The Honda GCV520 is a 530 cc (32.34 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Honda Motor Company for general-purpose applications.
A 77.0 mm (3.03 in) cylinder bore and 57.0 mm (2.24 in) piston stroke give the GCV520 engine a total of 530 cc of displacement. The compression ratio rating is 8.0:1.
This engine produced 14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm of horsepower and 35.9 N·m (3.7 kg·m, 26.5 ft·lb) at 2,500 rpm of torque.
The Honda GCV520 features:
- OHC design
- Transistorized magneto ignition system
- Horizontal type, two barrels carburetor with butterfly valve
- Centrifugal govervor
- Forced lubrication system
- Forced air cooling system
- Recoil and electric starter or electric starter only
General information
| Engine Specifications | |
| Engine model | GCV520 |
| Engine type | 4-stroke, OHC, V-twin |
| Displacement | 530 cm3, (32.34 cu·in) |
| Max. horsepower | 14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm |
| Max. torque | 35.9 N·m (3.7 kg·m, 26.5 ft·lb) at 2,500 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual-element type |
| Lubricating system | Forced lubrication |
| Ignition system | Transistorized magneto ignition |
| Fuel system | Horizontal type, two barrels carburetor with butterfly valve |
| Fuel consumption | 230 g/HPh |
| Fuel tank capacity | – |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil and electric starter or electric starter on |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal govervor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 456 x 427 x 331 mm (18 x 16.8 x 13 in) |
| Dry weight | 30.5 kg (67.2 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.0:1 |
| Cylinder bore: | 77.0 mm (3.03 in) |
| Piston stroke: | 57.0 mm (2.24 in) |
| Cylinder internal diameter (standard): | 77.000 mm (3.0315 in) |
| Piston skirt outer diameter (standard): | 76.985 mm (3.0309 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 35.025 mm (1.3789 in) |
| Connecting rod small end diameter (standard): | 18.005 mm (0.7089 in) |
| Side clearance (Top): | 0.050-0.080 mm (0.002-0.0031 in) |
| Side clearance (Second): | 0.050-0.080 mm (0.002-0.0031 in) |
| Ring end gap (Top): | 0.20-0.40 mm (0.0079-0.0157 in) |
| Ring end gap (Second): | 0.20-0.40 mm (0.0079-0.0157 in) |
| Ring width (Top): | 1.990 mm (0.0783 in) |
| Ring width (Second): | 1.990 mm (0.0783 in) |
| Crankshaft main journal diameter: | PTO side: 30.993 mm (1.22027 in) Flywheel side: 34.993 mm (1.3777 in) |
| Crankpin journal diameter: | 34.985 mm (1.3774 in) |
| Crankshaft center distance: | 28.5 mm (1.12 in) |
| Cylinder head | |
| Valve arrangement: | OHC |
| Valves: | 2 (4 valves in total) |
| Valve steam diameter (INTAKE): | 5.485 mm (0.2159 in) |
| Valve steam diameter (EXHAUST): | 5.440 mm (0.2142 in) |
| Valve spring free length (INTAKE): | 34.0 mm (1.3386 in) |
| Valve spring free length (EXHAUST): | 34.0 mm (1.3386 in) |
| Camshaft lobe height (INTAKE): | 40.251 mm (1.5847 in) |
| Camshaft lobe height (EXHAUST): | 40.251 mm (1.5847 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 Data
| Engine | |
| Maximum speed: | 3,000±150 rpm |
| Idle speed: | 1,450±150 rpm |
| Cylinder compression: | 6.0-8.0 kg/cm2 (85-114 psi) at 600 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.10±0.04 mm (0.004±0.002 in) |
| Exhaust valve clearance: | 0.15±0.04 mm (0.006±0.002 in) |
| Oil system | |
| Lubrication system: | Forced lubrication |
| Oil type: | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | at disassembly (with oil filter): 1.3 L (1.37 US. qt, 1.14 Imp. qt.) at replacement (w/out oil filter): 0.9 L (0.95 US.qt, 0.79 Imp. qt.) at replacement (with oil filter): 1.05 L (1.11 US.qt, 0.92 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal type, two barrels carburetor with butterfly valve |
| Main jet: | N.1 #76.2, N.2 #78.8 |
| Pilot jet: | N.1,2 #35 |
| Float height: | 18.5 mm (0.7283 in) |
| Pilot screw opening: | N.1 1-3/8 turns out N.2 1-9/16 turns out turns out |
| Ignition system | |
| Type: | Transistorized magneto ignition |
| Ignition timing: | 20° B.T.D.C. |
| Spark plug: | NGK BPR5ES, DENSO W16EPR-U |
| Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
| Ignition coil air gap | 0.2-0.6 mm (0.0079-0.0236 in) |
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