Honda GX160 T1

Honda GX160 T1The Honda GX160 T1 is a 163 cc (9.9 cu-in) single-cylinder inclined by 25° air-cooled 4-stroke internal combustion small gasoline engine with horizontal shaft manufactured by Honda Motor Company for general-purpose applications, such as commercial lawn and garden equipment, tillers and cultivators, generators, construction and industrial equipment, agricultural equipment and water pumps.

The Honda GX160 T1 engine has an OHV (overhead valve) design; high compression ratio for better fuel efficiency; horizontal type carburetor with butterfly valve; heavy duty recoil or electric starter and transistorized magneto ignition system.

The cylinder bore is 68.0 mm (2.7 in) and the piston stroke is 45.0 mm (1.8 in), compression ratio rating is 7.5:1 or 8.5:1. The engine produced 4.0 kW (5.5 HP) of horsepower at 4,000 rpm.

Maximum torque:

  • Crank P.T.O.: 11 N·m (1.1 kg·m, 8 ft·lb) at 2,500 rpm
  • With 1/2 reduction: 22 N·m (2.2 kg·m, 16 ft·lb) at 1,250 rpm
  • With 1/6 reduction: 66 N·m (6.6 kg·m, 48 ft·lb) at 420 rpm

General information

Engine Specifications
ModelGX160 T1
Type4-stroke, OHV, single cylinder inclined by 25°
Displacement163 cm 3 (9.9 cu-in)
Max. horsepower5.5 HP (4.4 kW) at 4,000 rpm
Max. torque (crank PTO)11 N·m (1.1 kg·m, 8 ft·lb) at 2,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity3.6 L (0.95 US Gal, 0.79 Imp Gal.)
Fuel consumption230 g/PSh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

The Honda GX160 has cast iron cylinder sleeve, ball bearing supported forged steel crankshaft, improved piston design. The piston has two compression rings and one oil ring. Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency.

Cylinder block
Compression ratio:7.5:1 or 8.5:1
Bore x Stroke68 X 45 mm (2.7 x 1.8 in)
Sleeve internal diameter68.00 mm (2.68 in)
Piston skirt outer diameter67.985 mm (2.6766 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.015-0.045 mm (0.0006-0.0018 in)
Second/Oil0.015-0.045 mm (0.0006-0.0018 in)
Ring end gapTop/Second0.20-0.40 mm (0.008-0.016 in)
Oil0.15-0.35 mm (0.006-0.014 in)
Ring widthTop/Second1.5 mm (0.06 in)
Oil2.5 mm (0.10 in)
Connecting rod small end ID18.005 mm (0.7087 in)
Connecting rod big end ID30.02 mm (1.182 in)
Piston pin outer diameter13.0 mm (0.51 in)
Crankshaft crank pin outer diameter29.98 mm (1.180 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valves:2
Stem outer diameter (standard):INTAKE5.48 mm (0.216 in)
EXHAUST5.44 mm (0.214 in)
Valve spring free length:30.5 mm (1.20 in)
Camshaft outer diameter:13.984 mm (0.5506 in)
Cam height:INTAKE27.7 mm (1.09 in)
EXHAUST27.75 mm (1.093 in)

Tightening torque specs

Tightening torque specs
Connecting rod bolt12 Nm; 1.2 kg·m; 9 ft·lb
Cylinder head bolt24 Nm; 2.4 kg·m; 17 ft·lb
Flywheel nut75 Nm; 7.5 kg·m; 54 ft·lb
Rocker arm pivot lock nut10 Nm; 1.0 kg·m; 7 ft·lb
Rocker arm pivot bolt24 Nm; 2.4 kg·m; 17 ft·lb
Crankcase cover bolt12 Nm; 1.2 kg·m; 9 ft·lb
Oil level switch joint nut10 Nm; 1.0 kg·m; 7 ft·lb
Oil drain bolt18 Nm; 1.8 kg·m; 13 ft·lb
Standard torque values
Bolt, nut (5 mm)5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Bolt, nut (6 mm)10 Nm; 1.0 kg·m; 7 ft·lb
Bolt, nut (8 mm)24 Nm; 2.4 kg·m; 17 ft·lb
Bolt, nut (10 mm)37.5 Nm; 3.75 kg·m; 27 ft·lb
Bolt, nut (12 mm)55 Nm; 5.5 kg·m; 40 ft·lb

Service Information

Engine
Maximum speed3,900 ± 100 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression6.0-8.5 kg/cm2 (85-121 psi) at 600 rpm
Valve clearance
Intake valve clearance0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil typeHonda 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Carburetor
Main jet Externally vented carburetor bowl: #72
Internally vented carburetor bowl: #68
Float height13.7 mm (0.54 in)
Pilot screw opening Externally vented carburetor bowl: 2 turns out
Internally vented carburetor bowl: 2-1/8 turns out
Ignition system
Ignition timing25° B.T.D.C. (Fixed)
Spark plugNGK: BP6ES, BPR6ES
NIPPONDENSO: W20EP-U, W20EPR-U
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance0.8-1.0 Ω
Secondary ignition coil resistance5.9-7.1 kΩ
Ignition coil air gap0.4 ± 0.2 (0.016 ± 0.008)
Starter motor
Brush length11.0 mm (0.43 in)
Mica depth1.6 mm (0.06 in)
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