Honda GCV135

Honda GCV135The Honda GCV135 is a 135 cc (8.24 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Honda Motor Company for general-purpose applications.

The cylinder bore is 64.0 mm (2.52 in) and the piston stroke is 42.0 mm (1.65 in). The compression ratio rating is 8.5:1.

The GCV135 engine produced 4.5 PS (3.3 kW; 4.4 HP) at 3,600 rpm of maximum horsepower and 9.7 N·m (1 kg·m, 7.1 ft·lb) at 2,500 rpm of maximum torque.

The Honda GCV135 features:

  • OHV design
  • Transistorized magneto ignition system
  • Horizontal type carburetor with butterfly valve
  • Centrifugal govervor
  • Splash lubrication system
  • Forced air cooling system
  • Recoil starter

General information

Engine Specifications
Engine model GCV135
Engine type 4-stroke, OHV, single-cylinder
Displacement 135 cm3, (8.24 cu·in)
Max. horsepower 4.5 PS (3.3 kW; 4.4 HP) at 3,600 rpm
Max. torque 9.7 N·m (1 kg·m, 7.1 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Dry type
Lubricating system Splash
Ignition system Transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 230 g/HPh
Fuel tank capacity 0.9 L (0.24 US. gal. 0.2 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 351 x 331 x 353 mm (13.8 x 13 x 13.9 in)
Dry weight 9.5 kg (20.9 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 64.0 mm (2.52 in)
Piston stroke: 42.0 mm (1.65 in)
Cylinder internal diameter (standard): 64.000 mm (2.5197 in)
Piston skirt outer diameter (standard): 63.969 mm (2.5185 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 26.020 mm (1.0244 in)
Connecting rod small end diameter (standard): 13.005 mm (0.512 in)
Side clearance (Top): 0.015-0.045 mm (0.0006-0.0018 in)
Side clearance (Second): 0.015-0.045 mm (0.0006-0.0018 in)
Side clearance (Oil): 0.015-0.045 mm (0.0006-0.0018 in)
Ring end gap (Top): 0.200-0.350 mm (0.0079-0.0138 in)
Ring end gap (Second): 0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Oil): 0.150-0.350 mm (0.0059-0.0138 in)
Ring width (Top): 1.5 mm (0.0591 in)
Ring width (Second): 1.5 mm (0.0591 in)
Ring width (Oil): 2.5 mm (0.0984 in)
Crankshaft main journal diameter: PTO side: 27.993 (1.1021 in)
Flywheel side: 25.393 mm (0.9997 in)
Crankpin journal diameter: 25.980 mm (1.0228 in)
Crankshaft center distance: 21 mm (0.825 in)
Cylinder head
Valve arrangement: OHV
Valves: 2
Valve steam diameter (INTAKE): 5.480 mm (0.2157 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)

Tightening torque specs

Tightening torque specs
Air cleaner case bolt 10 Nm; 1.0 kg·m; 7 ft·lb
Connecting rod bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Valve adjusting lock nut 8 Nm; 0.8 kg·m; 5.8 ft·lb
Cylinder head cover bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Oil drain plug bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Flywheel nut 52 Nm; 5.3 kg·m; 38 ft·lb
Governor arm nut 10 Nm; 1.0 kg·m; 7 ft·lb
Muffler bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Recoil starter nut 8.5 Nm; 0.85 kg·m; 6.1 ft·lb
Fan cover stud bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Spark plug 20 Nm; 2.0 kg·m; 14 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: 1,550-1,850 rpm
Cylinder compression: 5.0 kg/cm2 (71 psi) at 600 rpm
Valve clearance
Intake valve clearance: 0.15±0.04 mm (0.006±0.002 in)
Exhaust valve clearance: 0.20±0.04 mm (0.008±0.002 in)
Oil system
Lubrication system: Splash
Oil type: Honda 4-stroke or an equivalent (SE or SF)
Recommended oil: SAE 10W-30
Oil capacity: 0.55 L (0.58 US. qt, 0.48 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #60
Float height: 9.2 mm (0.3622 in)
Pilot screw opening: 1-5/8 turns out
Ignition system
Type: Transistorized magneto ignition
Ignition timing: 20° B.T.D.C.
Spark plug: NGK BPR6ES
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque: 20 N·m (2 kg·m, 14.7 ft·lb)
Ignition coil air gap 0.2-0.6 mm (0.0079-0.0236 in)

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