Subaru EH12-2 Parts Manual

Subaru EH12-2 Engine manual cover
Pages 24
Year 1999
Language(s)
English en

Subaru EH12-2 Engine Specification

The Subaru EH12-2 engine is a compact, air-cooled, four-stroke overhead camshaft (OHC) gasoline engine designed for reliability and efficiency in various small machinery applications. It features a single-cylinder configuration with a bore and stroke of 60 mm x 42 mm, resulting in a displacement of 126 cc. The engine delivers a maximum output of approximately 4.0 horsepower at 4000 RPM, making it suitable for light-duty tasks. Its design incorporates an efficient combustion system, which optimizes fuel consumption and reduces emissions, complying with modern environmental standards.

The EH12-2 engine includes a splash lubrication system that ensures consistent oil distribution across moving parts, enhancing durability and decreasing maintenance needs. The engine's cooling is facilitated by a forced air system that maintains optimal operating temperatures even under demanding conditions. It is equipped with a recoil start mechanism, offering reliable and easy starting. Additionally, the engine's lightweight and compact design simplifies integration into various equipment, while its robust construction provides longevity and resilience against wear.

With a fuel tank capacity of approximately 2.5 liters, the engine ensures extended operation before refueling. It supports unleaded gasoline, aligning with widespread fuel availability. Designed with user convenience in mind, the EH12-2 features accessible maintenance points, allowing for straightforward servicing and adjustments. Its adaptability makes it ideal for use in generators, pumps, and other portable equipment where dependable power is essential. Overall, the Subaru EH12-2 engine embodies a balance of performance, efficiency, and durability, making it a preferred choice for small engine applications.

Subaru EH12-2 Engine F.A.Q.

What is the recommended oil type for a Subaru EH12-2 engine?

The recommended oil type for a Subaru EH12-2 engine is SAE 10W-30 for general use. In colder climates, SAE 5W-30 can be used for better performance.

How often should the air filter be replaced on a Subaru EH12-2 engine?

The air filter should be checked every 50 hours of operation and replaced if necessary. Under dusty conditions, it may need cleaning or replacement more frequently.

What is the correct spark plug gap for a Subaru EH12-2 engine?

The correct spark plug gap for a Subaru EH12-2 engine is 0.6-0.7 mm (0.024-0.028 inches).

How can I troubleshoot a Subaru EH12-2 engine that won't start?

Check the fuel level, ensure the spark plug is clean and properly gapped, verify that the air filter is not clogged, and ensure the ignition switch is in the correct position.

What is the procedure for adjusting the carburetor on a Subaru EH12-2 engine?

Start by turning the main mixture screw clockwise until lightly seated, then back out 1.5 turns. Adjust the idle mixture screw similarly. Fine-tune while the engine is running to achieve optimal performance.

How do I perform a compression test on a Subaru EH12-2 engine?

Remove the spark plug and insert a compression gauge. Pull the starter rope several times to get a reading. A healthy engine should show a compression of around 120 psi.

What maintenance should be performed regularly on a Subaru EH12-2 engine?

Regular maintenance includes checking and changing the oil, inspecting and cleaning the air filter, checking the spark plug, and ensuring all bolts and screws are tight.

How can I resolve excessive vibration in a Subaru EH12-2 engine?

Check for loose mounting bolts, inspect the engine for damaged components, and ensure the crankshaft is not bent. Balancing rotating parts may also help reduce vibration.

What should I do if the Subaru EH12-2 engine is overheating?

Ensure the cooling fins are clean, check the oil level, and verify the engine is not operating under excessive load. Make sure the airflow around the engine is not obstructed.

How do I winterize a Subaru EH12-2 engine?

To winterize, drain the fuel tank and carburetor, change the oil, remove the spark plug and add a tablespoon of oil into the cylinder, then pull the recoil starter to distribute the oil. Store the engine in a dry place.