The Honda GCV520 is a small 530 cc (32.3 cu-in) 90° V-twin, air-cooled, four-stroke cycle, internal combustion gasoline engine with vertical shaft, manufactured by Honda Motor Company for general-purpose applications, such as: commercial lawn and garden equipment, tractors, construction and industrial equipment, agricultural equipment, small vehicles.
This engine has two cylinders, integrated cylinder, and head, overhead camshaft, two-barrel carburetor. The Honda GCV520 engine has transistorized magneto ignition, recoil or 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 GCV520 engine produces 14.1 PS (10.4 KW; 14.0 HP) at 3,600 rpm of maximum horsepower and 35.9 Nm (3.6 kg·m; 26.5 lbf·ft) at 2,500 rpm of peak torque .
General information
| Engine Specifications | |
| Model | GCV520 (vertical shaft) |
| Type | 4-stroke, OHC, V-twin 90° |
| Displacement | 530 cm 3 (32.3 cu-in) |
| Max. horsepower | 14.1 PS (10.4 KW; 14.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 35.9 Nm (3.6 kg·m; 26.5 lbf·ft) at 2,500 rpm |
| Carburetor | Horizontal type, two barrels, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition |
| Lubricating system | Splash type |
| Starting system | Recoil or 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) |
Dimensions and Weight
| GCV520 | |
| Length, mm (in) | 456 (18.0) |
| Width, mm (in) | 427 (16.8) |
| Height, mm (in) | 331 (13.0) |
| Dry weight, kg (lb) | 30.5 (67.2) |
| Operating weight, kg (lb) |
31.5 (69.4) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.0:1 | |
| Bore x Stroke | 77.0 mm X 57.0 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 | |
| Piston ring side clearance (Top): | 0.050-0.080 mm (0.0020-0.0031 in) | |
| Piston ring side clearance (Second): | 0.030-0.060 mm (0.0012-0.0024 in) | |
| Piston ring end gap (Top): | 0.20-0.40 mm (0.008-0.016 in) | |
| Piston ring end gap (Second): | 0.20-0.40 mm (0.008-0.016 in) | |
| Ring width (Top): | 1.990 mm (0.0783 in) | |
| Ring width (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: | OHC | |
| Valves: | 4 (2 per cylinder) | |
| Valve stem outer diameter (INTAKE): | 5.485 mm (0.2159 in) | |
| Valve stem outer diameter (EXHAUST): | 5.440 mm (0.214 in) | |
| Valve guide inner diameter (INTAKE): | 5.500 mm (0.2165 in) | |
| Valve guide inner diameter (EXHAUST): | 5.500 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 mm (0.004 ± 0.002 in) |
| Exhaust valve | 0.15 ± 0.04 mm (0.006 ± 0.002 in) |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.3 liters (1.37 US.qts, 1.14 Imp. qts) |
| 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 Ω |
| 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) |
| Carburetor | |
| Main jet | N.1 #76.2, N.2 #78.8 |
| Pilot jet | N.1,2 #35 |
| Float height | 18.5 mm (0.73 in) |
| Pilot screw opening |
N.1 1-3/8 turns out N.2 1-9/16 turns out |
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