Subaru-Robin EC08D

Subaru-Robin EC08DThe Subaru-Robin EC08D is a 78.5 cc (4.82 cu·in) single-cylinder air-cooled 2-stroke internal combustion general-purpose gasoline engine with horizontal PTO shaft.

The Subaru-Robin EC08D engine has a lined aluminum cylinder, float type carburetor, T.C.I. ignition system (Transistor Circuit Ignition) and recoil starter.

Cylinder bore is 50.0 mm (1.97 in) and piston stroke is 40.0 mm (1.57 in). The EC08D engine produced 3.3 PS (2.4 kW; 3.2 HP) at 5,500 rpm of maximum horsepower and 2.2 PS (1.6 kW; 2.2 HP) at 4,500 rpm of continuous power. Maximum torque is 5.0 N·m (0.51 kg·m, 3.7 ft·lb) at 3,600 rpm.

General information

Engine Specifications
Model EC08D
Type 2-stroke, single cylinder
Displacement 78.5 cm 3 (4.82 cu-in)
Max. horsepower 3.3 PS (2.4 kW; 3.2 HP) at 5,500 rpm
Max. torque (crank PTO) 5.0 N·m (0.51 kg·m, 3.7 ft·lb) at 3,600 rpm
Carburetor Float type
Cooling system Forced-air
Ignition system Transistor Circuit Ignition
Lubricating system Mechanical splashing
Starting system Recoil
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 1.5 L
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

Subaru-Robin EC08D
Length, mm (in) 256 (10.1)
Width, mm (in) 307 (12.1)
Height, mm (in) 287 (11.3)
Dry weight, kg (lb) 7.8 (17.2)

Service Information

Oil system
Oil type 2-stroke or an equivalent
Recommended oil
Oil capacity Gasoline-lubricant mixture: 20-25:1
Ignition system
Spark plug NGK: B7HS
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
Spark plug tightening torque 27.5 N·m (2.8 kg·m, 20.3 ft·lb)
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  1. Your specs say the fuel type is “unleaded gasoline”.
    Your specs also say that the engine is “2-stroke”.
    If it is a 2-stroke, then the fuel should be a gas-oil mix, not just unleaded gasoline. What is the gas-oil mixture ratio ?

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