The Kohler XTR-6 is a 149 cc (9.1 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the Courage XT-series with a vertical shaft, manufactured by Kohler Co for general-purpose applications, such as log splitter, pressure washer, tiller, walk-behind mower, yard vacuum.
The cylinder bore and the piston stroke are 65.0 (2.60) and 45.0 mm (1.80 in), respectively. Compression ratio rating is 9.2:1.
The Kohler XTR-6 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 maximum torque.
The Kohler XTR6 features:
- OHV design
- Aluminum cylinder block
- Cast iron cylinder liners
- Dependable electronic magneto ignition system
- Carburetor with fixed main jet
- Mechanical centrifugal governor
- Spalsh type lubrication
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | XTR-6 |
| Engine 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 |
| Cooling system | Forced air |
| Air cleaner | Replaceable, paper element with pre-cleaner |
| Lubricating system | Splash type |
| Ignition system | Dependable electronic magneto |
| Fuel system | Carburetor with fixed main jet |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.1 liters (1.2 US.qts, 0.97 Imp. qts) |
| Starting system | Electric starter |
| Governor | Mechanical centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| 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 |
| Cylinder bore: | 65.0 mm (2.60 in) |
| Piston stroke: | 45.0 mm (1.80 in) |
| Cylinder internal diameter (standard): | 65.000-65.020 mm (2.5590-2.5600 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 12.990-12.996 mm (0.5114-0.5116 in) |
| Thrust face outer diameter (standard): | 64.975-64.985 mm (0.2558-0.2558 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) |
| Ring-to-groove side clearance (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) |
| Ring end gap (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) |
| Number of main bearings: | 2 |
| Crankshaft main journal 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 driven |
| Valves: | 2 (4 valves in total) |
| Valve head diameter (INTAKE): | 25.875-26.125 mm (1.0187-1.0285 in) |
| Valve head diameter (EXHAUST): | 23.875-24.125 mm (0.9399-0.9498 in) |
| Valve seat angle (INTAKE): | 44.5° |
| Valve seat angle (EXHAUST): | 44.5° |
| Valve seat angle (INTAKE): | 45° |
| Valve seat angle (EXHAUST): | 45° |
| Valve steam diameter (INTAKE): | 5.465-5.480 mm (0.2152-0.2157 in) |
| Valve steam diameter (EXHAUST): | 5.465-5.480 mm (0.2152-0.2157 in) |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod | 12.5 Nm (1.3 kgf·m; 9.2 ft·lb) |
| 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) |
| Rocker arm stud | 13.6 Nm (1.4 kgf·m; 10.0 ft·lb) |
| Rocker arm pivot jam nut | 9.5 Nm (1.0 kgf·m; 7.0 ft·lb) |
| Flywheel | 51.5 Nm (5.3 kgf·m; 38 ft·lb) |
| Muffler | Exhaust stud: 5.0 Nm (0.5 kgf·m; 3.7 ft·lb) Exhaust nut: 9.5 Nm (1.0 kgf·m; 7.0 ft·lb) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 ft·lb) |
| Oil drain plug | 13.6 Nm (1.4 kgf·m; 10.0 ft·lb) |
Service Data
| Valve clearance | |
| Intake/Exhaust: | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | API SJ or higher |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.6 liters (0.63 US.qts, 0.53 Imp. qts) |
| Fuel system | |
| Type: | Carburetor with fixed main jet |
| Fuel filter: | In-line fuel filter |
| Ignition system | |
| Type: | Dependable electronic magneto |
| Spark plug: | Kohler 141-32-11-S |
| Spark plug gap: | 0.76 mm (0.030 in) |
| Ignition coil air gap | 0.254 mm (0.010 in) |
References
1. Kohler XT Series XT-6, XTR-6, XT6.5, XT650, XT6.75, XT675, XT-7, XTR-7, XT775, XT8 service manual. Kohler Co. 2014.
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