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:
- 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: | 0.06-0.10 mm (0.0024-0.0039 in) |
Exhaust valve clearance: | 0.09-0.13 mm (0.0035-0.0051 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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