Exmark 708cc Engine Problems: A Comprehensive Guide to Troubleshooting and Maintenance


Picture this: It’s a bright Saturday morning, and you’re ready to tackle your overgrown lawn. You grab your trusty Exmark mower, only to find it struggling with one of those pesky 708cc engine problems. You scratch your head, wondering what’s going on with your mower. Well, don’t worry! In this article, we’ll dive into some common Exmark 708cc engine problems and how to fix them. So, buckle up, grab a cup of coffee, and let’s get to it!

Problem 1: Engine Won’t Start

One fine day, your neighbor Jim came up to you, complaining that his Exmark 708cc engine wouldn’t start. He was frustrated because he had a lawn full of tall grass and no way to mow it. This issue is quite common, and there are a few potential culprits:

Fuel System Issues

First, check if there’s enough fresh gasoline in the tank. Sometimes, the simplest solution is the right one! If the fuel is old, it could lead to a clogged carburetor or fuel line. In this case, drain the old fuel and clean the carburetor, ensuring that all parts are free from debris.

Spark Plug Problems

If the fuel system is all good, inspect the spark plug. A worn or fouled spark plug could be the reason your engine won’t start. Clean the spark plug or replace it if necessary.

Air Filter Issues

A dirty air filter could also cause your Exmark 708cc engine to have trouble starting. Clean or replace the air filter, and see if that solves the problem.

Problem 2: Engine Stalls or Surges

Your buddy Sarah was mowing her lawn when suddenly her Exmark 708cc engine began to stall and surge. It’s a nightmare scenario that no one wants to experience. Here’s what you can suggest to Sarah:

Carburetor Adjustment

In most cases, the culprit behind a surging engine is an improperly adjusted carburetor. Adjust the carburetor following your engine manual’s guidelines, and you should notice a significant improvement.

Fuel Quality and Filter

Low-quality fuel or a clogged fuel filter can also cause the engine to stall or surge. Drain any old fuel, clean the fuel filter, and refill the tank with fresh gasoline.

Problem 3: Overheating Engine

Last summer, your cousin Mike called you, worried that his Exmark 708cc engine was overheating. He was right to be concerned, as an overheating engine can lead to more severe problems. Here’s how to help him out:

Clean the Cooling Fins

Over time, dirt and debris can accumulate on the engine’s cooling fins, causing the engine to overheat. Make sure to clean the cooling fins regularly to avoid this issue.

Check the Oil Level

Low engine oil levels can also cause overheating. Regularly check and maintain the oil level according to the manufacturer’s guidelines to prevent this problem.

Problem 4: Engine Knocks or Pings

Your coworker, Alice, mentioned that her Exmark 708cc engine had been making knocking or pinging noises while mowing. This is definitely not music to anyone’s ears! Here are some potential solutions:

Check the Spark Plug

A loose or improperly gapped spark plug can cause the engine to knock or ping. Ensure the spark plug is tightened and gapped correctly to resolve the issue.

Octane Level

Using gasoline with a lower octane level than recommended can cause knocking or pinging. Make sure to use the appropriate fuel for your engine.


Exmark 708cc engine problems can be frustrating and may seem daunting, but with the right knowledge and a little patience, you can diagnose and fix these issues yourself. By understanding the common problems that could occur with your Exmark 708cc engine, you’ll be better prepared to tackle them head-on and keep your mower running smoothly.

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Frequently Asked Questions (FAQ)

How often should I change the oil in my Exmark 708cc engine?

The frequency of oil changes may vary depending on usage and the specific model. However, a general rule of thumb is to change the oil after the first 5 hours of use and then every 50 hours or annually, whichever comes first. Always refer to your engine manual for the manufacturer’s recommendations.

What type of gasoline should I use for my Exmark 708cc engine?

It’s best to use fresh, high-quality gasoline with an octane rating of 87 or higher. Avoid using gasoline that contains more than 10% ethanol, as it could cause issues with your engine.

How can I prevent my Exmark 708cc engine from overheating?

To prevent overheating, make sure to regularly clean the cooling fins on your engine, maintain proper oil levels, and ensure the air filter is clean. These steps will help keep your engine cool and running efficiently.

Can I use a power washer to clean my Exmark 708cc engine?

While it may be tempting to use a power washer to clean your engine, it’s not recommended. High-pressure water can damage engine components and force water into areas where it shouldn’t be. Instead, use a brush or compressed air to clean the engine’s exterior.

How do I know when it’s time to replace the spark plug on my Exmark 708cc engine?

A spark plug typically lasts for about 100 hours of use or one mowing season. However, signs of a worn spark plug include trouble starting the engine, poor engine performance, and increased fuel consumption. Inspect the spark plug regularly and replace it when necessary.

Bonus Tips: Preventative Maintenance

To keep your Exmark 708cc engine in tip-top shape and avoid most of these problems, follow these simple preventative maintenance tips:

  • Regularly inspect and change the engine oil: Changing the oil at recommended intervals is crucial for the longevity of your engine. Make sure to follow the manufacturer’s guidelines for oil type and change intervals.
  • Clean or replace the air filter: A clean air filter ensures that your engine gets the right amount of air for efficient combustion. Replace or clean the air filter as needed.
  • Check and maintain the fuel system: Using fresh, high-quality gasoline and keeping the fuel system clean will help avoid many engine issues. Regularly inspect and clean the fuel filter, carburetor, and fuel lines.
  • Inspect and adjust the spark plug: Ensuring your spark plug is in good condition and correctly gapped can prevent many engine problems. Replace the spark plug as needed and follow the manufacturer’s guidelines for proper gapping.
  • Keep the cooling system clean: Regularly inspect and clean the cooling fins to avoid overheating issues.

By following these simple maintenance tips, you’ll be on your way to a long-lasting, problem-free Exmark 708cc engine. Happy mowing!

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