Kohler EZT725 Service Manual

Pages 104

Year 2020

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Kohler EZT725 Engine Specification

The Kohler EZT725 engine is a robust, air-cooled, vertical shaft engine designed for optimal performance in residential and commercial-grade equipment such as lawn mowers and garden tractors. This engine features a displacement of 725cc, delivering a powerful output that meets the demanding needs of various outdoor power applications. Its efficient twin-cylinder design enhances operational smoothness and durability, providing consistent power under diverse conditions. The engine incorporates an overhead valve (OHV) configuration, which ensures improved fuel efficiency and superior power output. The full-pressure lubrication system with a spin-on oil filter increases engine longevity by maintaining cleaner oil and reducing wear on components.

Engine cooling is facilitated by a high-capacity fan and large fins that effectively dissipate heat, thereby maintaining optimal operating temperatures and prolonging engine life. The EZT725 comes equipped with a smart-choke technology enabling easy starts without user intervention, enhancing convenience and reliability. Additionally, it features a dual-element air filter that ensures clean air intake, thus improving performance and extending the service interval. The engine's construction includes high-quality materials like cast iron cylinder liners and an aluminum block, ensuring durability and reduced weight.

Moreover, Kohler's commitment to environmental responsibility is reflected in the EZT725's compliance with stringent emissions standards. This engine is engineered for quiet operation, integrating advanced muffler systems to minimize noise. With its compact design, the EZT725 is versatile and can be easily integrated into various equipment configurations, making it a preferred choice for many OEMs. The Kohler EZT725 engine represents a blend of performance, reliability, and efficiency, backed by comprehensive support and parts availability from Kohler's extensive service network.

Kohler EZT725 Engine F.A.Q.

What is the recommended oil type for the Kohler EZT725 engine?

The recommended oil type for the Kohler EZT725 engine is SAE 10W-30. It is important to use a high-quality detergent oil classified as "For Service SF, SG, SH, SJ" or higher.

How often should I change the oil in the Kohler EZT725 engine?

The oil in the Kohler EZT725 engine should be changed every 100 operating hours or annually, whichever comes first. More frequent changes are recommended under heavy use or dusty conditions.

What is the proper spark plug gap for the Kohler EZT725 engine?

The proper spark plug gap for the Kohler EZT725 engine is 0.030 inches (0.76 mm). It's crucial to ensure the spark plugs are correctly gapped for optimal engine performance.

How do I troubleshoot a Kohler EZT725 engine that won't start?

To troubleshoot a non-starting Kohler EZT725 engine, check the fuel level, ensure the spark plug is in good condition and properly gapped, verify that the air filter is clean, and inspect the ignition system for any faults.

What maintenance is required for the air filter on the Kohler EZT725 engine?

The air filter should be checked before each use and cleaned or replaced every 100 operating hours or annually. In dusty conditions, more frequent maintenance may be necessary to prevent engine damage.

How do I adjust the idle speed on the Kohler EZT725 engine?

To adjust the idle speed, locate the idle speed screw on the carburetor and turn it clockwise to increase the idle speed or counterclockwise to decrease it. Idle speed should be set according to the specifications in the engine manual.

What is the procedure to clean the carburetor on a Kohler EZT725 engine?

To clean the carburetor, remove it from the engine, disassemble it carefully, and use a carburetor cleaner to remove any deposits. Reassemble the carburetor and reinstall it, ensuring all connections are secure.

How do I winterize the Kohler EZT725 engine?

To winterize the engine, drain the fuel system, change the oil, clean or replace the air filter, and remove the spark plug to add a few drops of oil into the cylinder. Replace the spark plug and store the engine in a dry, cool location.

What should I do if the Kohler EZT725 engine overheats?

If the engine overheats, check for proper ventilation around the engine, ensure the cooling fins are clean, and verify the oil level is correct. Stop the engine and allow it to cool down before troubleshooting further.

How can I improve the fuel efficiency of the Kohler EZT725 engine?

To improve fuel efficiency, ensure regular maintenance such as changing the oil, cleaning the air filter, and keeping the spark plug in good condition. Operating the engine at a consistent speed and avoiding excessive idling can also help.