The Kohler ECH650 is a 694 cc, (42.4 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine from the Command PRO EFI series, manufactured by Kohler Co.
The Kohler ECH650 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, pressurized lubrication system. This engine is equipped with an EFI (electronic fuel injection) system and electronic ignition system.
The cylinder bore and the piston stroke are 80.0 mm (3.15 in) and 69.0 mm (2.72 in), respectively. Compression ratio rating is 8.7:1.
The Kohler ECH650 engine produced 21.4 PS (15.7 KW; 21.0 HP) at 3,600 rpm of horsepower and 46.8 Nm (4.77 kg·m; 34.54 ft·lb) at 2,600 rpm of torque.
The breakdown of the engine code is as follows:
- E – EFI
- C – Command series
- H – Horizontal PTO shaft
- 650 – Numerical designation
General information
| Engine Specifications | |
| Model | Command PRO EFI ECH650 |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 694 cm 3 (42.4 cu-in) |
| Max. horsepower | 21.4 PS (15.7 KW; 21.0 HP) at 3,600 rpm |
| Max. torque | 46.8 Nm (4.77 kg·m; 34.54 ft·lb) at 2,600 rpm |
| Fuel system | EFI (electronic fuel injection) system |
| Cooling system | Forced-air |
| Ignition system | Electronic ignition system |
| Lubricating system | Pressurized lubrication |
| Starting system | Electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Dimensions (L x W X H) | 376 x 480 x 622 mm (14.8 x 18.9 x 24.5 in) |
| Dry weight | 49.0 kg (108.0 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.7:1 | |
| Bore x Stroke | 80.0 mm X 69.0 mm (3.15 x 2.72 in) | |
| Sleeve internal diameter | 80.000-80.025 mm (3.1496-3.1506 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Piston style A | ||
| Thrust face outer diameter | 79.943-79.961 mm (3.1473-3.1480 in) | |
| Piston pin outer diameter | 16.995-17.000 mm (0.6691-0.6693 in) | |
| Ring-to-groove side clearance: | Top | 0.050-0.095 mm (0.0019-0.0037 in) |
| Second | 0.030-0.075 mm (0.0012-0.00307 in) | |
| Oil | 0.010-0.110 mm (0.0004-0.0043 in) | |
| Ring end gap: | Top | 0.250-0.560 mm (0.0100-0.0224 in) |
| Second | 0.250-0.560 mm (0.0100-0.0224 in) | |
| Piston style B | ||
| Thrust face outer diameter | 79.966 mm (3.1483 in) | |
| Piston pin outer diameter | 16.995-17.000 mm (0.6691-0.6693 in) | |
| Ring-to-groove side clearance: | Top | 0.030-0.070 mm (0.0010-0.0026 in) |
| Second | 0.030-0.070 mm (0.0010-0.0026 in) | |
| Oil | 0.060-0.190 mm (0.0022-0.0073 in) | |
| Ring end gap: | Top | 0.100-0.279 mm (0.0039-0.0110 in) |
| Second | 1.400-1.679 mm (0.0551-0.0661 in) | |
| Crankshaft | ||
| Crankshaft main journal diameter: | 40.913-40.935 mm (1.6107-1.6116 in) | |
| Crankpin journal diameter: | 35.950-35.973 mm (1.4153-1.4163 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 per cylinder) | |
| Valve head diameter: | INTAKE | 33.370-33.630 mm (1.3138-1.324 in) |
| EXHAUST | 29.370-29.630 mm (1.1563-1.1665 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) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head |
Nut (torque in 2 increments): Step 1: 16.9 Nm (1.72 kg·m; 12.5 ft·lb) Step 2: 35.5 Nm (3.62 kg·m; 26.2 ft·lb) Bolt (torque in 2 increments) Step 1: 22.6 Nm (2.31 kg·m; 16.7 ft·lb) Step 2: 41.8 Nm (4.26 kg·m; 30.8 ft·lb) |
| Flywheel | 71.6 Nm (7.3 kgf·m; 52.8 ft·lb) |
| 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: 1.7 L (1.8 US. qt, 1.5 Imp. qt.) With oil filter: 1.9 L (2.0 US.qts, 1.7 Imp. qts) |
| Ignition system | |
| Spark plug | Champion RC12YC or XC12YC |
| Spark plug gap | 0.76 mm (0.030 in) |
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