Honda GX35

Honda GX35The 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 modelGX35
Engine type4-stroke, OHC, single-cylinder
Displacement36 cm3, (2.2 cu·in)
Max. horsepower1.6 PS (1.21 kW; 1.6 HP) at 7000 rpm
Max. torque1.9 N·m (0.2 kg·m, 1.4 ft·lb) at 5000 rpm
Cooling systemForced air
Air cleaner
Lubricating systemOil mist
Ignition systemTransistorized magneto ignition
Fuel systemDiaphragm type carburetor with the accelerator pump
Fuel consumption265 g/HPh
Fuel tank capacity0.65 L (0.17 US. gal. 0.14 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (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
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 crankcase6.4 Nm; 0.7 kg·m; 5.1 ft·lb
Fan cover6.4 Nm; 0.7 kg·m; 5.1 ft·lb
Reed valve plate3.0 Nm; 0.3 kg·m; 2.2 ft·lb
Ignition coil3.4 Nm; 0.35 kg·m; 2.5 ft·lb
Recoil starter pulley6.4 Nm; 0.7 kg·m; 4.6 ft·lb
Flywheel22.6 Nm; 2.3 kg·m; 16.7 ft·lb
Valve adjusting lock nut4.9 Nm; 0.5 kg·m; 3.6 ft·lb
Spark plug11.8 Nm; 1.2 kg·m; 8.7 ft·lb
Clutch bolt15.2 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 gap0.2-0.4 mm (0.0079-0.0157 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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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