The Kohler TH650 is a 653 cc (39.8 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine from the Triad series, manufactured by Kohler Co.
The Kohler TH650 engine has an OHC (overhead camshaft) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, fuul-pressurized lubrication system, replaceable high-density paper air cleaner. This engine is equipped with a carburetor with a fixed main jet, electronic ignition system (CDI).
A 80.0 mm (3.15 in) cylinder bore and 65.0 mm (2.56 in) piston stroke give the TH650 engine a total of 653 cc of displacement. The compression ratio rating is 8.8:1.
This engine produced 20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm of horsepower and 45.1 Nm (4.6 kg·m; 33.3 ft·lb) at 2,500 rpm of torque.
The breakdown of the engine code is as follows:
- T – Triad series
- H – Horizontal PTO shaft
- 650 – Displacement 650 cc
General information
| Engine Specifications | |
| Model | Triad TH650 |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 653 cm 3 (39.8 cu-in) |
| Max. horsepower | 20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm |
| Max. torque | 45.1 Nm (4.6 kg·m; 33.3 ft·lb) at 2,500 rpm |
| Fuel system | Carburetor with a fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Electronic ignition (CDI) |
| Lubricating system | Full-pressure lubrication |
| Starting system | Recoil or electic starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Dimensions (L x W X H) | 328 x 400 x 449 mm (12.9 x 15.7 x 17.7 in) |
| Dry weight | 43.0 kg (90.0 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.4:1 | |
| Bore x Stroke | 80.0 mm X 65.0 mm (2.15 x 2.56 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHC, belt driven | |
| Valves: | 2 (4 in total) | |
| Valve head diameter: | INTAKE | 29.180-29.430 mm (1.1488-1.1586 in) |
| EXHAUST | 26.300-26.700 mm (1.0354-1.0512 in) | |
| Stem outer diameter: | INTAKE | 5.982-6.000 mm (0.2355-0.2362 in) |
| EXHAUST | 5.970-5.988 mm (0.2350-0.2357 in) | |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod | 11.3 Nm (1.2 kgf·m; 8.3 ft·lb) |
| Oil drain plug | 16.3 Nm (1.7 kgf·m; 12.0 ft·lb) |
| Oil filter | 5.6-9.0 Nm (0.6-0.9 kgf·m; 4.1-6.6 ft·lb) |
| Muffler retaining nuts | 24.4 Nm (2.5 kgf·m; 18 ft·lb) |
| Valve cover | 5.6 Nm (0.6 kgf·m; 4.1 ft·lb) |
| Flywheel | 66.4 Nm (6.77 kg·m; 49 ft·lb) |
| Spark plug | 24.4-29.8 Nm (2.5-3 kgf·m; 18-22 ft·lb) |
Service Information
| Valve clearance | |
| Intake | 0.013-0.064 mm (0.0005-0.0025 in) |
| Exhaust | 0.076-0.127 mm (0.0030-0.0050 in) |
| Oil system | |
| Oil type | API SG, SH, SJ, or higher |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.4 liters (1.48 US.qts, 1.23 Imp. qts) |
| Ignition system | |
| Spark plug | Champion RC12YC |
| Spark plug gap | 0.76 mm (0.030 in) |
| Ignition module air gap | 0.200-0.300 mm (0.0079-0.0118 in) |
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