The Honda GX340 K1 is a 0.34 l (337 cc, 20.6 cu·in) single-cylinder air-coolled 4-stroke internal combustion small gasoline engine with horizontal shaft, manufactured by Honda Motor Co. since 1985 for general-purpose applications.
From spring 2010 onwards, Honda producing the updated version of GX340 engines. These engines meet the most stringent exhaust gas emission regulation, EPA Phase III.
The Honda GX340 K1 has overhead valve design, single-cylinder inclined by 25°, transistorized magneto ignition system and horizontal carburetor with a butterfly valve. It was equipped with recoil or electric starter.
The Honda GX340K1 produces 11.0 HP (8.2 kW) at 3,600 rpm and 24 Nm (2.4 kg·m, 17.0 ft·lb) of torque at 2,500 rpm. It has a bore and stroke of 82.0 mm x 64.0 mm. Compression ratio rating is 8.0:1.
General information
| Engine Specifications | |
| Model | GX340K1 |
| Type | 4-stroke, OHV, single cylinder, inclined by 25° |
| Displacement | 337 cm 3 (20.6 cu·in) |
| Max. horsepower | 11.0 HP (8.2 kW) at 3,600 rpm |
| Max. torque (crank PTO) | 24 Nm (2.4 kg·m, 17.0 ft·lb) at 2,500 rpm |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition |
| Lubricating system | Forced splash |
| Starting system | Recoil and Starter motor |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | 6.5 Liters (1.72 US gal, 1.43 Imp gal) / h |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Honda GX340K1 (Type S) | |
| Length, mm (in) | 380 (15.0) |
| Width, mm (in) | 450 (17.7) |
| Height, mm (in) | 443 (17.4) |
| Dry weight, kg (lb) | 31.0 (68.3) |
| Operating weight, kg (lb) |
37.0 (81.6) |
Cylinder Block and Head
The Honda GX340 has cast iron cylinder sleeve, ball bearing supported crankshaft, improved piston design, heavy duty balancer shaft. The piston has two compression rings and one oil ring. Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency.
| Cylinder block | ||
| Compression ratio: | 8.0:1 | |
| Bore x Stroke | 82 X 64 mm (3.2 x 2.5 in) | |
| Sleeve internal diameter | 82.000 mm (3.228 in) | |
| Piston skirt outer diameter | 81.985 mm (3.2277 mm) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top/second | 0.030 – 0.060 (0.0012 – 0.0024) |
| Ring end gap | Top | 0.20 – 0.40 mm (0.01 – 0.02 in) | Second | 0.20 – 0.40 mm (0.01 – 0.02 in) |
| Oil (side rail) | 0.20 – 0.70 mm (0.01 – 0.03 in) | |
| Ring width | Top | 2.0 mm (0.08 in) |
| Second | 2.0 mm (0.08 in) | |
| Connecting rod small end I.D. | 20.005 mm (0.7876 in) | |
| Connecting rod big end I.D. | 36.025 mm (1.4183 in) | |
| Crankshaft outer diameter | 35.985 mm (1.4167 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 6.590 mm (0.2594 in) |
| EXHAUST | 6.550 mm (0.2579 in) | |
| Guaide inner diameter: | INTAKE/EXHAUST | 6.60 mm (0.6260 in) |
| Cam height: | INTAKE | 31.85-32.25 mm (1.254-1.270 in) |
| EXHAUST | 31.57-31.97 mm (1.243-1.259 in) | |
| Camshaft outer diameter: | 15.984 mm (0.6293 in) | |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod bolt (M8x1.25 Special) | 14 Nm; 1.4 kg·m; 10 ft·lb |
| Cylinder head bolt (M10x1.25) | 35 Nm; 3.5 kg·m; 25 ft·lb |
| Flywheel nut (M16x1.5 Special) | 115 Nm; 11.5 kg·m; 83 ft·lb |
| Rocker arm pivot lock nut (M6x0.5) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Rocker arm pivot bolt (M8x1.25 Special) | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Crankcase cover bolt (M8x1.25) | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Oil level switch joint nut (M10x1.25) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Fuel filter joint nut (M10x1.25) | 2 Nm; 0.2 kg·m; 1.4 ft·lb |
| Muffler mounting nut (M8x1.25) | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Air cleaner wing nut (M6x1.0) | 9 Nm; 0.9 kg·m; 6.5 ft·lb |
| Oil drain bolt (M12x1.5) | 23 Nm; 2.3 kg·m; 17 ft·lb |
| Fuel tank bolt (M8x1.25) | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Air cleaner mounting nut (M6x1.0) | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Fuel strainer cup (M24x1.0) | 4 Nm; 0.4 kg·m; 2.9 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) | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Bolt, nut (10 mm) | 37.5 Nm; 3.75 kg·m; 27 ft·lb |
| Bolt, nut (12 mm) | 55 Nm; 5.5 kg·m; 40 ft·lb |
Maintenance data
| Engine | |
| Maximum speed | 3850 ± 150 rpm |
| Idle speed | 1400 ± 150 rpm |
| Cylinder compression | 6.0-8.5 kg/cm2 (85-121 psi, 0.59 – 0.83 MPa) at 600 rpm |
| Valve clearance | |
| Intake valve | 0.15 ± 0.02 (0.006 ± 0.001) |
| Exhaust valve | 0.20 ± 0.02 (0.008 ± 0.001) |
| Carburetor | |
| Main jet |
Externally vented carburetor bowl: #88 Internally vented carburetor bowl: #108 |
| Float height | 13.2 mm (0.52 in) |
| Pilot screw opening |
Externally vented carburetor bowl: 2-1/2 Internally vented carburetor bowl: 3 |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or later) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.1 L (1.16 US qt, 0.97 lmp qt) |
| Ignition system | |
| Ignition timing | B.T.D.C. 25° (Fixed) |
| Spark plug | NGK: BP6ES, BPR6ES DENSO: W20EP-U, W20EPR-U |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Starter motor | |
| Brush length | 7.0 mm (0.28 in) limit: 3.5 mm (0.14 in) |
| Mica depth | 1.0 mm (0.04 in) limit: 0.2 (0.01) |
Engine applications
- Pressure washers
- Commercial lawn and garden equipment
- Tillers / cultivators
- Generators
- Construction / industrial equipment
- Agricultural equipment
- Small vehicles
- Water pumps
Author:
Bonjour ,
Je possède un Moteur / HONDA GX 340 Max .
Ce moteur fonctionne avec Nettoyeur HP Kranzle 250 Bars . Références Frappées sur bloc moteur :
– LX / GC05-1381 50 1
Autres référence sur moteur :
– GX340Max – 8.1 Kw – 11.0 Hp – 337 Cc
Je ne retrouve pas les : – – Fiches techniques ” Moteur ” .
– Catalogue ” Pièces détachées ”
Chez Honda il y a environ 300 Types de la série GX 340 !!
Pouvez vous , selon vos possibilités , me transmettre ces ” Documents ” ,
ou me renseigner comment les obtenir .
Dans l’attente de votre réponse , veuillez agréer mes sincères salutations .
Michel RIVOISY
Adresse E.mail : [email protected]
GSM : +33 7 51 42 34 73
Please i want the ignitions coil for my 340 max gen set
Looks like you have 1.16 us gallons for oil capacity… should read 1.16 us QUARTS. I don’t imagine the other measurements are wrong and I doubt this engine holds as much oil as my car…
Very good information thanks😇