The smell of freshly cut grass, the gentle hum of the engine, and the satisfying feeling of a well-manicured lawn – these are the joys of owning a gas lawn mower. But what happens when your trusty Craftsman mower refuses to start? Don’t worry! This comprehensive guide will walk you through the essential steps to get your Craftsman gas lawn mower roaring back to life. We’ll cover everything from basic troubleshooting to more advanced techniques, ensuring you can tackle any starting issue with confidence.
In essence, starting a Craftsman gas lawn mower involves a series of checks and actions, from ensuring fuel availability to verifying spark plug functionality. This article will break down these steps into a clear and concise guide, empowering you to troubleshoot and resolve common starting issues.
Step 1: The Basics – Fuel, Spark, and Air
Before delving into complex troubleshooting, let’s start with the fundamental requirements for a gas lawn mower to start: fuel, spark, and air.
1.1 Fuel Check: Is There Gas in the Tank?
This may seem obvious, but a surprisingly common issue is a lack of fuel. Make sure you have fresh, properly blended gasoline in the tank. Check the fuel level with the dipstick and ensure it’s above the “empty” mark.
1.2 Spark Check: Does the Engine Get a Spark?
To ensure a spark is present, you’ll need a spark plug tester.
Here’s how to check for a spark:
- Remove the spark plug. Locate the spark plug on the top of the engine, and use a spark plug wrench to remove it.
- Connect the spark plug tester. Attach the tester to the spark plug wire.
- Ground the tester. Hold the tester’s ground wire against the engine block.
- Crank the engine. With the spark plug tester connected, turn the engine over by pulling the starter rope or pressing the start button.
- Check for a spark. Look for a bright blue spark jumping across the tester’s gap.
If no spark is present:
- Replace the spark plug. A worn-out or fouled spark plug can prevent a spark.
- Check the spark plug wire. Ensure the wire is securely connected to the spark plug and the ignition coil.
- Inspect the ignition coil. The ignition coil is responsible for generating the spark. If you suspect a coil issue, consult your owner’s manual or a qualified mechanic.
1.3 Air Intake: Is Air Flowing into the Engine?
The air filter is responsible for filtering out debris that could damage the engine. If it’s clogged, the engine won’t get enough air to start.
Here’s how to check and clean the air filter:
- Locate the air filter. It’s usually located on the top or side of the engine, under a cover.
- Remove the cover and filter. Carefully remove the air filter cover and the filter itself.
- Clean or replace the filter. If the filter is simply dusty, you can clean it with compressed air or by tapping it against a hard surface. If it’s heavily soiled or torn, replace it with a new filter.
- Reinstall the filter and cover. Ensure the filter is properly seated in its housing before replacing the cover.
Step 2: Primer Bulb and Choke: Setting the Stage for Combustion
Many Craftsman gas lawn mowers come equipped with a primer bulb and a choke lever. These components aid in starting the engine by adjusting the fuel-air mixture.
2.1 Primer Bulb: Delivering Fuel to the Engine
The primer bulb pumps fuel into the carburetor, ensuring a rich fuel-air mixture for easy starting, especially when the engine is cold.
Here’s how to use the primer bulb:
- Locate the primer bulb. It’s usually a rubber bulb situated near the carburetor.
- Pump the bulb several times. Press the bulb firmly 5-10 times until it feels firm.
- Release the bulb. Allow the bulb to return to its original position.
2.2 Choke Lever: Controlling Air Flow
The choke lever restricts airflow to the engine, creating a richer fuel-air mixture, which is crucial for starting a cold engine.
Here’s how to use the choke lever:
- Locate the choke lever. It’s typically a lever on the side of the engine.
- Engage the choke. Move the choke lever to the “choke” position (usually a fully engaged position) before starting the engine.
- Disengage the choke gradually. Once the engine is running, gradually disengage the choke by moving the lever to the “run” position. This allows more air into the engine as it warms up.
Step 3: Starting the Engine: A Step-by-Step Guide
Now that you’ve checked the basics, it’s time to put your mower into action. Here’s a step-by-step guide to starting your Craftsman gas lawn mower:
- Ensure the mower is on a flat surface. This helps prevent accidental movement during starting.
- Engage the parking brake. This prevents the mower from rolling while starting.
- Set the choke. For a cold engine, engage the choke fully. For a warm engine, the choke can be disengaged or set to half-choke.
- Prime the engine. Pump the primer bulb several times, depending on the engine’s temperature.
- Pull the starter rope. Grasp the rope firmly and give it a strong, consistent pull. Don’t pull it all the way out; stop when you feel resistance.
- Repeat if necessary. If the engine doesn’t start on the first try, repeat steps 4 and 5. If the engine still doesn’t start, consider the troubleshooting steps below.
- Gradually disengage the choke. Once the engine starts, slowly move the choke lever to the “run” position to let more air into the engine as it warms up.
Step 4: Troubleshooting Common Starting Issues
If your Craftsman gas lawn mower still refuses to start, don’t despair. Let’s tackle some common starting issues:
4.1 Engine Won’t Turn Over: The Starting System
If the engine doesn’t turn over at all, the problem lies with the starting system. Here are some things to check:
- Battery (for electric start models). Ensure the battery is charged. Check the battery terminals for corrosion and tighten them if necessary.
- Starter rope (for pull-start models). Make sure the rope is not frayed or tangled. Check the recoil mechanism for any blockages or damage.
- Starter motor (for electric start models). The starter motor may be faulty. If you hear a clicking sound but the engine doesn’t turn, the starter motor may need to be replaced.
4.2 Engine Starts Briefly but Then Dies: Fuel Delivery
If the engine starts for a few seconds but then dies, the issue is likely with fuel delivery.
- Fuel lines. Inspect the fuel lines for kinks, cracks, or leaks.
- Fuel filter. A clogged fuel filter can restrict fuel flow. Replace the filter if necessary.
- Carburetor. The carburetor may be dirty or have a faulty float valve. Cleaning the carburetor or replacing it may be necessary. Refer to your owner’s manual or consult a qualified mechanic for specific instructions.
4.3 Engine Starts and Runs But Lacks Power: Air and Fuel Mixture
If the engine starts but runs poorly or lacks power, the problem might be with air intake or the fuel-air mixture.
- Air filter. A clogged air filter restricts airflow. Clean or replace the filter.
- Carburetor settings. The carburetor may require adjustment. Adjusting the idle screw or other carburetor settings can help fine-tune the fuel-air mixture. Consult your owner’s manual or seek assistance from a mechanic.
Step 5: When Professional Help is Needed
While this guide covers many common starting issues, sometimes the problem is more complex and requires professional expertise. If you’ve tried all of the above steps and your mower still won’t start, it’s time to contact a qualified repair shop or mechanic.
Here are some signs that you need professional help:
- Engine makes unusual noises. Rattling, grinding, or other unusual noises could indicate serious engine damage.
- You suspect a major component failure. If you suspect a problem with the ignition system, carburetor, or other major components, it’s best to seek professional help.
- You lack experience or comfort working on engines. If you’re unsure about certain repairs or lack the necessary tools, a mechanic can provide the expertise and safety you need.
Maintaining Your Craftsman Gas Lawn Mower: Prevention is Key
Regular maintenance is crucial for keeping your Craftsman gas lawn mower running smoothly and starting reliably. Here are some essential maintenance tasks:
- Change the oil regularly. Consult your owner’s manual for the recommended oil change interval.
- Clean the air filter. Clean or replace the air filter at the beginning of each mowing season or as needed.
- Inspect the spark plug. Replace the spark plug every season or as recommended in the owner’s manual.
- Check and adjust the fuel-air mixture. Proper carburetor settings are essential for optimal performance.
- Store the mower properly. During the off-season, store the mower in a dry, clean location. Drain the fuel tank, clean the mower, and change the oil before storage.
Conclusion: Get That Craftsman Mower Running!
Starting a Craftsman gas lawn mower can be a straightforward process with a little knowledge and patience. By following these steps, you can troubleshoot most starting issues and get your mower back in action. Remember to maintain your mower regularly to prevent problems and keep it running smoothly for years to come. With a little care and attention, you’ll be enjoying a well-manicured lawn in no time.
FAQ
How do I find the choke lever on my Craftsman lawnmower?
The choke lever is typically located on the top or side of the engine, near the air filter. It’s usually a small lever with a “choke” or “manual choke” label. When you pull the lever out, it restricts the flow of air to the engine, allowing it to run richer and easier to start.
What is the purpose of the primer bulb on my Craftsman mower?
The primer bulb, also known as the fuel pump, helps deliver fuel to the carburetor for easier starting. You’ll usually find it near the carburetor, sometimes with a red or black bulb. Squeeze the primer bulb several times to fill the carburetor with fuel before starting.
Why is my Craftsman mower not starting after following the instructions?
There could be a few reasons why your mower isn’t starting. First, make sure you’re using fresh, clean gasoline. Second, check if the spark plug is properly connected and not damaged. Third, ensure the air filter is clean and not clogged. Finally, if the engine is flooded, you may need to let it dry out for a few minutes before trying to start again.
How do I adjust the cutting height on my Craftsman mower?
Most Craftsman mowers have a lever or knob that allows you to adjust the cutting height. The lever is typically located near the wheels. To adjust the height, simply move the lever to the desired position, ensuring that all wheels are set to the same height.
What is the proper way to dispose of old gasoline from my Craftsman mower?
Never pour old gasoline down the drain or into the trash. Instead, take it to a local hazardous waste disposal facility. They can handle it safely and responsibly. You can also contact your local recycling center for more information on where to dispose of gasoline safely.
What type of oil should I use in my Craftsman lawnmower?
The recommended oil for your Craftsman lawnmower will be specified in the owner’s manual. It typically requires 4-stroke oil. Make sure to choose an oil that meets the specifications listed in your manual, as using the wrong oil can damage your engine.
What should I do if my Craftsman lawnmower starts but dies quickly?
If your mower starts but quickly dies, it could be due to a fuel problem, a spark plug issue, or an air intake blockage. Start by checking the fuel line for any kinks or obstructions. Then inspect the spark plug to ensure it’s clean and properly connected. Finally, check the air filter for any dirt or debris that might be restricting airflow.