The 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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