The Honda GXV520 is a small (530 cc, 32.3 cu-in) 90° V-twin air-cooled four-stroke internal combustion gasoline engine with vertical shaft, manufactured by Honda Motor Company.
The Honda GXV520 motor has two cylinders, integrated cylinder, and head, overhead camshaft, two-barrel carburetor. The engine is equipped with transistorized magneto ignition; centrifugal governor and electric starter.
Cylinder bore and piston stroke are 77.0 mm (3.0 in) and 57.0 mm (2.2 in), respectively. Compression ratio rating is 8.0:1. The GXV520 produces 13.1 HP (9.8 kW; 13.3 PS) at 3,600 rpm of net output power and 32.9 N·m (3.35 kg·m, 24.3 ft·lb) at 2,500 rpm of net torque.
General information
| Engine Specifications | |
| Model | GXV520 |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 530 cm 3 (32.3 cu-in) |
| Max. horsepower | 13.1 HP (9.8 kW; 13.3 PS) at 3,600 rpm |
| Max. torque (crank PTO) | 32.9 N·m (3.35 kg·m, 24.3 ft·lb) at 2,500 rpm |
| Carburetor | Horizontal type, two barrels, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition |
| Lubricating system | Splash |
| Starting system | Electric starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | – |
| Fuel consumption | 230 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.0:1 | |
| Bore x Stroke | 77 mm X 57 mm (3.0 x 2.2 in) | |
| Sleeve internal diameter | 77.00 mm (3.031 in) | |
| Piston skirt outer diameter | 76.985 mm (3.1096 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top | 0.050-0.080 mm (0.0020-0.0031 in) |
| Second | 0.030-0.060 mm (0.0012-0.0024 in) | |
| Ring end gap | Top/Second | 0.20-0.40 mm (0.008-0.016 in) |
| Ring width | Top/second | 1.990 mm (0.0783 in) |
| Connecting rod small end ID | 18.005 mm (0.7089 in) | |
| Connecting rod big end ID | 35.025 mm (1.3789 in) | |
| Crankpin outer diameter | 34.985 mm (1.3774 in) | |
| Main journal outer diameter | PTO side | 30.993 mm (1.2202 in) |
| Flywheel side | 34.993 mm (1.3777 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 4 (2 per cylinder) | |
| Stem outer diameter (standard): | INTAKE | 5.485 mm (0.2159 in) |
| EXHAUST | 5.440 mm (0.214 in) | |
| Guide internal diameter | INTAKE / EXHAUST | 5.5 mm (0.2165 in) |
| Spring free length | 34.0 mm (1.34 in) | |
| Cam height: | 40.251 mm (1.5847 in) | |
| Cam pulley shaft outer diameter: | 9.987 mm (0.3932 in) | |
| Rocker arm internal diameter: | 6.000 mm (0.2362 in) | |
| Rocker arm shaft outer diameter: | 5.990 mm (0.2358 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder nut | 32 Nm; 3.3 kg·m; 24 ft·lb |
| Connecting rod bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Oil drain bolt | 44 Nm; 4.5 kg·m; 33 ft·lb |
| Oil filter holder | 18 Nm; 1.8 kg·m; 13 ft·lb |
| Oil filter | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Valve adjusting lock nut | 7.5 Nm; 0.75 kg·m; 5.4 ft·lb |
| Governor fork screw | 5.5 Nm; 0.55 kg·m; 4.0 ft·lb |
| Flywheel bolt | 157 Nm; 16.0 kg·m; 116 ft·lb |
| Ignition coil stud bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Fuel pump screw | 3 Nm; 0.3 kg·m; 2.2 ft·lb |
| Breather valve bolt | 5.5 Nm; 0.55 kg·m; 4.0 ft·lb |
| Oil pan bolt | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Starter solenoid nut | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Starter solenoid terminal nut | 9 Nm; 0.9 kg·m; 6.5 ft·lb |
| Through bolt | 7 Nm; 0.7 kg·m; 5.1 ft·lb |
| Fuel drain screw | 4 Nm; 0.4 kg·m; 2.9 ft·lb |
| Air vent cover screw | 2 Nm; 0.2 kg·m; 1.4 ft·lb |
| Others | |
| 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 |
| 8 mm bolts, nuts | 24 Nm; 2.4 kg·m; 17 ft·lb |
| 10 mm bolts, nuts | 37 Nm; 3.7 kg·m; 27 ft·lb |
| 12 mm bolts, nuts | 55 Nm; 5.5 kg·m; 39.5 ft·lb |
Service Information
| Engine | |
| Maximum speed | 3,000 ± 150 rpm |
| Idle speed | 1,400 ± 150 rpm |
| Cylinder compression | 6.0-8.0 kg/cm2 (85-114 psi) at 600 rpm |
| Valve clearance | |
| Intake valve | 0.10 ± 0.04 (0.004 ± 0.002) |
| Exhaust valve | 0.15 ± 0.04 (0.006 ± 0.002) |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30 |
| Oil capacity |
With oil filter: 1.0 l (1.06 US. qt, 0.88 Imp. qt.) Withput oil filter: 0.9 l (0.95 US. qt, 0.79 Imp. qt.) |
| Ignition system | |
| Ignition timing | 20° B.T.D.C. |
| Spark plug | NGK: BPR5ES DENSO: W16EPR-U |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Primary ignition coil resistance | 1.0-1.2 kΩ |
| Secondary ignition coil N1 resistance | 9.2-14.0 kΩ |
| Secondary ignition coil N2 resistance | 9.8-14.8 kΩ |
| Ignition coil air gap | 0.2-0.6 mm (0.008-0.024 in) |
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