Kohler K662

Kohler K662The Kohler K662 is a 1,101 cc (67.20 cu·in) twin-cylinder air-cooled four-stroke internal combustion gasoline engine from K-series, manufactured by Kohler Co.

The Kohler K662 engine has an L-head (side valve) design, horizontal PTO-shaft, and pressurized lubrication system with a positive pressure oil pump. This engine is equipped with a downdraft carburetor and magneto ignition systems. The K662 engine used paper air cleaner (oiled foam pre-cleaner was available as an option) and full-flow type oil filter.

The cylinder bore is 92.0 mm (3.62 in) and the piston stroke is 82.5 mm (3.25 in). This engine produced 24.3 PS (17.9 kW; 24 HP) at 3,600 rpm of horsepower.

The breakdown of the engine code is as follows:

  • K – K-series
  • 66 – Approximate daisplacement (cu·in)
  • 2 – Twin cylinders
  • Suffix (engine is available with the following options):
    S – Electric starter;
    EP – Electric plant;
    Q – Quled model;

General information

Engine Specifications
Model K662
Type 4-stroke, L-head, twin-cylinders
Displacement 1,101 cm 3 (67.20 cu-in)
Max. horsepower 24.3 PS (17.9 kW; 24 HP) at 3,600 rpm
Max. torque (crank PTO)
Fuel system Downdraft carburetor
Cooling system Forced-air
Ignition system Magneto ignition system
Lubricating system Pressurized lubrication
Starting system
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke 92.0 X 82.5 mm (3.62 x 3.25 in)
Sleeve internal diameter 92.0877-92.0623 mm (3.6255-3.6245 in)
Piston skirt outer diameter 92.0496-92.0369 mm (3.624-3.6235 in)
Number of piston rings (compression / oil): 2 / 1
Ring end gap Top 0.254-0.508 mm (0.010-0.020 in)
Second 0.254-0.508 mm (0.010-0.020 in)
Connecting rod small end ID 22.2428-22.2504 mm (0.8757-0.876 in)
Piston pin outer diameter 22.2300-22.2352 mm (0.8752-0.8754 in)
Cylinder Head
Valve Arrangement: L-head (sidevalve)
Valves: 2

Tightening torque specs

Tightening torque specs
Cylinder head bolt 54 Nm; 5.55 kg·m; 40 ft·lb
Flywheel 176 Nm; 17.9 kg·m; 130 ft·lb
Spark plug 25-30 Nm; 2.55-3.06 kg·m; 18-22 ft·lb

Service Information

Max speed 3,600 rpm
Valve clearance
Intake valve clearance 0.15-0.20 mm (0.006-0.008 in)
Exhaust valve clearance 0.43-0.48 mm (0.017-0.019 in)
Oil system
Oil type API SF or SG
Recommended oil Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Oil capacity Without oil filter: 2.8 L (3.0 US. qt, 2.5 Imp. qt.)
With oil filter: 3.75 L (4.0 US. qt, 3.3 Imp. qt.)
Ignition system
Spark plug Champion: RCJ-8
Spark plug gap 0.65 mm (0.0256 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.


  1. I just wanted to say …thankyou for posting this information on your site….it has helped me alot on the k662 motor that i have on a 500 bobcat

    • Hey Jerry,my name is Terry. I too have a bobcat 500 unrestored,but i love it. I call it frankenstein, because i brought it back to life a couple of years ago. What part of the world do you live in? Thought maybe we could keep in touch every now and then to pick each others brain about our bobcats.

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