The Honda GX120 UT2/T2 is a 118 cc (7.2 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
The GX120 UT2/T2 engine produced 3.5 PS (2.6 kW; 3.5 HP) at 3,600 rpm of maximum horsepower and 7.3 N·m (0.7 kg·m, 5.4 ft·lb) at 2,500 rpm of maximum torque.
General information
Engine Specifications | |
Engine model | GX120 UT2/T2 |
Engine type | 4-stroke, OHV, single-cylinder |
Displacement | 118 cm3, (7.2 cu·in) |
Max. horsepower | 3.5 PS (2.6 kW; 3.5 HP) at 3,600 rpm |
Max. torque | 7.3 N·m (0.7 kg·m, 5.4 ft·lb) at 2,500 rpm |
Cooling system | Forced air |
Lubricating system | Forced splash |
Ignition system | C.D.I. (Capacitor Discharge Ignition) type magneto ignition |
Fuel system | Horizontal type carburetor with butterfly valve |
Fuel consumption | 1.0 L (0.26 US gal, 0.22 Imp gal) / h |
Fuel tank capacity | 2.0 L (0.53 US. gal. 0.44 Imp. gal.) |
Fuel used | Unleaded gasoline (octane number 86 or higher) |
Starting system | Recoil starter |
Stoping system | Ignition primary circuit ground |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions (L x W X H) | Type H: 370 x 346 x 329 mm (14.6 x 13.6 x 13 in) |
Dry weight | 15.5 kg (34.2 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 8.5:1 |
Cylinder bore: | 60.0 mm (2.36 in) |
Piston stroke: | 42.0 mm (1.65 in) |
Cylinder internal diameter (standard): | 60.000-60.015 mm (2.3622-2.3628 in) |
Piston skirt outer diameter (standard): | 59.965-59.985 mm (2.3608-2.3616 in) |
Number of piston rings (compression / oil): | 2 / 1 |
Connecting rod big end diameter (standard): | 26.020-26.033 mm (1.0244-1.0249 in) |
Connecting rod small end diameter (standard): | 13.005 -13.020 mm (0.512-0.5126 in) |
Piston pin diameter: | 12.994-13.000 mm (0.5116-0.5118 in) |
First ring side clearance: | 0.035-0.070 mm (0.0014-0.0028 in) |
Second ring side clearance: | 0.045-0.080 mm (0.0018-0.0031 in) |
First ring end gap: | 0.200-0.350 mm (0.0079-0.0138 in) |
Second ring end gap: | 0.350-0.500 mm (0.0138-0.0197 in) |
Oil ring end gap: | 0.200-0.700 mm (0.0079-0.0276 in) |
First ring width: | 0.950-0.970 mm (0.0374-0.0382 in) |
Second ring width: | 0.940-0.960 mm (0.037-0.0378 in) |
Crankpin journal diameter: | 25.970-25.980 mm (1.0224-1.0228 in) |
Crankshaft center distance: | 21 mm (0.825 in) |
Cylinder head | |
Valve arrangement: | OHV, gear driven |
Valves:: | 2 |
Intake valve steam diametr: | 5.468-5.480 mm (0.2153-0.2157 in) |
Exhaust valve steam diametr: | 5.425 -5.440 mm (0.2136-0.2142 in) |
Intake valve spring free length: | 30.5 mm (1.2008 in) |
Exhaust valve spring free length: | 30.5 mm (1.2008 in) |
Intake camshaft lobe height: | 27.500-27.900 mm (1.0827-1.0984 in) |
Exhaust camshaft lobe height: | 27.547-27.947 mm (1.0845-1.1003 in) |
Camshaft journal diameter : | 13.966 -13.984 mm (0.5498-0.5506 in) |
Tightening torque
Tightening torque specs | |
Connecting rod bolt | 12 Nm; 1.2 kg·m; 9 ft·lb |
Cylinder head bolt | 24 Nm; 2.4 kg·m; 17 ft·lb |
Flywheel nut | 75 Nm; 7.5 kg·m; 54 ft·lb |
Rocker arm pivot adjusting nut | 10 Nm; 1.0 kg·m; 7 ft·lb |
Rocker arm pivot bolt | 24 Nm; 2.4 kg·m; 17 ft·lb |
Crankcase cover bolt | 12 Nm; 1.2 kg·m; 9 ft·lb |
Oil level switch joint nut | 10 Nm; 1.0 kg·m; 7 ft·lb |
Service Data
Engine | |
Maximum speed: | 3,800-4,000 rpm |
Idle speed: | 1,250-1,600 rpm |
Cylinder compression: | 0.49-0.69 MPa (5.0-7.0 kgf/cm2 , 71-100 psi) / 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: | Forced splash |
Oil type: | SAE 10W-30 |
Recommended oil: | Honda 4-stroke or an equivalent (SE or SF) |
Oil capacity: | 0.56 L (0.59 US. qt, 0.49 Imp. qt.) |
Fuel system | |
Type: | Horizontal type carburetor with butterfly valve |
Main jet: |
BE60W A: #62 BE99A A: #60 BE61M A: #62 BE99B A: #62 |
Float height: | 13.7 mm (0.54 in) |
Pilot screw opening: |
BE60W A: 2-1/8 turns out BE99A A: 1-5/8 turns out BE61M A: 2-1/8 turns out BE99B A: 2-1/8 turns out |
Ignition system | |
Type: | C.D.I. (Capacitor Discharge Ignition) type magneto ignition |
Ignition timing: | B.T.D.C. 20° / 1,400 rpm |
Spark plug: | NGK: BPR6ES DENSO: W20EPR-U |
Spark plug gap: | 0.7-0.8 mm (0.0276-0.0314 in) |
Spark plug torque: | 18 N·m (1.8 kg·m, 13.3 ft·lb) |
Ignition coil air gap | 0.2-0.6 mm (0.0079-0.0240 in) |
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