The Honda G150 is a 144 cc (8.8 cu.in.) single-cylinder, air-cooled, four-stroke, internal combustion small gasoline engine manufactured by Honda Motor Company since 1977 for general-purpose applications.
The Honda G150 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. The engine has an electric or recoil starter, horizontal carburetor with butterfly valve and transistorized magneto or contact point breaker (CDI) ignition system.
The compression ratio rating is 6.5:1, cylinder bore and piston stroke are 64.0 mm (2.52 in) and 45.0 mm (1.77 in), respectively.
The Honda G150 engine produced 3.5 PS (2.6 KW; 3.5 HP) at 3,600 rpm of maximum horsepower for CDI ignition models or 3.8 PS (2.8 KW; 3.8 HP) at 3,600 rpm for models with transistorized magneto ignition.
General information
| Engine Specifications | |
| Model | G150 |
| Type | 4-stroke, side valve type (L-head), single cylinder |
| Displacement | 144 cm 3 (8.8 cu-in) |
| Max. horsepower |
3.5 PS (2.6 KW; 3.5 HP) at 3,600 rpm (CDI) 3.8 PS (2.8 KW; 3.8 HP) at 3,600 rpm (Magneto ignition) |
| Max. torque |
Crankshaft PTO type: 7.1 Nm (0.72 kg·m; 5.24 lbf·ft) at 3,000 rpm (CDI) 7.4 Nm (0.75 kg·m; 5.46 lbf·ft) at 3,000 rpm (Magneto ignition) Camshaft PTO type: 14.2 Nm (1.45 kg·m; 10.5 lbf·ft) at 1,500 rpm (CDI) 14.8 Nm (1.51 kg·m; 10.9 lbf·ft) at 1,500 rpm (Magneto ignition) |
| Carburetor | Horizontal, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto or CDI |
| Lubricating system | Splash type |
| Starting system | Recoil starter |
| Stoping system | Ground of primary circuit |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 2.5 liters (2.64 US.qts, 2.2 Imp. qts) |
| Fuel consumption | 310 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 6.5:1 | |
| Bore x Stroke | 64 X 45 mm (2.52 x 1.77 in) | |
| Sleeve internal diameter | 64.00 mm (2.52 in) | |
| Piston skirt outer diameter | 64.00 mm (2.52 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Piston ring side clearance (Top): | 0.010-0.050 mm (0.0004-0.002 in) | |
| Piston ring side clearance (Second): | 0.010-0.050 mm (0.0004-0.002 in) | |
| Piston ring side clearance (Oil): | 0.010-0.050 mm (0.0004-0.002 in) | |
| Piston ring end gap (Top): | 0.200-0.400 mm (0.008-0.016 in) | |
| Piston ring end gap (Second): | 0.200-0.400 mm (0.008-0.016 in) | |
| Piston ring end gap (Oil): | 0.200-0.400 mm (0.008-0.016 in) | |
| Ring width (Top): | 2.000 mm (0.08 in) | |
| Ring width (Second): | 2.000 mm (0.08 in) | |
| Ring width (Oil): | 3.000 mm (0.12 in) | |
| Connecting rod small end ID | 15.000 mm (0.059 in) | |
| Connecting rod big end ID | 26.000 mm (1.023 in) | |
| Crankpin outer diameter | 26.000 mm (1.02 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | Side valve type (L-head) | |
| Valves: | 2 | |
| Valve stem outer diameter (INTAKE): | 7.000 mm (0.28 in) | |
| Valve stem outer diameter (EXHAUST): | 7.000 mm (0.28 in) | |
| Valve guide inner diameter (INTAKE): | 7.000 mm (0.28 in) | |
| Valve guide inner diameter (EXHAUST): | 7.000 mm (0.28 in) | |
| Spring free length | 36.7 mm (1.44 in) | |
| Camshaft cam height (INTAKE): | 33.500 mm (1.32 in) | |
| Camshaft cam height (EXHAUST): | 33.800 mm (1.33 in) | |
| Camshaft journal diameter: | 17.8 mm (0.70 in) | |
Maintenance data
| Engine | |
| Maximum speed | 3,850 ± 150 rpm |
| Idle speed | 1,400 ± 150 rpm |
| Cylinder compression | 6.0 kg/cm2 (85 psi) |
| Adjust timing ignition | |
| Ignition timing |
24° B.T.D.C. – for magneto ignition 20° B.T.D.C. (Fixed) – Contact breaker point The CDI type does not require adjustment. |
| Adjust valve clearance | |
| Intake valve | 0.08-0.16 mm (0.0031-0.0063 in) |
| Exhaust valve | 0.16-0.24 mm (0.0063-0.0094 in) |
| Oil system | |
| Oil type | Honda 4-stroke “SE” |
| Recommended oil | 10W-40 |
| Oil capacity | 0.7 liters (0.74 US.qts, 0.62 Imp. qts) |
| Carburetor | |
| Main jet | #70 |
| Float height | 8.2 mm (0.32 in) |
| Pilot screw opening | 1-5/8 turns out |
| Ignition system | |
| Spark plug | NGK: B4H, BR4HS |
| Spark plug gap | 0.6-0.7 mm (0.024-0.028 in) |
| Spark plug cap resistance | 10 kΩ |
| Ignition coil (Contact breaker piont type) | |
| Resistance in secondary coil | 6.6 kΩ |
| Ignition coil (Transistorized magneto type) | |
| Primary ignition coil resistance | 0.9 Ω |
| Secondary ignition coil resistance | 6.5 kΩ |
| Ignition coil air gap | 0.3 ± 0.1 (0.012 ± 0.004) |
Tightening torque specs
| Tightening torque specs | |
| Air cleaner case nut (M6x10) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Air cleaner case bolt (M6x70) | 2.5 Nm; 0.25 kg·m; 1.8 ft·lb |
| Connecting rod bolt (M7x35) | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Cylinder head bolt (M8x45) | 25 Nm; 2.5 kg·m; 18 ft·lb |
| Cylinder barrel stud (M8) | 4 Nm; 0.4 kg·m; 2.9 ft·lb |
| Crankcase cover bolt (M6x32) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Control lever bolt (M6x12) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Fan cover (M6x12) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Flywheel nut (M14x1.5) | 75 Nm; 7.5 kg·m; 54 ft·lb |
| Fuel cock bolt (M6x12) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Fuel tank bolt, nut (M6x10) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Ignition coil bolt (M6x32) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Muffler mounting nut (M8x12.5) | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Muffler protector mounting nut (M6x8) | 5 Nm; 0.5 kg·m; 3.6 ft·lb |
| Oil drain bolt (M12) | 20 Nm; 2.0 kg·m; 14.5 ft·lb |
| Side plate (M6x12) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Shroud (M6x12) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Tappet room cover bolt (M6x12) | 14 Nm; 1.4 kg·m; 10 ft·lb |
| Others | |
| 5 mm bolts, nuts | 5.5 Nm; 0.55 kg·m; 4.0 ft·lb |
| 6 mm bolts, nuts | 10 Nm; 1.0 kg·m; 7 ft·lb |
| 8 mm bolts, nuts | 24 Nm; 2.4 kg·m; 17 ft·lb |
| 10 mm bolts, nuts | 37 Nm; 3.7 kg·m; 27 ft·lb |
| 12 mm bolts, nuts | 55 Nm; 5.5 kg·m; 39.5 ft·lb |
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