How to Start a Craftsman 625 Series Lawn Mower?

The warm weather is here, and you’re eager to get your lawn looking its best. But when you pull the cord on your Craftsman 625 series lawn mower, nothing happens. You’re left staring at the unyielding machine, wondering where you went wrong. Don’t despair! Starting a Craftsman 625 series lawn mower can seem daunting, but with the right steps, it’s a simple process. This comprehensive guide will walk you through everything you need to know, from basic preparation to troubleshooting common problems. By the end, you’ll be confidently mowing your lawn with ease.

Starting a Craftsman 625 Series Lawn Mower: A Step-by-Step Guide

Starting a Craftsman 625 series lawn mower is a straightforward process. It involves a few simple steps that ensure the engine is prepared to run smoothly. Here’s a detailed walkthrough:

1. Prepare the Mower

Before attempting to start your Craftsman 625 series lawn mower, ensure it is ready. This involves a few essential steps:

a) Check the Fuel Level

Your Craftsman 625 series lawn mower relies on gasoline for power. Ensure the fuel tank is sufficiently filled with fresh gasoline. Old gasoline can gum up the engine and cause starting problems.

b) Check the Oil Level

The engine needs oil to lubricate moving parts. Check the oil level using the dipstick, which is usually located on the side of the engine. Add oil if necessary, making sure to use the correct type of oil specified in your owner’s manual.

c) Inspect the Spark Plug

A healthy spark plug is crucial for ignition. Inspect the spark plug for wear and tear. If it looks corroded or damaged, replace it with a new one.

2. Start the Mower

Once your Craftsman 625 series lawn mower is prepared, you can start it:

a) Choke the Engine

The choke helps enrich the fuel-air mixture, making it easier to start a cold engine. Engage the choke lever, usually located on the handle.

b) Prime the Engine

Some Craftsman 625 series lawn mowers have a primer bulb. Press this bulb a few times to fill the carburetor with fuel.

c) Pull the Starter Cord

With the choke engaged and the engine primed, gently pull the starter cord. Don’t pull it all the way out; instead, pull it with a firm, steady motion. Repeat this process until the engine starts.

d) Disengage the Choke

Once the engine is running, disengage the choke lever. The engine should continue running smoothly.

3. Troubleshooting Common Starting Issues

Even after taking these steps, you might encounter difficulties starting your Craftsman 625 series lawn mower. Here are some common problems and solutions:

a) Engine Doesn’t Start at All
  • Dead Battery: If the mower has an electric starter, check the battery. A dead battery won’t provide the necessary power to start the engine. Replace the battery if needed.
  • Fuel Problems: Ensure the fuel is fresh and the fuel line isn’t clogged. Clean or replace the fuel filter as necessary.
  • Spark Plug Issue: The spark plug might be fouled, worn out, or have a loose connection. Inspect and replace or clean the spark plug as needed.
b) Engine Starts but Dies Immediately
  • Choke Engaged: If the choke is still engaged, the engine will receive too much fuel and stall. Disengage the choke.
  • Fuel Shortage: The fuel tank may be empty or the fuel line might be blocked. Check the fuel level and clear any blockages in the fuel line.
  • Air Filter Problem: A dirty or clogged air filter restricts air intake, leading to poor combustion. Replace or clean the air filter.
c) Engine Starts but Runs Roughly
  • Engine Flooding: The engine might be flooded with too much fuel. Allow the engine to cool down and try starting it again with the choke disengaged.
  • Carburetor Problems: A dirty carburetor can cause starting and running problems. Clean or rebuild the carburetor if necessary.

4. Maintaining Your Craftsman 625 Series Lawn Mower

Regular maintenance is crucial for keeping your Craftsman 625 series lawn mower running smoothly. Here are a few important maintenance tasks:

a) Change the Oil Regularly

Change the oil every 25 hours of operation or as recommended by the manufacturer. This removes contaminants and ensures proper lubrication.

b) Clean the Air Filter

A clean air filter ensures efficient engine operation. Inspect and clean or replace the air filter regularly, especially after mowing in dusty or grassy conditions.

c) Sharpen the Blade

A sharp blade cuts cleanly and prevents scalping. Sharpen the blade after every 10-15 hours of use or when it appears dull.

d) Store Properly

Proper storage is vital for extending the lifespan of your Craftsman 625 series lawn mower. Drain the fuel tank, clean the mower, and store it in a dry place. Consider using a lawn mower cover to protect it from the elements.

5. Where to Get Help

If you’re still having trouble starting your Craftsman 625 series lawn mower, you can seek assistance from various sources:

a) Owner’s Manual: The owner’s manual contains detailed information about your specific mower model, including troubleshooting tips and maintenance instructions.
b) Craftsman Customer Support: Craftsman offers customer support through their website and phone lines. You can reach out to them for help with troubleshooting or finding parts.
c) Local Repair Shops: Many local repair shops specialize in lawn mower maintenance and repair. They can diagnose problems and provide professional solutions.


Starting your Craftsman 625 series lawn mower can be a straightforward process with the right knowledge and steps. From preparing the mower to troubleshooting common problems, this guide has equipped you with the information you need for successful starts. Remember, regular maintenance and proper storage contribute significantly to the lifespan and performance of your lawn mower. By taking care of your machine, you’ll enjoy years of reliable lawn care with your Craftsman 625 series lawn mower.


How do I check the oil level in my Craftsman 625 Series lawn mower?

To check the oil level, locate the dipstick on the engine. Pull it out and wipe it clean with a rag. Reinsert the dipstick fully and then pull it out again. The oil level should be between the “Full” and “Add” markings on the dipstick. If it’s low, add oil slowly until it reaches the “Full” mark. Use the recommended type of oil for your engine, which should be specified in your owner’s manual.

Why won’t my Craftsman 625 Series lawn mower start?

There are a few common reasons why your Craftsman 625 Series lawn mower might not start. First, make sure the fuel tank is full and the fuel valve is open. Next, check the spark plug for damage or corrosion, and replace it if needed. Finally, verify that the air filter is clean. If the air filter is clogged, it can restrict airflow and prevent the engine from starting.

What type of gas should I use in my Craftsman 625 Series lawn mower?

It is important to use gasoline that is specifically designed for small engines. This type of gasoline usually has a higher octane rating and is blended with additives that help to prevent engine damage. Do not use gasoline with ethanol, as this can cause problems with the fuel system and can damage the engine.

How do I change the spark plug on my Craftsman 625 Series lawn mower?

To change the spark plug, locate it on the top of the engine. Using a wrench, loosen the spark plug and remove it. Inspect the spark plug for signs of wear or damage. Replace the spark plug with a new one of the same type and thread it back into the engine. Tighten the spark plug using the wrench, but do not overtighten.

How do I adjust the cutting height on my Craftsman 625 Series lawn mower?

The cutting height on most Craftsman 625 Series lawn mowers is adjusted by using a lever located on the side of the deck. To raise or lower the deck, simply move the lever to the desired height setting. Consult your owner’s manual for specific instructions on adjusting the cutting height on your model.

How often should I change the oil in my Craftsman 625 Series lawn mower?

You should change the oil in your Craftsman 625 Series lawn mower every 25 hours of operation or once a season, whichever comes first. This helps to prevent engine wear and tear and ensures that the engine runs smoothly.

What should I do if my Craftsman 625 Series lawn mower won’t cut properly?

If your Craftsman 625 Series lawn mower isn’t cutting properly, first check the blades for sharpness. Dull blades can result in uneven cuts. If the blades are dull, sharpen them or replace them with new ones. You should also check to make sure the blades are installed correctly and securely. Finally, make sure the deck height is set to the desired level.

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