Honda GX100

Honda GX100The Honda GX100 is a 98 cc (5.98 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.

A 56.0 mm (2.2 in) cylinder bore and 40.0 mm (1.57 in) piston stroke give the GX100 engine a total of 98 cc of displacement. The compression ratio rating is 8.5:1.

The Honda GX100 engine produced 3.0 PS (2.2 kW; 3.0 HP) at 3,600 rpm of maximum output power and 5.7 N·m (0.6 kg·m, 4.2 ft·lb) at 3,600 rpm of peak torque.

The Honda GX100 features:

  • OHC design
  • Transistorized magneto ignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal governor
  • Splash lubrication system
  • Forced air cooling system /li>
  • Recoil starter

General information

Engine Specifications
Engine model GX100
Engine type 4-stroke, OHV, single-cylinder
Displacement 98 cm3, (5.98 cu·in)
Max. horsepower 3.0 PS (2.2 kW; 3.0 HP) at 3,600 rpm
Max. torque 5.7 N·m (0.6 kg·m, 4.2 ft·lb) at 3,600 rpm
Cooling system Forced air
Air cleaner Dual-element type
Lubricating system Splash
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 240 g/PSh
Fuel tank capacity 1.2 L (0.32 US. gal. 0.26 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H)
Dry weight

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 56.0 mm (2.2 in)
Piston stroke: 40.0 mm (1.57 in)
Cylinder internal diameter (standard): 56.000 mm (2.2047 in)
Piston skirt outer diameter (standard): 55.965-55.985 mm (2.2033-2.2041 in)
Number of piston rings (compression / oil): 2/1
Connecting rod small end diameter (standard): 13.005-13.020 mm (0.512-0.5126 in)
Side clearance (Top): 0.015-0.050 mm (0.0006-0.002 in)
Side clearance (Second): 0.015-0.050 mm (0.0006-0.002 in)
Side clearance (Oil): 0.015-0.050 mm (0.0006-0.002 in)
Ring end gap (Top): 0.150-0.300 mm (0.0059-0.0118 in)
Ring end gap (Second): 0.300-0.450 mm (0.0118-0.0177 in)
Crankpin journal diameter: 23.970-23.980 mm (0.9437-0.9441 in)
Crankshaft center distance: 20 mm (0.785 in)
Cylinder head
Valve arrangement: OHC
Valves: 2
Valve steam diameter (INTAKE): 3.970-3.985 mm (0.1563-0.1569 in)
Valve steam diameter (EXHAUST): 3.935-3.950 mm (0.1549-0.1555 in)
Valve spring free length (INTAKE): 25.800 mm (1.0157 in)
Valve spring free length (EXHAUST): 25.800 mm (1.0157 in)
Camshaft lobe height (INTAKE): 36.483 mm (1.4363 in)
Camshaft lobe height (EXHAUST): 36.483 mm (1.4363 in)

Tightening torque

Tightening torque specs
Connecting rod bolt 5 Nm; 0.5 kg·m; 3.6 ft·lb
Oil dran plug bolt 18 Nm; 1.8 kg·m; 13 ft·lb
Valve adjusting lock nut 7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Flywheel nut 42 Nm; 4.3 kg·m; 31 ft·lb
Governor arm nut 10 Nm; 1.0 kg·m; 7 ft·lb
Stopper plate screw 1 Nm; 0.1 kg·m; 0.7 ft·lb
Spark plug 11.8 Nm; 1.2 kg·m; 8.7 ft·lb

Service Data

Engine
Maximum speed: 4,000 ± 200 rpm
Idle speed: 1,550 ± 150 rpm
Cylinder compression: 5.0 kg/cm2 (71 psi) at 700 rpm
Oil system
Lubrication system: Splash
Oil type: Honda 4-stroke or an equivalent (SE or SF)
Recommended oil: SAE 10W-30
Oil capacity: 0.4 L (0.42 US. qt, 0.35 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #60
Float height: 12 mm mm (0.4724 in)
Pilot screw opening: 2-3/8 turns out
Ignition system
Type: Transistorized magneto ignition
Spark plug: NGK: CR5HSB DENSO: U16FSR-UB
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)

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