Honda GX35

Honda GX35The Honda GX35 is a 35.8 cc, 2.2 cu-in) single-cylinder air-cooled four-stroke internal combustion ultra-small 360° inclinable gasoline engine manufactured by Honda Motor Company since 2002.

The Honda GX35 engine is a suitable power source for different applications like commercial lawn and garden equipment, tillers and cultivators, construction and industrial equipment, agricultural equipment, and water pumps.

This engine has an OHC design with valve rocker arms and camshaft driven by a maintenance-free, low-noise timing belt, makes the engine more compact and light. It has a recoil starter, diaphragm type carburetor with the accelerator pump, transistorized magneto ignition.

The cylinder bore is 39.0 mm (1.5 in) and the piston stroke is 30.0 mm (1.2 in). The Honda GX35 mini-motor produced 1.6 PS (1.21 kW) at 7000 rpm and 1.9 Nm (0.19 kg·m, 1.4 ft·lb) at 5000 rpm.

General information

Engine Specifications
Model GX35
Type 4-stroke, OHC, single cylinder
Displacement 35.8 cm 3 (2.2 cu-in)
Max. horsepower 1.6 PS (1.21 kW) at 7,000 rpm
Max. torque 1.9 Nm (0.19 kg·m, 1.4 ft·lb) at 5,000 rpm
Carburetor Diaphragm type
Cooling system Forced-air
Ignition system Transistorized magneto ignition
Lubricating system Oil mist
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 0.65 L (0.17 US gal, 0.14 lmp gal)
Fuel consumption 360 g/kWh (265 g/HPh, 0.58 lb/HPh)
PTO shaft rotation Counterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.0:1
Bore x Stroke 39 X 30 mm (1.5 x 1.2 in)
Sleeve internal diameter 39.00 mm (1.535 in)
Piston skirt outer diameter 38.970-38.990 mm (1.534-1.535 in)
Connecting rod small end ID 7.978-7.989 mm (0.3141-0.3145 in)
Ring end gap Top/second 0.10-0.25 mm (0.004-0.010 in)
Ring width Top/second 0.970-0.990 mm (0.038-0.039 in)
Side clearance Top/second 0.015-0.056 mm (0.0006-0.0022 in)
Cylinder Head
Warpage (max) 0.2 mm (0.01 in)
Valve Arrangement: OHC
Valves: 2
Stem outer diameter (standard): INTAKE 3.470-3.485 mm (0.1366-0.1372 in)
EXHAUST 3.435-3.450 mm (0.1352-0.1358 in)
Valve guide internal diameter 3.50-3.52 mm (0.1378-0.1385 in)
Valve spring free length 21.77 mm (0.8570 in)
Cam height: INTAKE 22.46 mm (0.884 in)
EXHAUST 22.46 mm (0.884 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

Maintenance data

Engine
Idle speed 3100 ± 200 rpm
Cylinder compression 9.2-11.2 kg/cm2 (131-159 psi) at 2,000 rpm
Valve clearance
Intake valve 0.08 ± 0.02
Exhaust valve 0.11 ± 0.02
Carburetor
Main jet #38 (SAU, SAUT and SUT types)
#37 (For others)
Oil system
Oil type Honda 4-stroke or an equivalent (SG, SF)
Recommended oil SAE 10W-30
Oil capacity 0.10 L (3.4 US oz, 3.5 lmp oz)
Ignition system
Ignition timing 27 ° B.T.D.C (Fixed)
Spark plug NGK: CMR8H
Spark plug gap 0.6-0.7 mm (0.024-0.028 in)
Primary ignition coil resistance 0.7-0.9 Ω
Secondary ignition coil resistance 6.1-9.3 kΩ
Ignition coil air gap 0.2-0.4 mm (0.008-0.016 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

2 Comments

  1. I am kinda of stunned as this is a very small engine and I would have thought that Honda would be crowing about it’s light weight but I don’t see weight in the specs.Do you know what it is? Cheers, Brad.Brad.

    • The GX35 weighs 7.6 pounds dry. Also, it is OHC, not OHV. In the photo, you can clearly read “OHC” in the red shroud near the top of the engine.

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