Honda GV100

Honda GV100The Honda GV100 is a 97 cc, (5.92 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Honda Motor Company for general-purpose applications.

This engine produced 2.6 PS (1.9 kW; 2.5 HP) at 4,200 rpm of horsepower and 4.3 N·m (0.4 kg·m, 3.2 ft·lb) at 3,000 rpm of torque. A 52.0 mm (2.05 in) cylinder bore and 46.0 mm (1.81 in) piston stroke give the GV100 engine a total of 97 cc (5.92 cu·in) of displacement. The compression ratio rating is 5.6:1.

The Honda GV100 features:

  • Transistorized magneto ignition system
  • Horizontal carburetor with butterfly valve
  • Splash type lubrication system
  • Forced air cooling system
  • Recoil starter

General information

Engine Specifications
Engine modelGV100 K1
Engine type4-stroke, single-cylinder
Displacement97 cm3, (5.92 cu·in)
Max. horsepower2.6 PS (1.9 kW; 2.5 HP) at 4,200 rpm
Max. torque4.3 N·m (0.4 kg·m, 3.2 ft·lb) at 3,000 rpm
Cooling systemForced air
Lubricating systemSplash type
Ignition systemTransistorized magneto ignition
Fuel systemHorizontal carburetor with butterfly valve
Fuel tank capacity0.9 L (0.24 US. gal. 0.2 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal govervor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)390 x 257 x 227 mm (15.4 x 10.1 x 8.9 in)
Dry weight8.9 kg (19.6 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:5.6:1
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)
Piston skirt outer diameter (standard):51.995 mm (2.047 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):10.006 mm (0.3939 in)
Side clearance (Top):0.100-0.135 mm (0.0039-0.0053 in)
Side clearance (Second):0.100-0.135 mm (0.0039-0.0053 in)
Side clearance (Oil):0.100-0.135 mm (0.0039-0.0053 in)
Ring end gap (Top):0.15-0.30 mm (0.0059-0.0118 in)
Ring end gap (Second):0.15-0.30 mm (0.0059-0.0118 in)
Ring end gap (Oil):0.20-0.70 mm (0.0079-0.0276 in)
Crankpin journal diameter:17.984 mm (0.708 in)
Crankshaft center distance:23 mm (0.905 in)
Cylinder head
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):27.10 mm (1.0669 in)
Valve spring free length (EXHAUST):27.10 mm (1.0669 in)
Camshaft lobe height (INTAKE):21.82 mm (0.8591 in)
Camshaft lobe height (EXHAUST):21.82 mm (0.8591 in)

Tightening torque specs

Tightening torque specs
Cylinder head (6 mm bolts, nuts)8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Oil pan8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Connecting rod cap (5 mm bolt)4-6 Nm; 0.4-0.6 kg·m; 2.9-4.3 ft·lb
Carburetor (5 mm nuts)4-6 Nm; 0.4-0.6 kg·m; 2.9-4.3 ft·lb
Governor arm (6 mm nut)8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Flywheel (12 mm nut)45-55 Nm; 4.5-5.5 kg·m; 32-40 ft·lb
Side plate8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Tappet cover8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Air cleaner case7-10 Nm; 0.7-1.0 kg·m; 5.1-7.2 ft·lb
Muffler13-17 Nm; 1.3-1.7 kg·m; 9.4-12 ft·lb
5 mm bolts, nuts4-7 Nm; 0.4-0.7 kg·m; 2.9-5.1 ft·lb
6 mm bolts, nuts8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
8 mm bolts, nuts20-28 Nm; 2.0-2.8 kg·m; 14.5-20.3 ft·lb
10 mm bolts, nuts35-40 Nm; 3.5-4.0 kg·m; 25-29 ft·lb

Service Data

The Honda 4-stroke or an equivalent (SG.SF/CC.CD) oil with a viscosity of SAE 10W-30 is recommended for the GV100 K1, refilling oil capacity is 0.4 L (0.42 US. qt, 0.35 Imp. qt.). Recommended spark plug is NGK: BMR-4A NIPPONDENSO: W14MR-U with 0.6-0.7 mm (0.0236-0.0276 in) spark plug gap.

Maximum speed:3,000 rpm
Idle speed:2000 ± 150 rpm
Cylinder compression:2.0-4.0 kg/cm2 at 600 rpm 8.2 kg/cm2 at 1200 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:SAE 10W-30
Recommended oil:Honda 4-stroke or an equivalent (SG.SF/CC.CD)
Oil capacity:0.4 L (0.42 US. qt, 0.35 Imp. qt.)
Fuel system
Type:Horizontal carburetor with butterfly valve
Main jet:#58
Float height:12.0±1.5 m mm (0.4724 in)
Pilot screw opening:2 3/8 turns out
Ignition system
Type:Transistorized magneto ignition
Ignition timing:20° B.T.D.C (Fixed)
Spark plug gap:0.6-0.7 mm (0.0236-0.0276 in)
Ignition coil air gap0.2-0.6 mm (0.0079-0.0079 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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