The 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:
- Overhead valve (OHV) 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 |
Be the first to comment