Honda G35

Honda G35 engineThe Honda GX35 is a 144 cc single-cylinder air-coolled four-stroke internal combustion small gasoline (petrol) motor manufactured by Honda Motor Company.

The Honda G35 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. It has a recoil starter, horizontal carburetor with butterfly valve and high voltage ignition.

Bore is 64.0 mm (2.52 in) and stroke is 45.0 mm (1.77 in). The G35 produced 3.54 PS (3.5 HP, 2.61 kW) at 4000 rpm and 6.5 Nm (0.66 kg·m, 4.77 ft·lb) at 3000 rpm and compression ratio rating is 6.4:1.

General information

Engine Specifications
Type4-stroke, side valve type (L-head), single cylinder
Displacement144 cm 3 (8.79 cu-in)
Max. horsepower3.54 PS (3.5 HP, 2.61 kW) at 4000 rpm
Max. torque6.5 Nm (0.66 kg·m, 4.77 ft·lb) at 3000 rpm
CarburetorHorizontal, butterfly valve
Cooling systemForced-air
Ignition systemHigh voltage ignition
Lubricating systemSplash system
Starting systemRecoil starter or rope starting
Stoping systemGround switch
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity2.5 L (1.27 US gal, 1.06 lmp gal)
Fuel consumption310 g/HPh (0.68 lb/HPh)
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:6.4:1
Bore x Stroke64 x 45 mm (2.52 x 1.77 in.)
Sleeve internal diameter64.00 mm (2.5197 in)
Piston skirt outer diameter63.96 mm (2.518 in)
Piston pin outer diameter15.00 mm (0.5906 in)
Piston ring gap0.2 mm (0.008 in)
Ring side clearance0.01 mm (0.0004 in)
Crankshaft pin puter diameter25.980 mm (1.0228 in)
Cylinder Head
Warpage (max)0.2 mm (0.01 in)
Valve Arrangement:Side valve type
Stem outer diameter (standard):INTAKE6.970 mm (0.2744 in)
EXHAUST6.925 mm (0.2726 in)
Valve guide outer diameter7.000 mm (0.2756 in)
Cam height:17.03 mm (0.670 in)
Camshaft outer diameter:5.020 mm (0.1976 in)

Maintenance data

Cylinder compression5.3 kg/cm2 (75 psi)
Tappet clearance0.05-0.10 ± 0.02 (0.002-0.004 in)
Oil system
Oil typeHonda 4-stroke or an equivalent
Recommended oilSAE 10W-30
Oil capacity0.6 L (1.27 US gal, 1.06 lmp qt)
Ignition system
Ignition timing20° ± 3° B.T.D.C (Fixed)
Spark plugNGK: BR6HS, B6HS
Spark plug gap0.6-0.7 mm (0.024-0.028 in)

Tightening torque specs

Tightening torque specs
Carburetor (6 mm nut)8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Flywheel (14 mm nut)60-65 Nm; 6.0-6.5 kg·m; 43.4-47 ft·lb
Cylinder Head (8 x 35 mm flange bolt)20-28 Nm; 2.0-2.8 kg·m; 14.5-20.2 ft·lb
Connecting Rod (6 x 37 mm bolt)9-11 Nm; 0.9-1.1 kg·m; 6.5-8.0 ft·lb
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