Subaru EY20-3 Parts Manual

Pages 26

Year 2002

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Subaru EY20-3 Engine Specification

The Subaru EY20-3 engine is a robust air-cooled, four-stroke, single-cylinder gasoline engine known for its durability and reliable performance. It has a displacement of 183 cubic centimeters, delivering a maximum output of approximately 5.5 horsepower at 4000 RPM. This engine is designed to provide efficient power with a horizontal shaft that enhances versatility for various applications, including generators, pumps, and other industrial machinery.

The EY20-3 features an overhead valve (OHV) configuration, which contributes to its enhanced fuel efficiency and reduced emissions. The bore and stroke measure 67 mm by 52 mm, respectively, optimizing the engine's balance between power and efficiency. It operates on a splash lubrication system, ensuring the engine components are adequately lubricated during operation, thus extending the engine's lifespan.

Its fuel system is equipped with a float-type carburetor that ensures consistent fuel delivery, contributing to smooth engine operation. The ignition is managed by a transistorized magneto, providing reliable spark generation and facilitating easy starting. The engine's cooling system uses forced air, maintaining optimal operating temperatures even under demanding conditions.

The Subaru EY20-3 is compact and lightweight, weighing approximately 15 kilograms, which allows for easy integration into various equipment setups. Its design emphasizes ease of maintenance, with accessible components and a straightforward layout. The engine is characterized by low vibration and noise levels, enhancing user comfort and operational efficiency. With a reputation for reliability, the Subaru EY20-3 engine is a preferred choice for applications requiring consistent performance and longevity in challenging environments.

Subaru EY20-3 Engine F.A.Q.

What is the recommended oil type for the Subaru EY20-3 engine?

The recommended oil type for the Subaru EY20-3 engine is SAE 10W-30 for general use. In extreme temperatures, you might opt for SAE 5W-30 or SAE 30.

How often should I change the oil in my Subaru EY20-3 engine?

It is advisable to change the oil every 100 hours of operation or annually, whichever comes first. Regular oil changes help maintain engine performance and longevity.

What is the correct spark plug gap for the Subaru EY20-3 engine?

The correct spark plug gap for the Subaru EY20-3 engine is 0.028-0.031 inches (0.7-0.8 mm). Ensure the gap is set correctly to avoid ignition issues.

How can I troubleshoot starting issues with the Subaru EY20-3 engine?

To troubleshoot starting issues, check the fuel supply, ensure the spark plug is clean and correctly gapped, inspect the air filter for blockages, and verify that the ignition coil is functioning.

What maintenance steps should I follow to keep my Subaru EY20-3 engine in good condition?

Regular maintenance includes checking and changing the oil, cleaning or replacing the air filter, inspecting the spark plug, and ensuring the fuel system is clean. Regularly inspect belts and replace them if worn.

What is the recommended way to store the Subaru EY20-3 engine when not in use for extended periods?

For long-term storage, drain the fuel, change the oil, clean the engine exterior, remove the spark plug and pour a small amount of oil into the cylinder, then pull the starter rope to distribute the oil. Store in a dry place.

How can I improve the fuel efficiency of my Subaru EY20-3 engine?

To improve fuel efficiency, ensure the air filter is clean, the spark plug is in good condition, and the engine is regularly serviced. Avoid overloading the engine and operate it at optimal speed settings.

What are common signs of a failing carburetor in the Subaru EY20-3 engine?

Common signs include difficulty starting, poor engine performance, black smoke from the exhaust, and increased fuel consumption. Cleaning or rebuilding the carburetor may resolve these issues.

How do I clean the air filter on my Subaru EY20-3 engine?

Remove the air filter cover, take out the filter, and clean it with compressed air or wash it in soapy water if it's a foam filter. Allow it to dry completely before reinstalling.

What should I do if my Subaru EY20-3 engine overheats during operation?

If the engine overheats, stop the engine immediately, let it cool down, and check for any blockages in the cooling fins. Ensure the oil level is adequate and the air intake is not obstructed.