The Kohler K321 is a 512 cc (31.24 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from K-series, manufactured by Kohler Co.
The Kohler K321 engine has an L-head (side valve) design and horizontal PTO-shaft. This engine can be equipped with Kohler or Walbro carburetor and magneto, battery or breakerless ignition systems. The K321 engine used paper air cleaner (oiled foam pre-cleaner was available as an option).
The cylinder bore is 88.9 mm (3.5 in) and the piston stroke is 82.6 mm (3.25 in). This engine produced 14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm of horsepower.
The breakdown of the engine code is as follows:
- K – K-series
- 32 – Approximate daisplacement (cu·in)
- 1 – Single cylinder
- Suffix (engine is available with the following options):
S – Electric starter;
T – Retractable starter;
ST – Electric and retractable starter;
EP – Electric plant;
A – Special oil pan;
C – Clutch model;
G – Generator applications;
P – Pump model;
Q – Quled model;
R – Reduction gear;
|Type||4-stroke, L-head, single cylinder|
|Displacement||512 cm 3 (31.24 cu-in)|
|Max. horsepower||14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm|
|Max. torque (crank PTO)||–|
|Fuel system||Carburetor (Kohler or Walbro, fixed main jet or adjustable main jet)|
|Ignition system||Magneto or battery or breakerless ignition system|
|Lubricating system||Splash type|
|Starting system||Recoil or electric starter|
|Fuel used||Unleaded gasoline (octane number 86 or higher)|
|Fuel tank capacity||–|
Cylinder Block and Head
|Bore x Stroke||88.9 X 82.6 mm (3.5 x 3.25 in)|
|Sleeve internal diameter||88.9127-88.8873 mm (3.5005-3.4995 in)|
|Piston skirt outer diameter||88.7501-88.7425 mm (3.4941-3.4938 in)|
|Number of piston rings (compression / oil):||2 / 1|
|Ring end gap||Top||0.177-0.432 mm (0.007-0.017 in)|
|Second||0.177-0.432 mm (0.007-0.017 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)|
|Valve Arrangement:||L-head (sidevalve)|
|Valve head diameter:||INTAKE||34.798-35.052 mm (1.370-1.380 in)|
28.448-28.702 mm (1.120-1.130 in)
Suffix “D” and later: 34.798-35.052 mm (1.370-1.380 in)
|Stem outer diameter (standard):||INTAKE||7.887-7.899 mm (0.3105-0.3110 in)|
|EXHAUST||7.833-7.851 mm (0.3084-0.3091 in)|
Tightening torque specs
|Tightening torque specs|
|Cylinder head bolt||34-41 Nm; 3.5-4.2 kg·m; 25-30 ft·lb|
Nut: 68-81 Nm; 6.98.2 kg·m; 50-60 ft·lb
Screw: 30-35 Nm; 3.0-3.5 kg·m; 22-27 ft·lb
|Spark plug||25-30 Nm; 2.55-3.06 kg·m; 18-22 ft·lb|
|Max speed||3,600 rpm|
|Intake valve clearance||0.20-0.25 mm (0.0079-0.0098 in)|
|Exhaust valve clearance||0.43-0.48 mm (0.0169-0.0189 in)|
|Oil type||API SF or SG|
Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
K321: 1.9 L (2.01 US. qt, 1.67 Imp. qt.)
K321A: 1.2 L (1.27 US. qt, 1.06 Imp. qt.)
|Spark plug||Champion: RH10|
|Spark plug gap||0.65 mm (0.0256 in)|
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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