The 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) |
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 ?
In the section “Oil system”: “Gasoline-lubricant mixture: 20-25:1”