Honda GCV520 Specifications
| Engine Model: Honda GCV520 |
| Engine Type: 4-cycle V-twin-cylinder OHC air-cooled gasoline |
| Total Displacement: 32.3 cu.in (530 cc) |
| Rated Engine Power: 14 Hp (10.4 kW) at 3600 rpm |
| Carburetor Type: Two-barrel with butterfly valve |
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Engine Model .............. Honda GCV520
Engine Type .............. 4-cycle overhead camshaft V-twin gasoline engine
Number of Cylinders .............. 2
Displacement, cu.in (cc) .............. 32.3 (530)
Cylinder Bore, in (mm) .............. 3.03 (77.0)
Piston Stroke, in (mm) .............. 2.26 (57.0)
Rated Engine Power, hp (kW) .............. 14.0 (10.4)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lbs) .............. 35.9 (26.5)
Torque Speed, rpm .............. 2500
Compression Ratio .............. 8.0:1
Valve Arrangement .............. OHC
PTO Shaft Rotation .............. Counterclockwise (from PTO side)
Lubrication System .............. Forced
Air Cleaner .............. Dual element
Cooling System .............. Forced air
Ignition System .............. Transistorized magneto
Stopping System .............. Primary circuit ground
Starting System .............. Recoil or electric starter
Fuel System Type .............. Carburetor
Carburetor Type .............. Horizontal, two barrels butterfly valve
Governor Type .............. Centrifugal
Fuel Consumption, lb/Hph (g/kWh) .............. 0.51 (313)
Fuel Type .............. Gasoline (86 or higher)
Overall Length, in (mm) .............. 18.0 (456)
Overall Width, in (mm) .............. 16.8 (427)
Overall Height, in (mm) .............. 13.0 (331)
Dry Weight, lbs (kg) .............. 67.2 (30.5)
Operating Weight, lbs (kg) .............. 69.4 (31.5)
Cylinder Bore Inside Diameter (Std), in (mm) .............. 3.0314-3.0320 (77.000-77.015)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) .............. 3.038 (77.170)
Connecting Rod Small End Inside Diameter (Std), in (mm) .............. 0.7089 (18.005)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) .............. 0.711 (18.07)
Connecting Rod Big End Inside Diameter (Std), in (mm) .............. 1.3789 (35.025)
Connecting Rod Big End Inside Diameter (Wear Limit), in (mm) .............. 1.381 (35.07)
Connecting Rod Big End Oil Clearance, in (mm) .............. 0.0016-0.0026 (0.040-0.066)
Crankshaft Journal Outside Diameter (PTO), in (mm) .............. 1.1021 (34.993)
Crankshaft Journal Outside Diameter (Flywheel), in (mm) .............. 0.9997 (34.393)
Crank Pin Outside Diameter (Std), in (mm) .............. 1.3774 (32.985)
Crank Pin Outside Diameter (Wear Limit), in (mm) .............. 1.3750 (32.92)
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.004±0.002 (0.10±0.04)
Exhaust Valve Clearance, in (mm) .............. 0.006±0.002 (0.15±0.04)
Intake Valve Stem Outside Diameter (Std), in (mm) .............. 0.216 (5.48)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.2094 (5.318)
Exhaust Valve Stem Outside Diameter (Std), in (mm) .............. 0.214 (5.44)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.2077 (5.275)
Valve Guide Inside Diameter (Intake/Exhaust), in (mm) .............. 0.217 (5.50)
Intake Valve Guide To Stem Clearance, in (mm) .............. 0.0006-0.0017 (0.015-0.047)
Exhaust Valve Guide To Stem Clearance, in (mm) .............. 0.0024-0.0034 (0.060-0.087)
Valve Seat Width (Intake/Exhaust), in (mm) .............. 0.028 (0.70)
Valve Spring Free Length, in (mm) .............. 1.34 (34.00)
Cam Height (Std), in (mm) .............. 1.5847 (40.521)
Cam Height (Wear Limit), in (mm) .............. 1.57 (39.80)
Piston Pin Bore Inside Diameter (Std), in (mm) .............. 0.7087-0.7090 (18.002-18.008)
Piston Pin Bore Inside Diameter (Wear Limit), in (mm) .............. 0.7103 (18.042)
Piston Skirt Outside Diameter, in (mm) .............. 3.0309 (76.985)
Piston to Cylinder Bore Clearance, in (mm) .............. 0.0006-0.0020 (0.015-0.050)
Piston Pin Outside Diameter (Std), in (mm) .............. 0.7084-0.7087 (17.994-18.000)
Piston Pin Outside Diameter (Wear Limit), in (mm) .............. 0.7068 (17.954)
Top Ring Width, in (mm) .............. 0.0783 (1.99)
Second Ring Width, in (mm) .............. 0.0783 (1.99)
Top Ring Groove Side Clearance, in (mm) .............. 0.0020-0.0031 (0.050-0.080)
Second Ring Groove Side Clearance, in (mm) .............. 0.0012-0.0024 (0.030-0.060)
Top Ring End Gap, in (mm) .............. 0.008-0.016 (0.20-0.40)
Second Ring End Gap, in (mm) .............. 0.008-0.016 (0.20-0.40)
Ring End Gap (Wear Limit), in (mm) .............. 0.04 (1.00)
Cylinder Bore Inside Diameter (Max), in (mm) .............. 3.038 (77.170)
Cylinder Compression, psi (kPa) .............. 85-114 (600-800)
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.004 (0.10)
Exhaust Valve Clearance, in (mm) .............. 0.006 (0.15)
Engine Oil Type (Summer) .............. SAE 10W-30, 15W-30
Engine Oil Type (Winter) .............. SAE 5W-30
API Service Classifications .............. SE or higher
Oil Capacity (with Filter), qts (L) .............. 1.37 (1.30)
Oil Filter Part Number .............. 15400-PFB-004
Air Filter Part Number .............. 17211-Z0A-013
Fuel Filter Part Number .............. 16910-ZV4-015
Spark Plug Type .............. NGK BPR5ES or Denso W16EPR-U
Spark Plug Gap, in (mm) .............. 0.028-0.032 (0.70-0.80)
Module Air Gap, in (mm) .............. 0.008-0.024 (0.20-0.60)
Ignition Timing, deg .............. 20 BTDC
Main Jet (No.1/2) .............. #76.3 / #78.8
Pilot Jet (No.1/2) .............. #35 / #35
Idle Fuel (No.1/2) .............. 1-3/8 turns out / 1-9/16 turns out
Float Height, in (mm) .............. 0.73 (18.5)
Low Idle Speed, rpm .............. 1400±150
High Idle Speed, rpm .............. 3300±150
Check Engine Oil Level .............. Every 10 hours
Clean Air Filter Element .............. Every 50 hours
Change Engine Oil .............. Every 100 hours
Replace Engine Oil Filter .............. Every 100 hours
Check and Adjust Spark Plug .............. Every 100 hours
Replace Fuel Filter .............. Every 200 hours
Check and Adjust Idle Speed .............. Every 200 hours
Check Carburetor Adjustments .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 200 hours
Replace Spark Plug .............. Every 200 hours
Replace Air Filter Element .............. Every 200 hours
Clean Combustion Chamber .............. Every 200 hours
Clean Fuel Lines .............. Every 200 hours
Oil Pan Bolt (M8x1.25), Nm (ft-lb) .............. 24 (17)
Cylinder Nut (M8x1.25), Nm (ft-lb) .............. 32 (24)
Starter Solenoid Nut (M8x1.25), Nm (ft-lb) .............. 12 (9)
Oil Drain Plug Bolt (M20x1.5), Nm (ft-lb) .............. 44 (33)
Connecting Rod Bolt (M6x1.0), Nm (ft-lb) .............. 12 (9)
Flywheel Bolt (M16x1.5), Nm (ft-lb) .............. 157 (116)
Oil Filter Holder (M20x1.5), Nm (ft-lb) .............. 18 (13)
Fuel Pump Screw (M5x0.8), Nm (ft-lb) .............. 3.1 (2.2)
Ignition Coil Stud Bolt (M6x1.0), Nm (ft-lb) .............. 12 (9)
Spark Plug (M14x1.25), Nm (ft-lb) .............. 20 (14)
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