Honda GS65

Honda GS65 engineThe Honda GS65 is a 240 cc single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1975 for general-purpose applications.

The Honda GS65 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. It has an electric starter motor, horizontal carburetor with butterfly valve and high voltage ignition.

The GS65 produced 6.8 PS (5.0 kW) at 4000 rpm of maximum output and 12.2 Nm (1.24 kg·m) at 3000 rpm. The dry weight of the Honda GS65 engine was 30.0 kg (66.0 lbs). A 72 mm (2.8 in) cylinder bore and 59 mm (2.3 in) piston stroke give the engine a total of 240 cc (14.6 of displacement. The compression ratio is 6.1:1.

General information

Engine Specifications
Model GS65
Type 4-stroke, side valve type (L-head), single cylinder
Displacement 240 cm 3 (14.6 cu-in)
Max. horsepower 6.8 HP (5.0 kW) at 4000 rpm
Max. torque 12.0 Nm (1.24 kg·m) at 3000 rpm
Carburetor Horizontal, butterfly valve
Cooling system Forced-air
Ignition system High voltage ignition
Lubricating system Splash system
Starting system Electirc starter motor
Stoping system Ground switch
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 6.9 L (1.6 US gal., 1.5 Imp. gal.)
Fuel consumption 300 g/HPh (0.67 lb/HPh)
PTO shaft rotation Counterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio: 6.1:1
Bore x Stroke 72 X 59 mm (2.8 x 2.3 in)
Sleeve internal diameter 72.00 mm (2.835 in)
Piston skirt outer diameter 71.97 mm (2.833 in)
Ring width Top 2.48 mm (0.098 in)
Second/Oil 2.49 mm (0.098 in)
Ring Side Clearance Top 0.02 mm (0.0008 in)
Second/Oil 0.01 mm (0.0004 in)
Piston pin outer diameter 19.0 mm (0.748 in)
Cylinder Head
Warpage (max) 0.2 mm (0.01 in)
Valve Arrangement: OHV
Valves: 2
Stem outer diameter (standard): INTAKE 6.97 mm (0.274 in)
EXHAUST 6.93 mm (0.273 in)
Valve guide internal diameter 7.00 mm (0.276 in)
Cam height: INTAKE 35.18 mm (1.385 in)
EXHAUST 35.18 mm (1.385 in)

Tightening torque specs

Tightening torque specs
Fuel tank (8 mm nut, bolt) 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.2 ft·lb
Side cover (8 mm bolt) 20-25 Nm; 2.0-2.5 kg·m; 14.5-18.1 ft·lb
Cylinder Head (8 mm bolt) 20-25 Nm; 2.0-2.5 kg·m; 14.5-18.1 ft·lb
Cylinder (6 mm bolt) 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Cylinder (8 mm bolt) 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.2 ft·lb
Camshaft center (6 mm bolt) 10-15 Nm; 1.0-1.5 kg·m; 7.2-10.8 ft·lb
Starter pulley (6 mm bolt) 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Flywheel (17 mm nut) 70-80 Nm; 7.0-8.0 kg·m; 50.6-57.9 ft·lb
Muffler (6 mm nut) 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Carburetor (6 mm nut) 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb

Maintenance data

Cylinder compression 4.0 kg/cm2 at 450-600 rpm
Tappet clearance
Intake valve 0.06-0.11 mm (0.0023-0.0043)
Exhaust valve 0.06-0.11 mm (0.0023-0.0043)
Oil system
Oil type Honda 4-stroke or an equivalent (SG, SF)
Recommended oil SAE 10W-30, 10W-40
Oil capacity 0.82 L (1.7 US pt., 1.4 Imp. pt.)
Ignition system
Ignition timing 25 ° B.T.D.C (Fixed)
Spark plug NGK: BR6HS, B6HS
Spark plug gap 0.6-0.7 mm (0.024-0.028 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.

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