.082-38.095 mm (1.4993-1.4998 in)
Cylinder head
Valve arrangement:L-head
Valves:2,(4 valves in total)
Valve head diameter (INTAKE):34.798-35.052 mm (1.370-1.380 in)
Valve head diameter (EXHAUST):34.798-35.052 mm (1.370-1.380 in)
Valve steam diameter (INTAKE):7.881 mm (0.3103 in)
Valve steam diameter (EXHAUST):7.843 mm (0.3088 in)
Valve Minimum Lift-Zero Lash (INTAKE):6.9 mm (0.274 in)
Valve Minimum Lift-Zero Lash (EXHAUST):6.9 mm (0.274 in)

Tightening torque settings:

  • Cylinder Head: 20.0-27.0 Nm; 15.0-20.0 ft·lb;
  • Connecting Rods (New): 16.0 Nm; 12.0 ft·lb;
  • Connecting Rods (Used): 11.0 Nm; 8.3 ft·lb;
  • Flywheel Screw: 54.0 Nm; 40.0 ft·lb;
  • Manifold Screw/Nut: 17 Nm; 12.5 ft·lb;
  • Fuel Pump Mounting Screws: 4.2-5.1 Nm; 3.1-3.8 ft·lb
  • Ignition Module: 3.6 Nm; 2.7 ft·lb
  • Spark Plugs: 18 Nm; 13.3 ft·lb
  • Oil Filter: 5.7-9.1 Nm; 4.2-6.7 ft·lb
  • Closure Plate: 17.0 Nm; 12.5 ft·lb

Service Data

Valve clearance
Intake valve clearance:0.076-0.152 mm (0.003-0.006 in)
Exhaust valve clearance: S/n 1816500646 and earlier: 0.406-0.482 mm (0.016-0.019 in)
S/n 1816500656 to 1917809286: 0.278-0.354 mm (0.011-0.014 in)
S/n 1917809296 and later: 0.330-0.406 mm (0.013-0.016 in)
Oil system
Lubrication system:Full pressure with oil filter
Oil filterFull-flow type
Oil type:SF or SG
Recommended oil:5W-20, 5W-30, 10W-30, 10W-40
Oil capacity: With oil filter: 1.9 liters (2.0 US.qts, 1.67 Imp. qts)
Oil pressure:More then 3.5 kg/cm2, 50 psi
Fuel system
Fuel pump typeMechanical
Fuel filter typeIn-line
Type:Walbro carburetor
Main fuel: Walbro (fixed jet): Not adjust
Walbro (adjustable jet): 1 turn
Low idle:1-1/4 turns
Ignition system
Type:Electronic magneto ignition system
Spark plug:Champion RV15YC
Spark plug gap:0.63 mm (0.025 in)
Spark plug torque:18 N·m (1.8 kg·m, 13.3 ft·lb)
Ignition coil air gap0.2-0.3 mm (0.008-0.012 in)

References

1. Kohler Magnum MV16, MV18, MV20 Twin cylinder engine service manual. Kohler Co.

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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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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