Honda GCV520

Honda GCV520The 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:

  • OHV 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, OHV, 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: OHV
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 rpm
Idle speed: 1,450±150 rpm 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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