Subaru-Robin EC08B

Subaru-Robin EC08BThe Subaru-Robin EC08B is a 78.5 cc (4.82 cu·in) natural aspirated single-cylinder two-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft and 1:2.5 speed reduction system.

The Subaru-Robin EC08B engine has a single-cylinder, float type carburetor, flywheel magneto type ignition system (contactless magneto type ignition available as an option), and recoil starter. The engine is fitted with a semi-wet type air cleaner. The EC08B is equipped with a 1.5 L (0.4 US. gal. 0.33 Imp. gal.) fuel tank.

Cylinder bore and piston stroke are 50.0 mm (1.97 in) and 40.0 mm (1.57 in), respectively. The Subaru-Robin EC08B engine produced 3.3 PS (2.4 kW; 3.2 HP) at 2,200 rpm of maximum output power and 12.5 N·m (1.3 kg·m, 9.2 ft·lb) at 1,440 rpm of peak torque.

General information

Engine Specifications
Engine modelEC08B
Engine type2-stroke, Piston Valve Type, single-cylinder
Displacement78.5 cm3, (4.82 cu·in)
Max. horsepower3.3 PS (2.4 kW; 3.2 HP) at 2,200 rpm
Max. torque12.5 N·m (1.3 kg·m, 9.2 ft·lb) at 1,440 rpm
Cooling systemForced air
Air cleanerSemi-wet type
Lubricating systemFuel-lubricant Mixture Type
Ignition systemFlywheel Magneto Type (Contactless Magneto Type available as option)
Fuel systemFloat type carburetor
Fuel consumption380 g/HPh
Fuel tank capacity1.5 L (0.4 US. gal. 0.33 Imp. gal.)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil starter
GovernorCentrifugal flyweight type
PTO shaft rotationCounterclockwise (from PTO shaft side)
Speed Reduction System1:2.5 reduction gear
Dimensions (L x W X H)285 x 307 x 287 mm (11.2 x 12.1 x 11.3 in)
Dry weight8.8 kg (19.4 lbs)

Service Data

Oil system
Lubrication system:Fuel-lubricant Mixture Type
Recommended oil:2-Cycle Engine Oil
Oil capacityGasoline-lubricant mixture: 25:1
Fuel system
Type:Float type carburetor
Ignition system
Type:Flywheel Magneto Type (Contactless Magneto Type available as option)
Spark plug:NGK: B7HS
Spark plug torque:27.5 N·m (2.8 kg·m, 20.3 ft·lb)
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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