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 | |
| Model | GXV57 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 57 cm 3 (3.48 cu-in) |
| Max. horsepower | 2.0 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 |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition |
| Lubricating system | Splash |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 0.27 L |
| Fuel consumption | 250 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.0:1 | |
| Bore x Stroke | 45.0 mm X 36 mm (1.77 x 1.42 in) | |
| Sleeve internal diameter | 45.000-45.015 mm (1.7717-1.7722 in) | |
| Piston skirt outer diameter | 44.970-44.990 mm (1.7705-1.7713 in) | |
| Ring side clearance | Top/second | 0.015-0.050 mm (0.0006-0.0020 in) |
| Ring end gap | Top | 0.10-0.25 mm (0.0039-0.0138 in) |
| Second | 0.25-0.40 mm (0.098-0.0157 in) | |
| Ring width | Top | 0.97-0.99 mm (0.038-0.039 in) |
| Second | 0.97-0.99 mm (0.038-0.039 in) | |
| Connecting rod small end ID | 10.006-10.007 mm (0.3939-0.3944 in) | |
| Connecting rod big end ID | 15.000-15.011 mm (0.5906-0.5910 in) | |
| Crankpin outer diameter | 14.973-14.984 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): | INTAKE | 3.970-3.985 mm (0.1563-0.1569 in) |
| EXHAUST | 3.935-3.950 mm (0.1549-0.1555 in) | |
| Spring free length | 23.7.0 mm (0.93 in) | |
| Cam height | 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 Information
| Engine | |
| Maximum speed | 4,250 ± 150 rpm |
| Idle speed | 2,200 ± 200 rpm |
| Cylinder compression | 2.8 kg/cm2 (39.8 psi) at 1000 rpm |
| Valve clearance | |
| Intake valve | 0.06-0.10 mm (0.0024-0.0039 in) |
| Exhaust valve | 0.09-0.13 mm (0.0035-0.0051 in) |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.25 l (0.26 US. qt, 0.22 Imp. qt.) |
| Ignition system | |
| Ignition timing | 21° B.T.D.C. |
| Spark plug | NGK: CR4HSB DENSO: U14FSR-UB |
| Spark plug gap | 0.6-0.7 mm (0.024-0.028 in) |
| Spark plug tightening torque | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Primary ignition coil resistance | 0.98-1.20 kΩ |
| Secondary ignition coil resistance | 8-10 kΩ |
| Ignition coil air gap | 0.3-0.5 mm (0.012-0.020 in) |
| Carburetor | |
| Main jet | #50 |
| Float height | 12 mm (0.47 in) |
| Pilot screw opening | 1-5/8 turns out |
Author:
Nice want this engine