Honda GXV57

The Honda GXV57 is a small 0.057 L (57 cc, 3.48 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, high compression ratio for better fuel efficiency and a ball bearing supported crankshaft for greater stability. The Honda GXV57 engine is equipped with transistorized magneto ignition, horizontal type carburetor, and recoil starter.

The GXV57 engine a compression ratio rating is 8.0:1, cylinder bore and piston stroke are 45.0 mm (1.77 in) and 36.0 mm (1.42 in), respectively. The GXV57 engine produces 2.0 HP (1.5 kW) at 4,800 rpm and 3.2 N·m (0.33 kg·m, 2.36 ft·lb) of torque at 4,600 rpm.

General information

Engine Specifications
ModelGXV57
Type4-stroke, OHV, single cylinder
Displacement57 cm 3 (3.48 cu-in)
Max. horsepower2.0 HP (1.5 kW) at 4,800 rpm
Max. torque (crank PTO)3.2 N·m (0.33 kg·m, 2.36 ft·lb) at 4,600 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity0.27 L
Fuel consumption250 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:8.0:1
Bore x Stroke45.0 mm X 36 mm (1.77 x 1.42 in)
Sleeve internal diameter45.000-45.015 mm (1.7717-1.7722 in)
Piston skirt outer diameter44.970-44.990 mm (1.7705-1.7713 in)
Ring side clearanceTop/second0.015-0.050 mm (0.0006-0.0020 in)
Ring end gapTop0.10-0.25 mm (0.0039-0.0138 in)
Second0.25-0.40 mm (0.098-0.0157 in)
Ring widthTop0.97-0.99 mm (0.038-0.039 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
Valves:2
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
Flywheel nut24 Nm; 2.4 kg·m; 18 ft·lb
Igniton coil bolt7.3 Nm; 0.75 kg·m; 5.4 ft·lb
Carburetor drain screw1.2 Nm; 0.12 kg·m; 0.9 ft·lb
Others
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

Engine
Maximum speed4,250 ± 150 rpm
Idle speed2,200 ± 200 rpm
Cylinder compression2.8 kg/cm2 (39.8 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 timing21° B.T.D.C.
Spark plugNGK: CR4HSB
DENSO: U14FSR-UB
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)
Carburetor
Main jet#50
Float height12 mm (0.47 in)
Pilot screw opening1-5/8 turns out
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