Honda GXV620 K1

Honda GXV620 K1The Honda GXV620 K1 is a 614 cc (37.5 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Honda Motor Company for general-purpose applications.

Cylinder bore and piston stroke are 77.0 mm (3.03 in) and 66.0 mm (2.6 in), respectively. The compression ratio rating is 8.3:1.

The Honda GXV620 K1 engine produced 20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm of maximum output power and 44.1 Nm (4.5 kg·m; 32.55 ft·lb) at 2,500 rpm of peak torque.

The Honda GXV620 K1 features:

  • Overhead valve (OHV) design
  • Transistorized magneto ignition system
  • Horizontal carburetor with butterfly valve
  • Centrifugal govervor
  • Forced lubrication system
  • Forced air cooling system
  • Recoil and electric starter, or electric starter only

General information

Engine Specifications
Engine modelGXV620 K1
Engine type4-stroke, OHV, V-twin
Displacement614 cm3, (37.5 cu·in)
Max. horsepower20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm
Max. torque44.1 Nm (4.5 kg·m; 32.55 ft·lb) at 2,500 rpm
Cooling systemForced air
Air cleanerDual element type
Lubricating systemForced lubrication
Ignition systemTransistorized magneto ignition
Fuel systemHorizontal carburetor with butterfly valve
Fuel consumption230 g/HPh
Fuel tank capacity
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil and electric starter, or electric starter only
Stoping systemIgnition primary circuit ground
GovernorCentrifugal govervor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)459 x 457 x 431 mm (18.1 x 18 x 17 in)
Dry weight43.0 kg (94.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.3:1
Cylinder bore:77.0 mm (3.03 in)
Piston stroke:66.0 mm (2.6 in)
Cylinder internal diameter (standard):76.985 mm (3.0309 in)
Number of piston rings (compression / oil):2/1
Connecting rod small end diameter (standard):18.005 mm (0.7089 in)
Piston pin diameter:18.000 mm (0.7087 in)
Side clearance (Top):0.030-0.060 mm (0.0012-0.0024 in)
Side clearance (Second):0.030-0.060 mm (0.0012-0.0024 in)
Ring end gap (Top):0.200-0.400 mm (0.0079-0.0157 in)
Ring end gap (Second):0.200-0.400 mm (0.0079-0.0157 in)
Ring width (Top):1.990 mm (0.0783 in)
Ring width (Second):1.990 mm (0.0783 in)
Crankshaft main journal diameter:38.000 mm (1.4961 in)
Crankpin journal diameter:39.995 mm (1.5746 in)
Cylinder head
Valve arrangement:OHV
Valves:2 (4 valves in total)
Valve steam diameter (INTAKE):6.590 mm (0.2594 in)
Valve steam diameter (EXHAUST):6.550 mm (0.2579 in)
Valve spring free length (INTAKE):39.0 mm (1.5354 in)
Valve spring free length (EXHAUST):39.0 mm (1.5354 in)
Camshaft lobe height (INTAKE):29.865 mm (1.1758 in)
Camshaft lobe height (EXHAUST):29.865 mm (1.1758 in)
Camshaft journal diameter :16.985 mm (0.6687 in)

Tightening torque specs

Tightening torque specs
Connecting rod bolt12 Nm; 1.2 kg·m; 9 ft·lb
Cylinder head bolt34 Nm; 3.5 kg·m; 25 ft·lb
Socket bolt27 Nm; 2.7 kg·m; 20 ft·lb
Flywheel nut196 Nm; 20.0 kg·m; 145 ft·lb
Pivot bolt24 Nm; 2.4 kg·m; 17 ft·lb
Pivot adjusting nut10 Nm; 1.0 kg·m; 7 ft·lb
Cylinder head cover bolt9 Nm; 0.9 kg·m; 6.5 ft·lb
Oil level switch joint nut10 Nm; 1.0 kg·m; 7 ft·lb
Oil drain bolt39 Nm; 4.0 kg·m; 29 ft·lb
Standard torque values
Bolt, nut (5 mm)5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Bolt, nut (6 mm)10 Nm; 1.0 kg·m; 7 ft·lb
Bolt, nut (8 mm)22 Nm; 2.2 kg·m; 16 ft·lb
Bolt, nut (10 mm)34 Nm; 3.5 kg·m; 25 ft·lb
Bolt, nut (12 mm)54 Nm; 5.5 kg·m; 40 ft·lb

Service Data

Maximum speed:3,250-3,550 rpm rpm
Idle speed:1,250-1,550 rpm rpm
Cylinder compression:6.0-8.0 kg/cm2 (85-114 psi) at 500 rpm
Valve clearance
Intake valve clearance0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance0.20±0.02 mm (0.008±0.001 in)
Oil system
Lubrication system:Forced lubrication
Oil type:SAE 10W-30
Recommended oil:Honda 4-stroke or an equivalent (SJ or later)
Oil capacity: Without oil filter: 1.7 L (1.8 US. qt, 1.5 Imp. qt.)
With oil filter: 2.2 L (2.3 US. qt, 1.9 Imp. qt.)
Fuel system
Type:Horizontal carburetor with butterfly valve
Main jet:#115
Float height:14.0 mm (0.5512 in)
Pilot screw opening:1-3/4 turns out
Ignition system
Type:Transistorized magneto ignition
Ignition timing:20° B.T.D.C.
Spark plug: NGK: ZGR5A
Spark plug gap:0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.4±0.2 mm (0.016±0.008)


Manufacturer or BrandModels
Lawn tractors
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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