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

General information

Engine Specifications
Engine modelG45
Engine type4-stroke, L-head, single-cylinder
Displacement240 cm3, (14.65 cu·in)
Max. horsepower6.0 PS (4.4 kW; 5.9 HP) at 4,000 rpm
Max. torque
Cooling systemForced air
Lubricating systemSplash
Ignition systemHigh voltage ignition
Fuel systemHorizontal type carburetor with butterfly valve
Fuel tank capacity6.0 L (1.59 US. gal. 1.32 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
PTO shaft rotationCounterclockwise (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 weight23.0 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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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