Honda G100 K1

Honda G100 K1The Honda G100 K1 is a 83 cc (5.1 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 48.0 mm (1.89 in) cylinder bore and 46.0 mm (1.81 in) piston stroke give the G100 K1 engine a total of 83 cc of displacement. The compression ratio rating is 6.5:1.

The G100 K1 engine produced 2.2 PS (1.64 kW; 2.2 HP) at 4,200 rpm of maximum horsepower and 3.8 N·m (0.4 kg·m, 2.8 ft·lb) of maximum torque.

The Honda G100 K1 features:

  • Side valve (L-head) design
  • Transistorized magneto or contact point breaker (CDI) 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 K1
Engine type 4-stroke, L-head, single-cylinder
Displacement 83 cm3, (5.1 cu·in)
Max. horsepower 2.2 PS (1.64 kW; 2.2 HP) at 4,200 rpm
Max. torque 3.8 N·m (0.4 kg·m, 2.8 ft·lb)
Cooling system Forced air
Lubricating system Splash
Ignition system Transistorized magneto or contact point breaker (CDI)
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: 48.0 mm (1.89 in)
Piston stroke: 46.0 mm (1.81 in)
Cylinder internal diameter (standard): 48.000 mm (1.8898 in)
Piston skirt outer diameter (standard): 47.995 mm (1.8896 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 18.000 mm (0.7087 in)
Connecting rod small end diameter (standard): 10.000 mm (0.3937 in)
Side clearance (Top): 0.010-0.050 mm (0.0004-0.002 in)
Side clearance (Second): 0.010-0.050 mm (0.0004-0.002 in)
Side clearance (Oil): 0.010-0.050 mm (0.0004-0.002 in)
Ring end gap (Top): 0.250 mm (0.0098 in)
Ring end gap (Second): 0.250 mm (0.0098 in)
Ring end gap (Oil): 0.450 mm (0.0177 in)
Number of main bearings: 0
Crankpin journal diameter: 17.980 mm (0.7079 in)
Crankshaft center distance: 23.0 mm (0.905 in)
Cylinder head
Valve arrangement: L-head
Valves: 2
Valve steam diameter (INTAKE): 5.490 mm (0.2161 in)
Valve steam diameter (EXHAUST): 5.445 mm (0.2144 in)
Valve spring free length (INTAKE): 27.1 mm (1.0669 in)
Valve spring free length (EXHAUST): 27.1 mm (1.0669 in)
Camshaft lobe height (INTAKE): 20.820 mm (0.8197 in)
Camshaft lobe height (EXHAUST): 20.820 mm (0.8197 in)
Camshaft journal diameter : 12.185 mm (0.4797 in)

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: 1,450±150 rpm
Cylinder compression: 6.5 kg/cm2 (637 kPa) at 800 rpm
Oil system
Lubrication system: Splash
Oil type: Honda 4-stroke “SE”
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
Main jet: #62
Ignition system
Type: Transistorized magneto or contact point breaker (CDI)
Ignition timing: 20° B.T.D.C. (Fixed)
Spark plug: NGK: BM4A, BMR4A NIPPON DENSO: W14M-U, W14
Spark plug gap: 0.6-0.7 mm (0.023-0.027 in)

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