Honda G45

Honda G45The Honda G45 is a 240 cc (14.65 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company from 1964 for general-purpose applications.

A 72.0 mm (2.83 in) cylinder bore and 59.0 mm (2.32 in) piston stroke give the G45 engine a total of 240 cc of displacement.

The Honda G45 engine produced 6.0 PS (4.4 kW; 5.9 HP) at 4,000 rpm of maximum output power.

The Honda G45 features:

  • L-haed design
  • High voltage ignition system
  • Horizontal type carburetor with butterfly valve
  • Splash type lubrication system
  • Recoil starter

General information

Engine Specifications
Engine model G45
Engine type 4-stroke, L-head, single-cylinder
Displacement 240 cm3, (14.65 cu·in)
Max. horsepower 6.0 PS (4.4 kW; 5.9 HP) at 4,000 rpm
Max. torque
Cooling system Forced air
Lubricating system Splash
Ignition system High voltage ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel tank capacity 6.0 L (1.59 US. gal. 1.32 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 374 x 323 x 450 mm (14.7 x 12.7 x 17.7 in)
Dry weight 23.0 kg (50.7 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:
Cylinder bore: 72.0 mm (2.83 in)
Piston stroke: 59.0 mm (2.32 in)

Service Data

Cylinder compression: 5.3 kg/cm2 (75 psi)
Valve clearance
Tappet clearance : 0.05-0.10 mm (0.002-0.0039 in)
Oil system
Lubrication system: Splash
Oil type: Honda 4-stroke or an equivalent
Recommended oil: SAE 10W-30
Oil capacity: 0.75 L (0.79 US. qt, 0.66 Imp. qt.)
Ignition system
Type: High voltage ignition
Spark plug: NGK: B-4H
Spark plug gap: 0.6-0.7 mm (0.0236-0.0276 in)

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