Honda GV100 K1

Honda GV100 engineThe Honda GV100 is a 97 cc (5.9 single-cylinder air-coolled four-stroke internal combustion small gasoline engine with vertical shaft manufactured by Honda Motor Company.

The Honda GV100 engine has a side-valve design with camshaft driven by a timing chain. It has a recoil starter, horizontal butterfly type carburetor, and flywheel magneto ignition system.

The cylinder bore is 52.0 mm (2.04 in) and the piston stroke is 46.0 mm (1.81 in). Compression ratio rating is 6.5:1. The Honda GV100 motor produced 2.6 HP (1.9 kW) at 4200 rpm of horsepower and 4.3 Nm (0.43 kg·m) at 3000 rpm of torque.

General information

Engine Specifications
ModelGV100 K1
Type4-stroke, side valve, single cylinder
Displacement97 cm 3 (5.9 cu-in)
Max. horsepower2.6 HP (1.9 kW) at 4200 rpm
Max. torque4.3 Nm (0.43 kg·m) at 3000
CarburetorHorizontal type butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash type
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity0.9 L (0.24 US gal, 0.20 lmp gal)
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Honda GV100 K1
Length, mm (in)390 (15.35)
Width, mm (in)357 (14.05)
Height, mm (in)227 (8.97)
Dry weight, kg (lb)8.9 (19.6)

Cylinder Block and Head

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:6.5:1
Bore x Stroke52 X 46 mm (2.04 x 1.81 in)
Sleeve internal diameter52.00 mm (2.0472 in)
Piston skirt outer diameter51.995 mm (2.0470 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop/second/oil0.100-0.135 mm (0.004-0.006 in)
Ring end gapTop/second0.15-0.30 mm (0.006-0.012 in)
Oil0.20-0.70 mm (0.008-0.030 in)
Connecting rod small end ID10.006 mm (0.395 in)
Connecting rod big end ID18.000 mm (0.709 in)
Crankshaft crank pin outer diameter17.984 mm (0.7080 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:Side valve (L-head)
Stem outer diameter (standard):INTAKE5.490 mm (0.0.2161 in)
EXHAUST5.445 mm (0.2144 in)
Cam height:INTAKE21.82 mm (0.859 in)
EXHAUST21.82 mm (0.859 in)
Valve spring free length:27.1 mm (1.07 in)


Maximum speed3000 rpm
Idle speed2000 ± 150 rpm
Cylinder compression2.0-4.0 kg/cm2 at 600 rpm
8.2 kg/cm2 at 1200 rpm
Valve clearance
Intake valve0.08-0.16 mm (0.031-0.0063 in)
Exhaust valve0.08-0.16 mm (0.031-0.0063 in)
Main jet#58
Float height12.0±1.5 mm (0.42-0.52 in)
Pilot screw opening2 3/8
Oil system
Oil typeHonda 4-stroke or an equivalent (SG.SF/CC.CD)
Recommended oilSAE 10W-30
Oil capacity0.4 L (0.42 US qt, 0.35 lmp qt)
Ignition system
Ignition timing20 ° B.T.D.C (Fixed)
Spark plugNGK: BMR-4A
Spark plug gap0.6-0.7 mm (0.024-0.028 in)
Primary ignition coil resistance0.7-0.9 kΩ
Secondary ignition coil resistance6.3-7.7 kΩ
Clearance to flywheel (air gap)0.2-0.6 mm (0.008-0.024 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
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