The Honda G45 is a 240 cc (16.6 cu.in.) single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1964 for general-purpose applications.
The Honda G45 engine has a recoil starter, horizontal carburetor with butterfly valve and high voltage ignition. Cylinder bore and piston stroke are 72.0 mm (2.83 in) and 59.0 mm (3.32 in), respectively.
The G45 produced 4.5 PS (3.31 kW) at 3400 rpm of continuous rated horsepower and 6.0 PS (4.4 kW) at 4000 rpm of maximum horsepower.
General information
| Engine Specifications | |
| Model | G45 |
| Type | 4-stroke, single cylinder |
| Displacement | 240 cm 3 (16.6 cu-in) |
| Max. horsepower | 6.0 PS (4.4 kW) at 4000 rpm |
| Max. torque | – |
| Carburetor | Horizontal, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | High voltage ignition |
| Lubricating system | Splash system |
| Starting system | Recoil starter |
| Stoping system | Ground switch |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 6.0 L |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| G45 | |
| Length, mm (in) | 374 (14.72) |
| Width, mm (in) | 323 (12.71) |
| Height, mm (in) | 450 (17.71) |
| Dry weight, kg (lb) | 23.0 (50.7) |
Maintenance data
| Engine | |
| Cylinder compression | 5.3 kg/cm2 (75 psi) |
| Valves | |
| Tappet clearance | 0.05-0.10 (0.002-0.004 in) |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.75 L |
| Ignition system | |
| Spark plug | NGK: B7-H |
| Spark plug gap | 0.6-0.7 mm (0.024-0.028 in) |
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