The Honda GX620 K1 is a 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, V-twin |
| 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: | 0.15±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 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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