The Subaru-Robin EA190V is a 189 cc (11.53 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with vertical shaft manufactured by Industrial Products division of Subaru Corporation under the Subaru Industrial Power Products brand name (other names: Robin, Subaru-Robin and Wisconsin Robin).
The Subaru-Robin EA190V engine has an OHC (overhead camshaft) system with chain drive for optimized engine size and durability; hemispherical head with angled intake/exhaust valves; cast-iron cylinder line; float type carburetor; capacitance discharge type ignition system.
The cylinder bore is 68.0 mm (2.67 in) and the piston stroke is 52.0 mm (2.05 in), compression ratio rating is 9.0:1. The engine produced 5.5 HP (4.1 kW) at 3,600 rpm of maximum horsepower. Maximum torque is 11.2 N·m (1.1 kg·m, 8.3 ft·lb) at 2,500 rpm.
General information
| Engine Specifications | |
| Model | EA190V |
| Type | 4-stroke, OHC, single cylinder |
| Displacement | 189 cm 3 (11.53 cu-in) |
| Max. horsepower | 5.5 HP (4.1 kW) at 3,600 rpm |
| Max. torque (crank PTO) | 11.2 N·m (1.1 kg·m, 8.3 ft·lb) at 2,400 rpm |
| Carburetor | Float type |
| Cooling system | Forced-air |
| Ignition system | Сapacitance discharge type |
| Lubricating system | Mechanical splashing |
| Starting system | Recoil |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.2 L |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| EA190V | |
| Length, mm (in) | 425 (16.7) |
| Width, mm (in) | 360 (14.2) |
| Height, mm (in) | 290 (11.4) |
| Dry weight, kg (lb) | 14.0 (30.9) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 9.0:1 | |
| Bore x Stroke | 68.0 mm X 52.0 mm (2.68 x 2.05 in) | |
| Sleeve internal diameter | 68.000-68.020 mm (2.6772-2.6779 in) | |
| Piston skirt outer diameter | 67.989-67.971 mm (2.6767-2.676 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top/second | 0.04-0.08 mm (0.0016-0.0031 in) |
| Ring end gap | Top | 0.13-0.28 mm (0.0051-0.011 in) |
| Second | 0.20-0.40 mm (0.0079-0.0157 in) | |
| Ring width | Top | 2.50-2.70 mm (0.0984-0.1063 in) |
| Second | 2.60-2.80 mm (0.1024-0.1102 in) | |
| Connecting rod small end ID | 16.005-16.021 mm (0.6301-0.6307 in) | |
| Connecting rod big end ID | 30.000-30.018 mm (1.1811-1.1818 in) | |
| Crankpin outer diameter | 29.969-29.981 mm (1.1799-1.1804 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHC | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 5.440-5.455 mm (0.2142-0.2148 in) |
| EXHAUST | 5.430-5.445 mm (0.2142-0.2148 in) | |
| Spring free length | 30.50 mm (1.2008 in) | |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod bolt | 13 Nm; 1.3 kg·m; 9.0 ft·lb |
| Cylinder head cover bolt | 28 Nm; 2.86 kg·m; 20.66 ft·lb |
| Crankcase cover bolt | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Flywheel nut | 64 Nm; 6.53 kg·m; 47.23 ft·lb |
| Value locking nut | 8 Nm; 0.82 kg·m; 5.9 ft·lb |
Service Information
| Valve clearance | |
| Intake valve | 0.10-0.15 mm (0.0039-0.0059 in) |
| Exhaust valve | 0.15-0.20 mm (0.0059-0.0079 in) |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30, 10W-40 |
| Oil capacity | 0.6 L (0.63 US. qt) |
| Ignition system | |
| Spark plug |
NGK: BPR7HS CHAMPION: RL87YC TORCH: E6RTC |
| Spark plug gap | 0.6-0.7 mm (0.0236-0.0236 in) |
| Spark plug tightening torque | 20 N·m (2.0 kg·m, 14 ft·lb) |
Author:
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