The Honda GX160 UT2/T2 is a 163 cc (9.95 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.
It has a 68.0 mm (2.68 in) cylinder bore and 45.0 mm (1.77 in) piston stroke. The compression ratio rating is 9.0:1.
The GX160 UT2/T2 engine produced 5.0 PS (3.6 kW; 4.9 HP) at 3,600 rpm of maximum horsepower and 10.3 N·m (1.05 kg·m, 7.6 ft·lb) at 2,500 rpm of maximum torque.
The Honda GX160 T1/K1 features:
- Overhead valve (OHV) design
- High compression ratio for better fuel efficiency
- C.D.I. (Capacitor Discharge Ignition) ignition
- Horizontal carburetor with butterfly valve
- Mechanical centrifugal govervor
- Forced splash type lubrication system
- Forced air cooling system
- Heavy-duty recoil or recoil and electirc starter
General information
| Engine Specifications | |
| Engine model | GX160 UT2/T2 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 163 cm3, (9.95 cu·in) |
| Max. horsepower | 5.0 PS (3.6 kW; 4.9 HP) at 3,600 rpm |
| Max. torque | 10.3 N·m (1.05 kg·m, 7.6 ft·lb) at 2,500 rpm |
| Cooling system | Forced air |
| Air cleaner |
Dual type, Dual silent type, Semi dry type, Oil bath type, Cyclone type |
| Lubricating system | Splash type |
| Ignition system | C.D.I. (Capacitor Discharge Ignition) |
| Fuel system | Horizontal carburetor with butterfly valve |
| Fuel consumption | 1.4 Liters (0.37 US gal)/h |
| Fuel tank capacity | 3.1 L (0.82 US gal, 0.68 Imp gal) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil or electirc starter |
| Stoping system | Ignition exciter coil circuit open |
| Governor | Mechanical centrifugal govervor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 9.0:1 |
| Cylinder bore: | 68.0 mm (2.68 in) |
| Piston stroke: | 45.0 mm (1.77 in) |
| Cylinder internal diameter (standard): | 68.000 mm (2.6772 in) |
| Piston skirt outer diameter (standard): | 67.985 mm (2.6766 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 30.020 mm (1.1819 in) |
| Connecting rod small end diameter (standard): | 18.005 mm (0.7089 in) |
| Side clearance (Top): | 0.060-0.095 mm (0.0024-0.0037 in) |
| Side clearance (Second): | 0.045-0.080 mm (0.0018-0.0032 in) |
| Ring end gap (Top): | 0.200-0.350 mm (0.0079-0.0138 in) |
| Ring end gap (Second): | 0.350-0.500 mm (0.0138-0.0197 in) |
| Ring end gap (Oil): | 0.100-0.350 mm (0.004-0.014 in) |
| Ring width (Top): | 0.925-0.945 mm (0.0364-0.0372 in) |
| Ring width (Second): | 0.940-0.960 mm (0.0370-0.0378 in) |
| Crankpin journal diameter: | 29.980 mm (1.1803 in) |
| Crankshaft center distance: | 22.5 mm (0.885 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 5.468-5.480 mm (0.2153-0.2157 in) |
| Valve steam diameter (EXHAUST): | 5.425-5.440 mm (0.2136-0.2142 in) |
| Valve spring free length (INTAKE): | 30.500 mm (1.2008 in) |
| Camshaft lobe height (INTAKE): | 27.503-27.903 mm (1.0828-1.0985 in) |
| Camshaft lobe height (EXHAUST): | 27.503-27.903 mm (1.0828-1.0985 in) |
| Camshaft journal diameter : | 13.984 mm (0.5506 in) |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod bolt | 10 Nm; 1.0 kg·m; 7 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 | 24 Nm; 2.4 kg·m; 17 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: | 5.0-7.0 kg/cm2 (71-100 psi) at 600 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.08±0.02 mm (0.003±0.001 in) |
| Exhaust valve clearance: | 0.10±0.02 mm (0.004±0.001 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | SAE 10W-30 |
| Recommended oil: | Honda 4-stroke or an equivalent (SJ or higher) |
| Oil capacity: | 0.58 L (0.61 US. qt, 0.51 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal carburetor with butterfly valve |
| Main jet: |
BE54C, BE54P: #70 BE54D, BE66U, BE54J: #68 |
| Float height: | 13.7 mm (0.5394 in) |
| Pilot screw opening: |
BE54C: 2-1/4 turns out BE54P: 2-1/2 turns out BE54D, BE66U, BE54J: 1-7/8 turns out |
| Ignition system | |
| Type: | C.D.I. (Capacitor Discharge Ignition) |
| Ignition timing: | 18° B.T.D.C. (Fixed) |
| Spark plug: |
NGK: BPR6ES DENSO: W20EPR-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 (0.0079-0.0240 in) |
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