The Kohler XTR-6 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 XTR-6 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 engine a total of 149 cc of displacement. The compression ratio rating is 9.2:1.
This engine produces 3.8 PS (2.8 KW; 3.8 HP) at 3,600 rpm of horsepower and 8.5 Nm (0.87 kg·m; 6.3 ft·lb) at 2,800 rpm of peak torque.
The breakdown of the engine code is as follows:
- XT – XT-series
- R – Electric starter
- 6 – 6.00 lb-ft of peak torque
General information
| Engine Specifications | |
| Model | XTR-6 |
| Type | 4-stroke, OHV, single-cylinder |
| Displacement | 149 cm 3 (9.1 cu-in) |
| Max. horsepower | 3.8 PS (2.8 KW; 3.8 HP) at 3,600 rpm |
| Max. torque | 8.5 Nm (0.87 kg·m; 6.3 ft·lb) 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 | Electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.1 liters (1.2 US.qts, 0.97 Imp. qts) |
| Dimensions (L x W X H) | 406 x 336 x 274 mm (16.0 x 13.2 x 10.8 in) |
| Dry weight | 15.2 kg (33.5 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 9.2:1 | |
| Bore x Stroke | 65.0 mm X 45.0 mm (2.60 x 1.80 in) | |
| Sleeve internal diameter | 65.000-65.020 mm (2.5590-2.5600 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Thrust face outer diameter | 64.975-64.985 mm (0.2558-0.2558 in) | |
| Piston pin outer diameter | 12.990-12.996 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) PTO: 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: | 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 141-32-11-S |
| Spark plug gap | 0.76 mm (0.0300 in) |
| Ignition module air gap | 0.254 mm (0.010 in) |
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