The Honda G100 K2 is a 98 cc (5.98 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
The cylinder bore is 52.0 mm (2.05 in) and the piston stroke is 46.0 mm (1.81 in). The compression ratio rating is 6.5:1.
The Honda G100 K2 engine produced 2.5 PS (1.9 kW; 2.5 HP) at 4,200 rpm of maximum output power and 3.5 N·m (0.4 kg·m, 2.6 ft·lb) of peak torque.
The Honda G100 K2 features:
- Side valve (L-head) design
- Transistorized magneto ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal govervor
- Splash type lubrication system
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | G100 K2 |
| Engine type | 4-stroke, L-head, single-cylinder |
| Displacement | 98 cm3, (5.98 cu·in) |
| Max. horsepower | 2.5 PS (1.9 kW; 2.5 HP) at 4,200 rpm |
| Max. torque | 3.5 N·m (0.4 kg·m, 2.6 ft·lb) |
| Cooling system | Forced air |
| Lubricating system | Splash type |
| Ignition system | Transistorized magneto |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | 320 g/HPh |
| Fuel tank capacity | 1.4 L (0.37 US. gal. 0.31 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal govervor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 6.5:1 |
| Cylinder bore: | 52.0 mm (2.05 in) |
| Piston stroke: | 46.0 mm (1.81 in) |
| Cylinder internal diameter (standard): | 52.000 mm (2.0472 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Crankshaft center distance: | 23 mm (0.905 in) |
| Cylinder head | |
| Valve arrangement: | L-head, belt driven |
| Valves: | 2 |
Tightening torque specs
| Tightening torque specs | |
| Carburetor | 4-6 Nm; 0.4-0.6 kg·m; 2.9-4.3 ft·lb |
| Flywheel | 45-55 Nm; 4.5-5.5 kg·m; 32.5-40 ft·lb |
| Governor arm | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Cylinder head | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Crankcase cover | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Connecting rod | 4-6 Nm; 0.4-0.6 kg·m; 2.9-4.3 ft·lb |
| Others | |
| 5 mm bolts, nuts | 4-7 Nm; 0.4-0.7 kg·m; 2.9-5.1 ft·lb |
| 6 mm bolts, nuts | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| 8 mm bolts, nuts | 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.3 ft·lb |
| 10 mm bolts, nuts | 35-40 Nm; 3.5-4.0 kg·m; 25-29 ft·lb |
Service Data
| Idle speed: | 1,400±150 rpm |
| Cylinder compression: | 6.5 kg/cm2 (637 kPa) at 800 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.08-0.16 mm (0.0031-0.0063 in) |
| Exhaust valve clearance: | 0.08-0.16 mm (0.0031-0.0063 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | Honda 4-stroke “SJ” |
| Recommended oil: | SAE 10W-40 |
| Oil capacity: | 0.45 L (0.48 US. qt, 0.4 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal type carburetor with butterfly valve |
| Ignition system | |
| Type: | Transistorized magneto |
| Spark plug: | NGK: BPMR-4A |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
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