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Honda GX340 Specifications
The Honda GX340 K1 is a 0.34 l (337 cc, 20.6 cubic inches) 4-cycle 1-cylinder air-coolled 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, one-cylinder inclined by 25 deg, 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 kgm, 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 Technical Data |
Engine Model .............. Honda GX-340
Engine Type .............. 4-cycle overhead valve single-cylinder air-cooled small gasoline engine
Number of Cylinders .............. 1
Displacement, cu.in (cc) .............. 20.6 (337)
Cylinder Bore, in (mm) .............. 3.24 (82.0)
Piston Stroke, in (mm) .............. 2.53 (64.0)
Rated Engine Power, hp (kW) .............. 11.0 (8.2)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lbs) .............. 24.1 (17.1)
Torque Speed, rpm .............. 2500
Compression Ratio .............. 8.0:1
Valve Arrangement .............. OHV
PTO Shaft Rotation .............. Counterclockwise (from PTO side)
Lubrication System .............. Forced splash type
Air Cleaner .............. Dual type, semi dry type
Cooling System .............. Forced air
Ignition System .............. Transistor type magneto
Stopping System .............. Ignition primary circuit ground
Starting System .............. Recoil or electric starter
| Fuel System |
Fuel System Type .............. Carburetor
Carburetor Type .............. Horizontal, butterfly valve
Governor Type .............. Mechanical centrifugal
Fuel Tank Capacity, qts (L) .............. 6.9 (6.5)
Fuel Type .............. Gasoline (86 or higher)
| Dimensions and Weight |
Overall Length, in (mm) .............. 15.0 (380)
Overall Width, in (mm) .............. 17.7 (450)
Overall Height, in (mm) .............. 17.4 (443)
Dry Weight, lbs (kg) .............. 68.3 (31.0)
| Cylinder Block |
Cylinder Bore Inside Diameter (Std), in (mm) .............. 3.2281-3.2289 (82.000-82.015)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) .............. 3.235 (82.170)
Connecting Rod Small End Inside Diameter (Std), in (mm) .............. 0.7876 (20.005)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) .............. 0.790 (20.07)
Connecting Rod Big End Inside Diameter (Std), in (mm) .............. 1.4183 (36.025)
Connecting Rod Big End Inside Diameter (Wear Limit), in (mm) .............. 1.420 (36.07)
Connecting Rod Big End Oil Clearance, in (mm) .............. 0.0016-0.0026 (0.040-0.066)
Crankshaft Outside Diameter (Std), in (mm) .............. 1.4167 (35.985)
Crankshaft Outside Diameter (Wear Limit), in (mm) .............. 1.415 (35.93)
| Cylinder Head and Valves |
Number of Valves .............. 2
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.005-0.007 (0.13-0.17)
Exhaust Valve Clearance, in (mm) .............. 0.007-0.009 (0.18-0.22)
Intake Valve Stem Outside Diameter (Std), in (mm) .............. 0.2589-0.2594 (6.575-6.590)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.254 (6.44)
Exhaust Valve Stem Outside Diameter (Std), in (mm) .............. 0.2573-0.2579 (6.535-6.550)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.252 (6.40)
Intake Valve Guide Inside Diameter, in (mm) .............. 0.2598-0.2604 (6.600-6.615)
Exhaust Valve Guide Inside Diameter, in (mm) .............. 0.2598-0.2604 (6.600-6.615)
Intake Valve Guide To Stem Clearance, in (mm) .............. 0.0004-0.0016 (0.010-0.040)
Exhaust Valve Guide To Stem Clearance, in (mm) .............. 0.0020-0.0031 (0.050-0.080)
Valve Seat Width (Intake/Exhaust), in (mm) .............. 0.04-0.05 (1.0-1.2)
Valve Spring Free Length, in (mm) .............. 1.54 (39.00)
Cam Height (Intake), in (mm) .............. 1.254-1.270 (31.85-32.25)
Cam Height (Exhaust), in (mm) .............. 1.243-1.259 (31.57-31.97)
Camshaft Outside Diameter (Std), in (mm) .............. 0.6286-0.6293 (15.966-15.984)
Camshaft Outside Diameter (Wear Limit), in (mm) .............. 0.627 (15.92)
| Piston and Piston Rings |
Piston Pin Bore Inside Diameter (Std), in (mm) .............. 0.7875 (20.002)
Piston Pin Bore Inside Diameter (Wear Limit), in (mm) .............. 0.7891 (20.042)
Piston Skirt Outside Diameter, in (mm) .............. 3.2277 (81.985)
Piston to Cylinder Bore Clearance, in (mm) .............. 0.0006-0.0020 (0.015-0.052)
Piston Pin Outside Diameter (Std), in (mm) .............. 0.787 (20.000)
Piston Pin Outside Diameter (Wear Limit), in (mm) .............. 0.785 (19.95)
Top Ring Width, in (mm) .............. 0.08 (2.00)
Second Ring Width, in (mm) .............. 0.08 (2.00)
Top Ring Groove Side Clearance, in (mm) .............. 0.0012-0.0024 (0.030-0.060)
Second Ring Groove Side Clearance, in (mm) .............. 0.0012-0.0024 (0.030-0.060)
Top Ring End Gap, in (mm) .............. 0.010-0.020 (0.20-0.40)
Second Ring End Gap, in (mm) .............. 0.010-0.020 (0.20-0.40)
Oil Ring End Gap, in (mm) .............. 0.010-0.030 (0.20-0.70)
Ring End Gap (Wear Limit), in (mm) .............. 0.04 (1.00)
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