Honda GX340 K1

Honda GX340 K1 engineThe Honda GX340 K1/T1/UT1 is a 337 cc, (20.56 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.

The Honda GX340 K1 engine has a single cylinder inclined by 25°, overhead valve (OHV) design, horizontal type carburetor with butterfly valve, transistorized magneto ignition system, mechanical splash type lubricating system and forced-air cooling system. The GX340 K1 engine could be equipped with dual element type, oil-bath type or a cyclone-type air cleaner. The GX340K1 is equipped with 6.5 L (1.72 US. gal. 1.43 Imp. gal.) fuel tank.

The Honda GX340K1 engine produced 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm of maximum output power and 24.0 N·m (2.4 kg·m, 17.7 ft·lb) at 2,500 rpm of peak torque.

General information

Engine Specifications
Engine model GX340 K1/T1/UT1
Engine type 4-stroke, OHV, single-cylinder
Displacement 337 cm3, (20.56 cu·in)
Max. horsepower 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm
Max. torque 24.0 N·m (2.4 kg·m, 17.7 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dual element type
Oil-bath type
Cyclone type
Lubricating system Splash type
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 313 g/kWh
Fuel tank capacity 6.5 L (1.72 US. gal. 1.43 Imp. gal.)
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) Type S: 380 x 450 x 443 mm (15 x 17.7 x 17.4 in)
Dry weight Type S: 31.0 kg (68.3 lbs)

Cylinder Block and Head

An 82.0 mm (3.23 in) cylinder bore and 64.0 mm (2.52 in) piston stroke give the GX340K1 engine a total of 337 cc of displacement. Compression ratio rating is 8.0:1. The Honda GX340 K1 engine has a cast iron cylinder sleeve, ball bearing supported the crankshaft and heavy duty balancer shaft. The piston has two compression rings and a single oil ring.

Cylinder block
Compression ratio: 8.0:1
Cylinder bore: 82.0 mm (3.23 in)
Piston stroke: 64.0 mm (2.52 in)
Cylinder internal diameter (standard): 82.000 mm (3.2283 in)
Piston skirt outer diameter (standard): 81.985 mm (3.2277 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 36.025 mm (1.4183 in)
Connecting rod small end diameter (standard): 20.005 mm (0.7876 in)
Piston pin diameter: 20.000 mm (0.7874 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 end gap (Oil): 0.20-0.70 mm (0.0079-0.0276 in)
Ring width (Top): 2.0 mm (0.0787 in)
Ring width (Second): 2.0 mm (0.0787 in)
Crankpin journal diameter: 35.985 mm (1.4167 in)
Crankshaft center distance: 32 mm (1.26 in)
Cylinder head
Valve arrangement: OHV, gear driven
Valves::
Valve steam diameter (INTAKE): 6.59 mm (0.2594 in)
Valve steam diameter (EXHAUST): 6.59 mm (0.2594 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): 31.85-32.25 mm (1.2539-1.2697 in)
Camshaft lobe height (EXHAUST): 31.57-31.97 mm (1.2429-1.2587 in)
Camshaft journal diameter : 15.984 mm (0.6293 in)

Tightening torque

Tightening torque settings
Connecting rod bolt: 14 Nm; 1.4 kg·m; 10 ft·lb;
Cylinder head bolt: 35 Nm; 3.5 kg·m; 25 ft·lb;
Flywheel nut: 115 Nm; 11.5 kg·m; 83 ft·lb;
Rocker arm pivot lock nut: 10 Nm; 1.0 kg·m; 7 ft·lb;
Rocker arm pivot bolt: 24 Nm; 2.4 kg·m; 17 ft·lb;
Oil drain bolt: 23 Nm; 2.3 kg·m; 17 ft·lb

Service Data

The Honda 4-stroke or an equivalent (SG.SF/CC.CD) oil with a viscosity of SAE 10W-30 is recommended for the GX340K1, refilling oil capacity is 1.1 L (1.16 US. qt, 0.97 Imp. qt.). Recommended spark plug is NGK: BP6ES, BPR6ES, DENSO: W20EP-U, W20EPR-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 0.18-0.22 mm (0.0071-0.0087 in) for exhaust valves. Standard cylinder compression is 6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm.

Engine
Maximum speed: 3,850±150 rpm
Idle speed: 1,400 ±150 rpm
Cylinder compression: 6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm
Valve clearance
Intake valve clearance: 0.13-0.17 mm (0.0051-0.0067 in)
Exhaust valve clearance: 0.18-0.22 mm (0.0071-0.0087 in)
Oil system
Lubrication system: Splash type
Oil type: Honda 4-stroke or an equivalent (SG.SF/CC.CD)
Recommended oil: SAE 10W-30
Oil capacity: 1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: Externally vented: #98
Internally vented: #108
Float height: 13.2 mm (0.5197 in)
Pilot screw opening: Externally vented: 2-1/2 turns out;
Internally vented: 3 turns out
Ignition system
Type: Transistorized magneto ignition
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 (0.0276-0.0315 in)
Ignition coil air gap 0.2-0.4 mm (0.0079-0.0079 in)

Applications

Manufacturer or Brand Models
Tractors
Honda H1011, H3011

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