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:
- OHC 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, OHC, 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: | OHC |
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: | 1,700±150 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) |
We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.
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