The Honda GC135 is a 135 cc (8.24 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications.
Cylinder bore and piston stroke are 64.0 mm (2.52 in) and 42.0 mm (1.65 in), respectively. The compression ratio rating is 8.5:1.
This engine produced 4.0 PS (2.9 kW; 4.0 HP) at 3,600 rpm of horsepower and 8.6 N·m (0.9 kg·m, 6.3 ft·lb) at 2,500 rpm of torque.
The Honda GC135 features:
- OHV design
- Transistorized magneto ignition system
- Horizontal type carburetor with butterfly valve
- Centrifugal govervor
- Splash type lubrication system
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | GC135 |
| Engine type | 4-stroke, OHC, single-cylinder |
| Displacement | 135 cm3, (8.24 cu·in) |
| Max. horsepower | 4.0 PS (2.9 kW; 4.0 HP) at 3,600 rpm |
| Max. torque | 8.6 N·m (0.9 kg·m, 6.3 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 | 1.7 L (0.45 US. gal. 0.37 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 (Type S) (L x W X H) | 321 x 369 x 315 mm (12.6 x 14.5 x 12.4 in) |
| Dry weight | 11.2 kg (24.7 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 mm (1.1021 in) Flywheel side: 25.393 mm (0.9997 in) |
| Crankpin journal diameter: | 25.980 mm (1.0228 in) |
| Crankshaft center distance: | 21.0 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
| Tightening torque specs | |
| Air cleaner case bolt | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Crankcase cover bolt | 12 Nm; 1.2 kg·m; 8.6 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 |
| Fuel tank bolt, nut | 10 Nm; 1.0 kg·m; 7 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: | 3,800±150 rpm |
| Idle speed: | 1,400±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: | 0.58 L (0.61 US. qt, 0.51 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: | 2 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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