Honda GX620 K1

Honda GX620 K1 engineThe Honda GX620 K1 is a 0.6 L (614 cc, 37.5 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications. The GX610 used to concrete saws, pressure washers, chipper and shredders, trenchers, generators, vibratory rollers, ride-on cement trowels, lawn tractors

The Honda GX620 K1 engine has a V-twin, overhead valve (OHV) design and recoil starter or electric starter. This engine used horizontal type carburetor with butterfly valve, transistorized magneto ignition system, forced type lubricating system, and forced-air cooling system. The engine is fitted with the dual element air cleaner.

The Honda GX620 K1 engine produced 20.3 PS (14.9 kW; 20.0 HP) at 3,600 rpm of maximum output power and 44.1 N·m (4.5 kg·m, 32.5 ft·lb) at 2,500 rpm of peak torque.

General information

Engine Specifications
Engine model GX620 K1
Engine type 4-stroke, OHV, two-cylinders
Displacement 614 cm3, (37.5 cu·in)
Max. horsepower 20.3 PS (14.9 kW; 20.0 HP) at 3,600 rpm
Max. torque 44.1 N·m (4.5 kg·m, 32.5 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dual element type
Lubricating system Forced lubrication
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 313 g/kWh
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil or electric starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 388 x 457 x 452 mm (15.3 x 18 x 17.8 in)
Dry weight 42.0 kg (92.6 lbs)

Cylinder Block and Head

It has a 77.0 mm (3.03 in) cylinder bore and 66.0 mm (2.6 in) piston stroke. Compression ratio rating is 8.3:1. Each piston is fitted with two compression and single oil ring.

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): 77.000 mm (3.0315 in)
Piston skirt outer 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): 0.20-0.40 mm (0.0079-0.0157 in)
Ring end gap (Second): 0.20-0.40 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)
Crankshaft center distance: 33 mm (1.3 in)
Cylinder head
Valve arrangement: OHV, gear driven
Valves:: 2 per cilinder (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

Tightening torque settings
Connecting rod bolt: 12 Nm; 1.2 kg·m; 9 ft·lb
Cylinder head bolt: 34 Nm; 3.5 kg·m; 25 ft·lb
Socket bolt: 27 Nm; 2.7 kg·m; 20 ft·lb
Flywheel nut: 196 Nm; 20.0 kg·m; 145 ft·lb
Pivot bolt: 24 Nm; 2.4 kg·m; 17 ft·lb
Pivot adjusting nut: 10 Nm; 1.0 kg·m; 7 ft·lb
Cylinder head cover bolt: 9 Nm; 0.9 kg·m; 6.5 ft·lb
Oil drain bolt: 39 Nm; 4.0 kg·m; 29 ft·lb

Service Data

The Honda 4-stroke or an equivalent (SG or SF) oil with a viscosity of SAE 10W-30 or 10W-40 is recommended for the GX620 K1, refilling oil capacity is 1.50 L (1.59 US. qt, 1.32 Imp. qt.). Recommended spark plug are NGK: ZGR5A DENSO: J16CR-U with 0.7-0.8 mm (0.0276-0.0315 in) spark plug gap.

The valve clearance is 0.13-0.17 mm (0.0051-0.0067 in) for intake valves and 0.18-0.20 mm (0.0071-0.0079 in) for exhaust valves. Standard cylinder compression is 6.0-8.0 kg/cm2 (85-121 psi) at 600 rpm.

Engine
Maximum speed: 3,850±150 rpm
Idle speed: 1,400 ±150 rpm rpm
Cylinder compression: 6.0-8.0 kg/cm2 (85-121 psi) at 600 rpm
Valve clearance
Intake valve clearance: 0.13-0.17 mm (0.0051-0.0067 in)
Exhaust valve clearance: 0.18-0.20 mm (0.0071-0.0079 in)
Oil system
Lubrication system: Forced lubrication
Oil type: Honda 4-stroke or an equivalent (SG or SF)
Recommended oil: SAE 10W-30 or 10W-40
Oil capacity: Without oil filter: 1.50 L (1.59 US. qt, 1.32 Imp. qt.)
With oil filter: 1.80 L (1.90US. qt, 1.58 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #105
Float height: 14.0 mm (0.5512 in)
Pilot screw opening: 1-3/4 turns out
Ignition system
Type: Transistorized magneto ignition
Ignition timing: B.T.D.C. 20° (Fixed)
Spark plug: NGK: ZGR5A DENSO: J16CR-U
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque: 18 N·m (1.8 kg·m, 13.3 ft·lb)
Ignition coil air gap 0.2-0.6 mm (0.0079-0.0079 in)

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