The Honda GX35 is a 36 cc (2.2 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 39.0 mm (1.54 in) and 30.0 mm (1.18 in), respectively. The compression ratio rating is 8.0:1.
The Honda GX35 engine produced 1.6 PS (1.21 kW; 1.6 HP) at 7,000 rpm of maximum output power and 1.9 N·m (0.2 kg·m, 1.4 ft·lb) at 5,000 rpm of peak torque.
The Honda GX35 features:
- Overhead camshaft OHC design
- Transistorized magneto ignition system
- Diaphragm type carburetor with the accelerator pump
- Centrifugal governor
- Oil mist lubrication system
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | GX35 |
| Engine type | 4-stroke, OHC, single-cylinder |
| Displacement | 36 cm3, (2.2 cu·in) |
| Max. horsepower | 1.6 PS (1.21 kW; 1.6 HP) at 7000 rpm |
| Max. torque | 1.9 N·m (0.2 kg·m, 1.4 ft·lb) at 5000 rpm |
| Cooling system | Forced air |
| Air cleaner | – |
| Lubricating system | Oil mist |
| Ignition system | Transistorized magneto ignition |
| Fuel system | Diaphragm type carburetor with the accelerator pump |
| Fuel consumption | 265 g/HPh |
| Fuel tank capacity | 0.65 L (0.17 US. gal. 0.14 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.0:1 |
| Cylinder bore: | 39.0 mm (1.54 in) |
| Piston stroke: | 30.0 mm (1.18 in) |
| Cylinder internal diameter (standard): | 39.000 mm (1.5354 in) |
| Piston skirt outer diameter (standard): | 38.970-38.990 mm (1.5342-1.535 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 7.978-7.989 mm (0.3141-0.3145 in) |
| Side clearance (Top): | 0.015-0.056 mm (0.0006-0.0022 in) |
| Side clearance (Second): | 0.015-0.056 mm (0.0006-0.0022 in) |
| Ring end gap (Top): | 0.100-0.250 mm (0.0039-0.0098 in) |
| Ring end gap (Second): | 0.100-0.250 mm (0.0039-0.0098 in) |
| Ring width (Top): | 0.970-0.990 mm (0.0382-0.039 in) |
| Ring width (Second): | 0.970-0.990 mm (0.0382-0.039 in) |
| Crankshaft center distance: | 15 mm (0.59 in) |
| Cylinder head | |
| Valve arrangement: | OHC |
| Valves: | 2 |
| Valve steam diameter (INTAKE): | 3.470-3.485 mm (0.1366-0.1372 in) |
| Valve steam diameter (EXHAUST): | 3.435-3.450 mm (0.1352-0.1358 in) |
| Valve spring free length (INTAKE): | 21.770 mm (0.8571 in) |
| Valve spring free length (EXHAUST): | 21.770 mm (0.8571 in) |
| Camshaft lobe height (INTAKE): | 22.460 mm (0.8843 in) |
| Camshaft lobe height (EXHAUST): | 22.460 mm (0.8843 in) |
Tightening torque specs
| Tightening torque specs | |
| Lower crankcase | 6.4 Nm; 0.7 kg·m; 5.1 ft·lb |
| Fan cover | 6.4 Nm; 0.7 kg·m; 5.1 ft·lb |
| Reed valve plate | 3.0 Nm; 0.3 kg·m; 2.2 ft·lb |
| Ignition coil | 3.4 Nm; 0.35 kg·m; 2.5 ft·lb |
| Recoil starter pulley | 6.4 Nm; 0.7 kg·m; 4.6 ft·lb |
| Flywheel | 22.6 Nm; 2.3 kg·m; 16.7 ft·lb |
| Valve adjusting lock nut | 4.9 Nm; 0.5 kg·m; 3.6 ft·lb |
| Spark plug | 11.8 Nm; 1.2 kg·m; 8.7 ft·lb |
| Clutch bolt | 15.2 Nm; 1.5 kg·m; 11 ft·lb |
Service Data
| Idle speed: | 3,100 ± 200 rpm |
| Cylinder compression: | 9.2-11.2 kg/cm2 (131-159 psi) at 2,000 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.08 ± 0.02 mm (0.003 ± 0.001 in) |
| Exhaust valve clearance: | 0.10 ± 0.02 mm (0.004 ± 0.001 in) |
| Oil system | |
| Lubrication system: | Oil mist |
| Oil type: | Honda 4-stroke or an equivalent (SG, SF) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.10 L (0.11 US. qt, 0.09 Imp. qt.) |
| Fuel system | |
| Type: | Diaphragm type carburetor with the accelerator pump |
| Main jet: | #38 (SAU, SAUT and SUT types) #37 (For others) |
| Ignition system | |
| Type: | Transistorized magneto ignition |
| Ignition timing: | 27° B.T.D.C.(Fixed) |
| Spark plug: | NGK CMR8H |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
| Ignition coil air gap | 0.2-0.4 mm (0.0079-0.0157 in) |
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