The Honda G100 is a 76 cc, (4.64 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company since 1980 for general-purpose applications.
The Honda G100 engine has a single-cylinder, side-valve (L-head) design with two valves, a camshaft driven by a single-row chain, and a heavy-duty recoil starter. This engine used a horizontally type carburetor with butterfly valve, flywheel magneto ignition, splash type lubricating system, and forced-air cooling system. The G100 is equipped with a 1.4 L (0.37 US. gal. 0.31 Imp. gal.) fuel tank.
The G100 engine produced 2.0 PS (1.5 kW; 2.0 HP) or 2.2 PS (1.6 kW; 2.1 HP) at 4,200 rpm of maximum horsepower and 3.3 N·m (0.3 kg·m, 2.4 ft·lb) or 3.5 N·m (0.4 kg·m, 2.6 ft·lb) of peak torque.
General information
| Engine Specifications | |
| Engine model | G100 |
| Engine type | 4-stroke, L-head, single-cylinder |
| Displacement | 76 cm3, (4.64 cu·in) |
| Max. horsepower | 2.0 PS (1.5 kW; 2.0 HP) or 2.2 PS (1.6 kW; 2.1 HP) at 4,200 rpm |
| Max. torque | 3.3 N·m (0.3 kg·m, 2.4 ft·lb) or 3.5 N·m (0.4 kg·m, 2.6 ft·lb) |
| Cooling system | Forced air |
| Lubricating system | Splash type |
| Ignition system | Flywheel magneto |
| Fuel system | Horizontal 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) |
Cylinder Block and Head
It has a 46.0 mm (1.81 in) cylinder bore and a 46.0 mm (1.81 in) piston stroke. The compression ratio rating is 6.5:1.
| Cylinder block | |
| Compression ratio: | 6.5:1 |
| Cylinder bore: | 46.0 mm (1.81 in) |
| Piston stroke: | 46.0 mm (1.81 in) |
| Cylinder internal diameter (standard): | 46.000 mm (1.811 in) |
| Piston skirt outer diameter (standard): | 45.980 mm (1.8102 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 18.000 mm (0.7087 in) |
| Connecting rod small end diameter (standard): | 10.000 mm (0.3937 in) |
| Side clearance (Top): | 0.025-0.055 mm (0.001-0.0022 in) |
| Side clearance (Second): | 0.010-0.040 mm (0.0004-0.0016 in) |
| Side clearance (Oil): | 0.010-0.040 mm (0.0004-0.0016 in) |
| Ring end gap (Top): | 0.15-0.35 mm (0.0059-0.0138 in) |
| Ring end gap (Second): | 0.15-0.35 mm (0.0059-0.0138 in) |
| Ring end gap (Oil): | 0.15-0.35 mm (0.0059-0.0138 in) |
| Crankpin journal diameter: | 17.973 mm (0.7076 in) |
| Crankshaft center distance: | 23.0 mm (0.905 in) |
| Cylinder head | |
| Valve arrangement: | L-head |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 5.490 mm (0.2161 in) |
| Valve steam diameter (EXHAUST): | 5.445 mm (0.2144 in) |
| Valve spring free length (INTAKE): | 27.1 mm (1.0669 in) |
| Valve spring free length (EXHAUST): | 27.1 mm (1.0669 in) |
| Camshaft lobe height (INTAKE): | 18.100-18.400 mm (0.7126-0.7244 in) |
| Camshaft lobe height (EXHAUST): | 18.100-18.400 mm (0.7126-0.7244 in) |
Tightening torque
| Tightening torque settings | |
| 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; |
| 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 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: | 10W-40 |
| Recommended oil: | Honda 4-stroke “SE” |
| Oil capacity: | 0.45 L (0.48 US. qt, 0.4 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal carburetor with butterfly valve |
| Main jet: | #55 |
| Float height: | 6.7-9.7 mm mm (0.2638 in) |
| Pilot screw: | 1-3/8 turns out |
| Ignition system | |
| Type: | Flywheel magneto |
| Ignition timing: | 20° B.T.D.C. (Fixed) |
| Spark plug: | NGK: BM4A, BMR4A NIPPON DENSO: W14M-U, W14MR-U |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
Applications
| Manufacturer or Brand | Models |
| Tillers | |
| Honda | F200 |
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