Honda GXV50

Honda GXV50 engineThe Honda GXV50 is a small (49 cc, 2.99 cu-in) single-cylinder air-cooled 4-stroke internal combustion gasoline engine with vertical shaft, manufactured by Honda Motor Company.

This engine has a single-cylinder, overhead-valve, and precision camshaft design, the high compression ratio for better fuel efficiency and a ball bearing supported crankshaft for greater stability. The Honda GXV50 engine has transistorized magneto ignition, horizontal type carburetor, and recoil starter.

A 41.8 mm (1.65 in) cylinder bore and 36 mm (1.42 in) piston stroke give the engine a total of 49 cc (2.99 cu-in) of displacement. Compression ratio rating is 8.0:1. The GXV50 engine produces 1.8 kW (2.5 HP) at 7,000 rpm and 3.04 N·m (0.31 kg·m, 2.25 ft·lb) of torque at 4,500 rpm.

General information

Engine Specifications
ModelGXV50 (vertical shaft)
Type4-stroke, OHV, single cylinder
Displacement49 cm 3 (2.99 cu-in)
Max. horsepower2.5 HP (1.8 kW) at 7,000 rpm
Max. torque (crank PTO)3.04 N·m (0.31 kg·m, 2.25 ft·lb) at 4,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil or electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity0.5 l (0.53 US. Gal, 0.44 Imp. Gal.)
Fuel consumption250 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Length, mm (in)249 (9.8)
Width, mm (in)286 (11.3)
Height, mm (in)225 (8.9)198 (7.8)
Dry weight, kg (lb)5.2 (11.47)
weight, kg (lb)
5.7 (12.57)

Cylinder Block and Head

Cylinder block
Compression ratio:8.0:1
Bore x Stroke41.8 mm X 36 mm (1.65 x 1.42 in)
Sleeve internal diameter41.800-41.815 mm (1.6457-1.6463 in)
Piston skirt outer diameter41.770-41.790 mm (1.6445-1.6453 in)
Ring side clearanceTop/second0.015-0.050 mm (0.0006-0.0020 in)
Ring end gapTop/Second0.15-0.30 mm (0.0059-0.0118 in)
Ring widthTop0.77-0.79 mm (0.030-0.031 in)
Second0.97-0.99 mm (0.038-0.039 in)
Connecting rod small end ID10.006-10.007 mm (0.3939-0.3944 in)
Connecting rod big end ID15.000-15.011 mm (0.5906-0.5910 in)
Crankpin outer diameter14.973-14.984 mm (0.5895-0.5899 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Stem outer diameter (standard):INTAKE3.970-3.985 mm (0.1563-0.1569 in)
EXHAUST3.935-3.950 mm (0.1549-0.1555 in)
Spring free length23.7.0 mm (0.93 in)
Cam height27.972 mm (1.1013 in)

Tightening torque specs

Tightening torque specs
Spark plug12 Nm; 1.2 kg·m; 8.6 ft·lb
Connecting rod bolt6 Nm; 0.6 kg·m; 4.3 ft·lb
Crankcase cover bolt7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Oil case bolt7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Valve cover bolt6 Nm; 0.6 kg·m; 4.3 ft·lb
Oil drain bolt11 Nm; 1.1 kg·m; 8 ft·lb
Flywheel nut21 Nm; 2.1 kg·m; 15 ft·lb
Fuel tank bolt10 Nm; 1.0 kg·m; 7 ft·lb
Igniton coil bolt6 Nm; 0.6 kg·m; 4.3 ft·lb
Fan caver stud bolt6 Nm; 0.6 kg·m; 4.3 ft·lb
Governor arm nut7 Nm; 0.7 kg·m; 5.1 ft·lb
Carburetor drain bolt4.5 Nm; 0.45 kg·m; 3.3 ft·lb
4 mm bolts, nuts3.5 Nm; 0.35 kg·m; 2.5 ft·lb
5 mm bolts, nuts5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts10 Nm; 1.0 kg·m; 7 ft·lb

Service Information

Maximum speed4,800 ± 150 rpm
Idle speed2,500 ± 200 rpm
Cylinder compression4.3 kg/cm2 (61.2 psi) at 1000 rpm
Valve clearance
Intake valve0.06-0.10 mm (0.0024-0.0039 in)
Exhaust valve0.09-0.13 mm (0.0035-0.0051 in)
Oil system
Oil typeHonda 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30
Oil capacity0.25 l (0.26 US. qt, 0.22 Imp. qt.)
Ignition system
Ignition timing30° B.T.D.C.
Spark plugNGK: CR5HSB
Spark plug gap0.6-0.7 mm (0.024-0.028 in)
Spark plug tightening torque12 Nm; 1.2 kg·m; 8.6 ft·lb
Primary ignition coil resistance0.98-1.20 kΩ
Secondary ignition coil resistance8-10 kΩ
Ignition coil air gap0.3-0.5 mm (0.012-0.020 in)
Main jet#55
Float height12 mm (0.47 in)
Pilot screw opening1-1/8 turns out
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