Kohler HD675

Kohler HD675The Kohler HD675 is a 149 cc (9.1 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the HD series, manufactured by Kohler Co.

The Kohler HD675 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 65.0 (2.60) cylinder bore and 45.0 mm (1.80 in) piston stroke give the HD675 engine a total of 149 cc of displacement. The compression ratio rating is 9.2:1.

This engine produces 9.2 Nm (0.94 kg·m; 6.75 lb-ft) at 2,800 rpm of peak torque.

The breakdown of the engine code is as follows:

  • HD – HD-series
  • 675 – 6.75 lb-ft of peak torque

General information

Engine Specifications
Type4-stroke, OHV, single-cylinder
Displacement149 cm 3 (9.1 cu-in)
Max. horsepower
Max. torque9.2 Nm (0.94 kg·m; 6.75 lb-ft) at 2,800 rpm
Fuel systemCarburetor with a fixed main jet
Cooling systemForced-air
Ignition systemDependable electronic magneto
Lubricating systemSplash type
Starting systemRecoil starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity1.1 liters (1.2 US.qts, 0.97 Imp. qts)
Dimensions (L x W X H)366 x 356 x 267 mm (14.4 x 14.0 x 10.5 in)
Dry weight11.5 kg (25.3 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:9.2:1
Bore x Stroke65.0 mm X 45.0 mm (2.60 x 1.80 in)
Sleeve internal diameter65.000-65.020 mm (2.5590-2.5600 in)
Number of piston rings (compression / oil):2 / 1
Thrust face outer diameter64.975-64.985 mm (0.2558-0.2558 in)
Piston pin outer diameter12.990-12.996 mm (0.5114-0.5116 in)
Ring-to-groove side clearance:Top0.010-0.020 mm (0.0004-0.0008 in)
Second0.010-0.020 mm (0.0004-0.0008 in)
Ring end gap:Top0.100-0.250 mm (0.0039-0.0098 in)
Second0.610-0.760 mm (0.0240-0.0299 in)
Bearing journal outer diameter: Flywheel: 25.005-25.019 mm (0.9844-0.9850 in)
PTO: 26.950-26.970 mm (1.0610-1.0620 in)
Crankpin journal diameter:25.985-25.995 mm (1.0230-1.0234 in)
Cylinder Head
Valve Arrangement:OHV, gear drive
Valves:4 (2 per cylinder)
Valve head diameter:INTAKE25.875-26.125 mm (1.0187-1.0285 in)
EXHAUST23.875-24.125 mm (0.9399-0.9498 in)
Stem outer diameter:INTAKE5.465-5.480 mm (0.2152-0.2157 in)
EXHAUST5.465-5.480 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 rod12.5 Nm (1.3 kgf·m; 9.2 ft·lb)
Flywheel51.5 Nm (5.3 kgf·m; 38 ft·lb)
Spark plug27.0 Nm (2.75 kg·m; 20.0 ft·lb)

Service Information

Valve clearance
Intake0.0762-0.1270 mm (0.0030-0.0050 in)
Exhaust0.0762-0.1270 mm (0.0030-0.0050 in)
Oil system
Oil typeAPI SJ or higher
Recommended oilSAE 10W-30
Oil capacity0.6 liters (0.63 US.qts, 0.53 Imp. qts)
Ignition system
Spark plugKohler 1413214-S
Spark plug gap0.76 mm (0.0300 in)
Ignition module air gap0.254 mm (0.010 in)
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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