Honda GX160 UT2/T2

Honda GX160 UT2/T2The 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:

  • 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: 0.06-0.10 mm (0.002-0.004 in)
Exhaust valve clearance: 0.08-0.12 mm (0.003-0.005 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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