The Kohler CH980 is a 999 cc, (61.0 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.
The Kohler CH980 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, horizontal PTO-shaft, pressurized lubrication system. This engine is equipped with a two-barrel, side-draft carburetor with fixed main jets and the CDI/MDI or Digital Spark Advance Ignition (DSAI) ignition systems.
Cylinder bore and piston stroke are 90.0 mm (3.54 in) and 78.5 mm (3.09 in), respectively. Compression ratio rating is 8.8:1.
The CH980 engine produced 35.5 PS (26.1 KW; 35.0 HP) at 3,600 rpm of horsepower and 73.9 Nm (7.5 kg·m; 54.5 ft·lb) at 3,200 rpm of torque.
The breakdown of the engine code is as follows:
- C – Command series
- H – Horizontal PTO shaft
- 980 – Numerical designation
General information
| Engine Specifications | |
| Model | Command PRO CH980 |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 999 cm 3 (61.0 cu-in) |
| Max. horsepower |
35.5 PS (26.1 KW; 35.0 HP) at 3,600 rpm 38.5 PS (28.3 KW; 38.0 HP) at 3,600 rpm |
| Max. torque | 73.9 Nm (7.5 kg·m; 54.5 ft·lb) at 3,200 rpm |
| Fuel system | Two-barrel, side-draft carburetor with fixed main jets |
| Cooling system | Forced-air |
| Ignition system | CDI/MDI or Digital Spark Advance Ignition (DSAI) |
| Lubricating system | Pressurized lubrication |
| Starting system | Electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Dimensions (L x W X H) | 388 x 484 x 699 mm (15.3 x 19.0 x 27.5 in) |
| Dry weight | 59.0 kg (132.0 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.8:1 | |
| Bore x Stroke | 90.0 mm X 78.5 mm (3.54 x 3.09 in) | |
| Sleeve internal diameter | 90.000-90.0025 mm (3.5433-3.5434 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Piston style A | ||
| Thrust face outer diameter | 89.953-89.967 mm (3.5414-3.542 in) | |
| Piston pin outer diameter | 18.995-19.000 mm (0.7478-0.7480 in) | |
| Ring-to-groove side clearance: | Top | 0.040-0.080 mm (0.0016-0.0031 in) |
| Second | 0.040-0.080 mm (0.0016-0.0031 in) | |
| Oil | 0.030-0.190 mm (0.0012-0.0075 in) | |
| Ring end gap: | Top | 0.300-0.550 mm (0.0118-0.0217 in) |
| Second | 0.300-0.550 mm (0.0118-0.0217 in) | |
| Piston style B | ||
| Thrust face outer diameter | 89.972 mm (3.5422 in) | |
| Piston pin outer diameter | 19.995-20.000 mm (0.7872-0.7874 in) | |
| Ring-to-groove side clearance: | Top | 0.030-0.070 mm (0.001-0.0026 in) |
| Second | 0.030-0.070 mm (0.001-0.0026 in) | |
| Oil | 0.060-0.190 mm (0.0022-0.0073 in) | |
| Ring end gap: | Top | 0.125-0.304 mm (0.0049-0.0120 in) |
| Second | 0.900-1.179 mm (0.0345-0.0464 in) | |
| Crankshaft main journal diameter: | 44.978-45.000 mm (1.7708-1.7717 in) | |
| Crankpin journal diameter: | 43.982-44.000 mm (1.7316-1.7323 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 per cylinder) | |
| Valve head diameter: | INTAKE | 38.625-38.685 mm (1.5207-1.523 in) |
| EXHAUST | 31.625-31.825 mm (1.2451-1.253 in) | |
| Stem outer diameter: | INTAKE | 6.982-7.000 mm (0.2749-0.2756 in) |
| EXHAUST | 6.970-6.988 mm (0.2744-0.2751 in) | |
| Camshaft journal diameter: | 19.962-19.975 mm (0.7859-0.7864 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head |
Bolt (torque in 2 increments): Step 1: 23.7 Nm (2.4 kgf·m; 17.5 lb·ft) Step 2: 46.9 Nm (4.8 kgf·m; 34.6 lb·ft) |
| Connecting rod cap | 11.0 Nm (1.1 kgf·m; 8.1 lb·ft) |
| Flywheel | 69.8 Nm (7.1 kgf·m; 51.5 lb·ft) |
| Spark plug | 27 Nm (2.75 kg·m; 20.0 ft·lb) |
Service Information
| Oil system | |
| Oil type | API SJ or higher |
| Recommended oil | SAE 10W-30, KOHLER PRO 10W-50 |
| Oil capacity |
W/o oil filter: 1.9 liters (2.0 US.qts, 1.7 Imp. qts) With oil filter: 2.6 liters (2.75 US.qts, 2.3 Imp. qts) |
| Ignition system | |
| Spark plug | Champion RC12YC |
| Spark plug gap | 0.76 mm (0.030 in) |
| Ignition module air gap | 0.280-0.330 mm (0.011-0.013 in) |
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