The Kohler HD775 is a 173 cc (10.6 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the HD series, manufactured by Kohler Co.
The Kohler HD775 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, vertical PTO-shaft, splash type lubrication system. This engine is equipped with a fixed main jet carburetor and dependable electronic magneto ignition system.
A 70.0 mm (2.75 in) cylinder bore and 45.0 mm (1.80 in) piston stroke give the HD775 engine a total of 173 cc of displacement. The compression ratio rating is 8.5:1.
This engine produces 10.5 Nm (1.07 kg·m; 7.75 lb-ft) at 2,800 rpm of peak torque.
The breakdown of the engine code is as follows:
- HD – HD-series
- 775 – 7.75 lb-ft of peak torque
General information
| Engine Specifications | |
| Model | HD775 |
| Type | 4-stroke, OHV, single-cylinder |
| Displacement | 173 cm 3 (10.6 cu-in) |
| Max. horsepower | – |
| Max. torque | 10.5 Nm (1.07 kg·m; 7.75 lb-ft) at 2,800 rpm |
| Fuel system | Carburetor with a fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Dependable electronic magneto |
| Lubricating system | Splash type |
| Starting system | Recoil starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.4 liters (1.48 US.qts, 1.23 Imp. qts) |
| Dimensions (L x W X H) | 434 x 353 x 279 mm (17.1 x 13.9 x 11.0 in) |
| Dry weight | 12.2 kg (26.9 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.5:1 | |
| Bore x Stroke | 70.0 mm X 45.0 mm (2.75 x 1.80 in) | |
| Sleeve internal diameter | 70.000-70.020 mm (2.7550-2.7560 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Thrust face outer diameter | 69.960-69.980 mm (2.7543-2.7551 in) | |
| Piston pin outer diameter | 17.990-17.996 mm (0.7082-0.7085 in) | |
| Ring-to-groove side clearance: | Top | 0.010-0.020 mm (0.0004-0.0008 in) |
| Second | 0.010-0.020 mm (0.0004-0.0008 in) | |
| Ring end gap: | Top | 0.100-0.250 mm (0.0039-0.0098 in) |
| Second | 0.300-0.500 mm (0.0118-0.0197 in) | |
| Bearing journal outer diameter: |
Flywheel: 24.975-24.989 mm (0.9832-0.9838 in) PTO: 26.950-26.970 mm (1.0610-1.0620 in) |
|
| Crankpin journal diameter: | 29.985-29.995 mm (1.1805-1.1809 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 per cylinder) | |
| Valve head diameter: | INTAKE | 25.875-26.125 mm (1.0187-1.0285 in) |
| EXHAUST | 23.875-24.125 mm (0.9399-0.9498 in) | |
| Stem outer diameter: | INTAKE | 5.465-5.480 mm (0.2152-0.2157 in) |
| EXHAUST | 5.465-5.480 mm (0.2152-0.2157 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head (torque in 2 increments) |
Step 1: 14.0 Nm (1.4 kgf·m; 10.3 ft·lb) Step 2: 27.8 Nm (2.8 kgf·m; 20.5 ft·lb) |
| Connecting rod | 12.5 Nm (1.3 kgf·m; 9.2 ft·lb) |
| Flywheel | 51.5 Nm (5.3 kgf·m; 38 ft·lb) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 ft·lb) |
Service Information
| Valve clearance | |
| Intake | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Exhaust | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Oil system | |
| Oil type | API SJ or higher |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.6 liters (0.63 US.qts, 0.53 Imp. qts) |
| Ignition system | |
| Spark plug | Kohler 1413214-S |
| Spark plug gap | 0.76 mm (0.0300 in) |
| Ignition module air gap | 0.254 mm (0.010 in) |
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