Honda G100 K2

Honda G100 K2The Honda G100 K2 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.

The cylinder bore is 52.0 mm (2.05 in) and the piston stroke is 46.0 mm (1.81 in). The compression ratio rating is 6.5:1.

The Honda G100 K2 engine produced 2.5 PS (1.9 kW; 2.5 HP) at 4,200 rpm of maximum output power and 3.5 N·m (0.4 kg·m, 2.6 ft·lb) of peak torque.

The Honda G100 K2 features:

  • Side valve (L-head) design
  • Transistorized magneto ignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal govervor
  • Splash type lubrication system
  • Forced air cooling system
  • Recoil starter

General information

Engine Specifications
Engine model G100 K2
Engine type 4-stroke, L-head, single-cylinder
Displacement 98 cm3, (5.98 cu·in)
Max. horsepower 2.5 PS (1.9 kW; 2.5 HP) at 4,200 rpm
Max. torque 3.5 N·m (0.4 kg·m, 2.6 ft·lb)
Cooling system Forced air
Lubricating system Splash type
Ignition system Transistorized magneto
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 320 g/HPh
Fuel tank capacity 1.4 L (0.37 US. gal. 0.31 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H)
Dry weight

Cylinder Block and Head

Cylinder block
Compression ratio: 6.5:1
Cylinder bore: 52.0 mm (2.05 in)
Piston stroke: 46.0 mm (1.81 in)
Cylinder internal diameter (standard): 52.000 mm (2.0472 in)
Number of piston rings (compression / oil): 2/1
Crankshaft center distance: 23 mm (0.905 in)
Cylinder head
Valve arrangement: L-head, belt driven
Valves: 2

Tightening torque specs

Tightening torque specs
Carburetor 4-6 Nm; 0.4-0.6 kg·m; 2.9-4.3 ft·lb
Flywheel 45-55 Nm; 4.5-5.5 kg·m; 32.5-40 ft·lb
Governor arm 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Cylinder head 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Crankcase cover 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Connecting rod 4-6 Nm; 0.4-0.6 kg·m; 2.9-4.3 ft·lb
Others
5 mm bolts, nuts 4-7 Nm; 0.4-0.7 kg·m; 2.9-5.1 ft·lb
6 mm bolts, nuts 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
8 mm bolts, nuts 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.3 ft·lb
10 mm bolts, nuts 35-40 Nm; 3.5-4.0 kg·m; 25-29 ft·lb

Service Data

Idle speed: 1,400±150 rpm
Cylinder compression: 6.5 kg/cm2 (637 kPa) at 800 rpm
Valve clearance
Intake valve clearance: 0.08-0.16 mm (0.0031-0.0063 in)
Exhaust valve clearance: 0.08-0.16 mm (0.0031-0.0063 in)
Oil system
Lubrication system: Splash type
Oil type: Honda 4-stroke “SJ”
Recommended oil: SAE 10W-40
Oil capacity: 0.45 L (0.48 US. qt, 0.4 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Ignition system
Type: Transistorized magneto
Spark plug: NGK: BPMR-4A
Spark plug gap: 0.6-0.7 mm (0.0236-0.0276 in)

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