Kohler XT6.75

Kohler XT6.75The Kohler XT6.75 is a 149 cc (9.1 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Courage XT-series, manufactured by Kohler Co.

The Kohler XT6.75 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 XT6.75 engine a total of 149 cc of displacement. The compression ratio rating is 9.2:1.

This engine produces 4.4 PS (3.2 KW; 4.3 HP) at 3,600 rpm of horsepower and 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:

  • XT – XT-series
  • 6.75 – 6.75 lb-ft of peak torque

General information

Engine Specifications
Type4-stroke, OHV, single-cylinder
Displacement149 cm 3 (9.1 cu-in)
Max. horsepower4.4 PS (3.2 KW; 4.3 HP) at 3,600 rpm
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 weight10.8 kg (23.8 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:Top Before s/n 40244XXXXX: 0.020-0.060 mm (0.0007-0.0023 in)
After s/n 40243XXXXX: 0.010-0.020 mm (0.0004-0.0008 in)
Second Before s/n 40244XXXXX: 0.020-0.060 mm (0.0007-0.0023 in)
After s/n 40243XXXXX: 0.010-0.020 mm (0.0004-0.0008 in)
Ring end gap:Top Before s/n 40244XXXXX: 0.250-0.400 mm (0.0098-0.0157 in)
After s/n 40243XXXXX: 0.100-0.250 mm (0.0039-0.0098 in)
Second Before s/n 40244XXXXX: 0.250-0.400 mm (0.0098-0.0157 in)
After s/n 40243XXXXX: 0.610-0.760 mm (0.0240-0.0299 in)
Bearing journal outer diameter: Flywheel:
Early: 24.975-24.989 mm (0.9832-0.9838 in)
Later: 25.005-25.019 mm (0.9844-0.9850 in)
Early: 25.370-25.385 mm (0.9988-0.9994 in)
Later: 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 141-32-11-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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1 Comment

  1. First time I am working on my lawnmower since it was gifted to me in 2016. The spark plug has gone bad and I needed to research it a bit and came across this site/page (after approx. 30mins.). This hit the nail on the head! Thanks!

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