Honda GXV670

Honda GXV670The Honda GXV670 is a 670 cc, (40.9 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, for general-purpose applications.

A 77.0 mm (3.03 in) cylinder bore and 72.0 mm (2.83 in) piston stroke give the GXV670 engine a total of 670 cc of displacement. The compression ratio rating is 8.3:1.

The Honda GXV670 engine produced 24.1 PS (17.7 kW; 23.7 HP) at 3,600 rpm of maximum output power and 50.8 N·m (5.2 kg·m, 37.4 ft·lb) at 2,500 rpm of peak torque.

The Honda GXV670 features:

  • Overhaed valve (OHV) design
  • Transistorized magneto ignition
  • Horizontal type carburetor with butterfly valve
  • Centrifugal governor
  • Forced lubrication lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine modelGXV670
Engine type4-stroke, OHV, V-Twin
Displacement670 cm3, (40.9 cu·in)
Max. horsepower24.1 PS (17.7 kW; 23.7 HP) at 3,600 rpm
Max. torque50.8 N·m (5.2 kg·m, 37.4 ft·lb) at 2,500 rpm
Cooling systemForced air
Air cleanerDual element type
Lubricating systemForced lubrication
Ignition systemTransistorized magneto ignition
Fuel systemHorizontal type carburetor with butterfly valve
Fuel consumption265 g/HPh
Fuel tank capacity
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemElectric starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)464 x 573 x 449 mm (18.3 x 18.6 x 17.7 in)
Dry weight45.3 kg (99.9 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.3:1
Cylinder bore:77.0 mm (3.03 in)
Piston stroke:72.0 mm (2.83 in)
Number of piston rings (compression / oil):2/1
Crankshaft center distance:36 mm (1.415 in)
Cylinder head
Valve arrangement:OHV, belt driven
Valves:2,(4 valves in total)

Service Data

Maximum speed:3400±100 rpm
Idle speed:1400±150 rpm
Cylinder compression:6.0-8.0 kg/cm2 (85-114 psi) at 500 rpm
Valve clearance
Intake valve clearance:0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance:0.20±0.02 mm (0.008±0.001 in)
Oil system
Lubrication system:Forced lubrication
Oil type:Honda 4-stroke or an equivalent (SG or SF)
Recommended oil:SAE 10W-30
Oil capacity: Without oil filter: 2.2 L (2.32 US. qt, 1.94 Imp. qt.)
With oil filter: 2.5 L (2.6 US. qt, 2.2 Imp. qt.)
Fuel system
Type:Horizontal type carburetor with butterfly valve
Ignition system
Type:Transistorized magneto ignition
Spark plug:NGK: ZGR5A DENSO: J16CR-U
Spark plug gap:0.7-0.8 mm (0.0276-0.0315 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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