Honda GXV57

Honda GXV57The Honda GXV57 is a 57 cc (3.48 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, such as lightweight trimmers, tillers and hover mowers.

This engine produced 2.0 PS (1.5 kW; 2.0 HP) at 4,800 rpm of horsepower and 3.2 N·m (0.3 kg·m, 2.4 ft·lb) at 4,600 rpm of torque. Cylinder bore and piston stroke are 45.0 mm (1.77 in) and 36.0 mm (1.42 in), respectively. The compression ratio rating is 8.0:1.

The Honda GV100 features:

  • The overhead valves disegn
  • Transistorized magneto ignition system
  • Horizontal carburetor with a butterfly valve
  • Splash type lubrication system
  • Forced air cooling system
  • Recoil starter with an automatic decompression system

General information

Engine Specifications
Engine model GXV57
Engine type 4-stroke, OHV, single-cylinder
Displacement 57 cm3, (3.48 cu·in)
Max. horsepower 2.0 PS (1.5 kW; 2.0 HP) at 4,800 rpm
Max. torque 3.2 N·m (0.3 kg·m, 2.4 ft·lb) at 4,600 rpm
Cooling system Forced air
Lubricating system Splash type
Ignition system Transistorized magneto ignition
Fuel system Horizontal carburetor with butterfly valve
Fuel consumption 0.58 L/h at 4,600 rpm
Fuel tank capacity 0.27 L (0.07 US. gal. 0.06 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 249 x 286 x 240 mm (9.8 x 11.3 x 9.4 in)
Dry weight 5.4 kg (11.9 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.0:1
Cylinder bore: 45.0 mm (1.77 in)
Piston stroke: 36.0 mm (1.42 in)
Cylinder internal diameter (standard): 45.000-45.015 mm (1.7717-1.7722 in)
Piston skirt outer diameter (standard): 44.970-44.990 mm (1.7705-1.7713 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 15.000-15.011 mm (0.5906-0.591 in)
Connecting rod small end diameter (standard): 10.006-10.007 mm (0.3939-0.394 in)
Side clearance (Top): 0.015-0.050 mm (0.0006-0.002 in)
Side clearance (Second): 0.015-0.050 mm (0.0006-0.002 in)
Ring end gap (Top): 0.10-0.25 mm (0.0039-0.0098 in)
Ring end gap (Second): 0.25-0.40 mm (0.0098-0.0157 in)
Ring width (Top): 0.97-0.99 mm (0.0382-0.039 in)
Ring width (Second): 0.97-0.99 mm (0.0382-0.039 in)
Crankpin journal diameter: 14.973-4.984 mm (0.5895-0.1962 in)
Crankshaft center distance: 18.0 mm (0.71 in)
Cylinder head
Valve arrangement: OHV
Valves: 2
Valve steam diameter (INTAKE): 3.970-3.985 mm (0.1563-0.1569 in)
Valve steam diameter (EXHAUST): 3.935-3.950 mm (0.1549-0.1555 in)
Valve spring free length (INTAKE): 23.7 mm (0.9331 in)
Valve spring free length (EXHAUST): 23.7 mm (0.9331 in)
Camshaft lobe height (INTAKE): 27.972 mm (1.1013 in)
Camshaft lobe height (EXHAUST): 27.972 mm (1.1013 in)

Tightening torque specs

Tightening torque specs
Spark plug 12 Nm; 1.2 kg·m; 8.6 ft·lb
Connecting rod bolt 6 Nm; 0.6 kg·m; 4.3 ft·lb
Crankcase cover bolt 7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Oil case bolt 7.5 Nm; 0.75 kg·m; 5.4 ft·lb
Flywheel nut 24 Nm; 2.4 kg·m; 18 ft·lb
Igniton coil bolt 7.3 Nm; 0.75 kg·m; 5.4 ft·lb
Carburetor drain screw 1.2 Nm; 0.12 kg·m; 0.9 ft·lb
Others
4 mm bolts, nuts 3.5 Nm; 0.35 kg·m; 2.5 ft·lb
5 mm bolts, nuts 5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts 10 Nm; 1.0 kg·m; 7 ft·lb

Service Data

The Honda 4-stroke or an equivalent (SE or SF) oil with a viscosity of SAE 10W-30 is recommended for the GXV57, refilling oil capacity is 0.25 L (0.26 US. qt, 0.22 Imp. qt.). Recommended spark plug is NGK: CR4HSB; DENSO: U14FSR-UB with 0.6-0.7 mm (0.0236-0.0276 in) spark plug gap.

The valve clearance is 0.06-0.10 mm (0.0024-0.0039 in) for intake valves and 0.09-0.13 mm (0.0035-0.0051 in) for exhaust valves. Standard cylinder compression is 2.8 kg/cm2 (39.8 psi) at 1,000 rpm.

Engine
Maximum speed: 4,250± 150 rpm
Idle speed: 2,200± 200 rpm
Cylinder compression: 2.8 kg/cm2 (39.8 psi) at 1,000 rpm
Valve clearance
Intake valve clearance: 0.06-0.10 mm (0.0024-0.0039 in)
Exhaust valve clearance: 0.09-0.13 mm (0.0035-0.0051 in)
Oil system
Lubrication system: Splash type
Oil type: SAE 10W-30
Recommended oil: Honda 4-stroke or an equivalent (SE or SF)
Oil capacity: 0.25 L (0.26 US. qt, 0.22 Imp. qt.)
Fuel system
Type: Horizontal carburetor with butterfly valve
Main jet: #50
Float height: 12.0 mm (0.4724 in)
Pilot screw opening: 1-5/8 turns out turns out
Ignition system
Type: Transistorized magneto ignition
Ignition timing: 21° B.T.D.C.
Spark plug: NGK: CR4HSB; DENSO: U14FSR-UB
Spark plug gap: 0.6-0.7 mm (0.0236-0.0276 in)
Spark plug torque: 12 N·m (1.2 kg·m, 8.8 ft·lb)
Ignition coil air gap 0.3-0.5 mm (0.0118-0.0118 in)

Applications

Manufacturer or Brand Models
Tillers
Honda F220

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