To get your lawn mower up and running after sitting idle, start by checking the essential components and performing some basic maintenance. Ensure the spark plug is clean, the fuel is fresh, and the oil levels are adequate. If your mower still won’t start, try starting it with a gentle tug or push, making sure safety features are disengaged.
If your mower has been sitting for a while, the key is to troubleshoot and refresh its vital parts—clean or replace the spark plug, add fresh fuel, and check the oil. After that, prime the carburetor and pull the starter cord firmly. With a little patience, your mower will be humming smoothly again.
If your lawn mower has been sitting unused, it can be tricky to start it up again. Dirt, stale fuel, and dried-out parts can cause issues. However, with some simple steps—such as inspecting the spark plug, replacing old fuel, and ensuring the oil is proper—you can revive your mower quickly. Starting it might require a few pulls, but once it catches, you’ll be back to mowing in no time. Regular maintenance after sitting long periods extends the life of your mower and keeps it ready whenever you need it.
How to Start a Lawn Mower That Has Been Sitting
If your lawn mower has been sitting unused for a while, it might not start right away. Gasoline can break down, and parts can stick or become clogged over time. This guide will walk you through step-by-step instructions to get your mower running smoothly again.
Prepare Your Workspace and Gather Necessary Tools
First, find a flat, well-lit area to work on your mower. Safety comes first, so wear gloves and goggles to protect yourself. Gather tools such as a screwdriver, pliers, a spark plug wrench, and a fuel container if you need fresh gasoline.
Having all items ready will make the process smoother and quicker. Check your mower’s manual if you have it, as it may include model-specific tips for starting or maintenance.
Inspect the Mower for Visible Issues
Before trying to start, perform a quick visual check. Look for dried or cracked hoses, loose wires, or debris stuck in the blades or under the deck. Cleaning dirt and grass clippings helps ensure no blockages prevent the mower from starting.
Make sure the mower is on a level surface and the safety features, like the blade brake or kill switch, are in the correct position. These safety features often disable the engine if not engaged properly.
Change or Add Fresh Fuel
Old gasoline can cause starting problems because it loses its combustibility. Drain the old fuel from the tank and replace it with fresh gasoline. Always use clean fuel and the recommended octane level for your mower.
If your mower uses a fuel mixture (gasoline and oil), ensure the mixture is correct. Stale fuel creates vapors that won’t ignite properly, leading to starting issues.
How to Drain Old Fuel
- Remove the fuel cap and siphon out the gas into a approved container.
- Dispose of old fuel responsibly at a recycling center.
- Clean the fuel tank if you notice any dirt or debris inside.
Check and Replace the Spark Plug
A faulty or dirty spark plug is a common reason a mower won’t start after sitting. Remove the spark plug with a wrench and inspect its condition. Look for cracks, carbon build-up, or corrosion.
If the spark plug is dirty or worn out, replace it with a new one that matches your mower’s specifications. Always set the spark plug gap to the recommended measurement before installing.
Testing the Spark Plug
- Reconnect the spark plug wire.
- Place the metal end against a grounded metal surface on the mower.
- Pull the starter cord and observe if a spark jumps across the electrode.
Check the Air Filter
A clogged or dirty air filter can prevent the engine from starting or running smoothly. Remove the air filter and inspect it for dirt and debris. Clean or replace it as needed.
Regularly maintaining the air filter ensures better airflow and improves starting performance.
Inspect and Clean the Carburetor
Over time, fuel residues can clog the carburetor, making it difficult for the engine to start. Remove the carburetor and examine it for gummed-up parts or dirt. Use carburetor cleaner to flush out deposits.
Be cautious and follow the manufacturer’s instructions for removing and cleaning the carburetor to avoid damaging delicate components.
How to Reassemble the Carburetor
- Ensure all parts are dry and reassemble in the correct order.
- Use fresh gaskets if needed to prevent leaks.
- Reattach the carburetor to the engine securely.
Check the Blade and Mower Deck
A mower with a stuck blade or debris underneath can impede starting. Disconnect the spark plug wire for safety before inspecting.
Manually turn the blade to check for free movement. Remove grass buildup, sticks, or other obstructions from under the deck.
Testing the Reassembled and Serviced Mower
Once all components are cleaned, replaced, and reassembled, double-check all connections. Ensure the safety features are engaged properly.
Find a safe area, tip the mower slightly to check for leaks, and then attempt to start the engine following the standard procedure.
How to Properly Start a Sitting Lawn Mower
Follow these steps in order:
- Make sure the choke is in the “on” position for cold starts.
- Ensure the throttle is set to the “start” or “high” position.
- Engage the safety handle or lever as required.
- Pull the starter cord slowly until you feel resistance, then pull briskly to start the engine.
- If the engine sputters, adjust the choke or throttle accordingly, then try again.
Additional Tips for Success
- Be patient. Sometimes your mower needs a few pulls to come to life after sitting idle.
- If it fails to start after multiple attempts, review the previous steps for overlooked issues.
- Consider using a starting fluid designed for small engines if the engine struggles to catch.
Regular Maintenance Prevents Future Starting Problems
To keep your mower in good shape, perform routine maintenance. Clean or replace the air filter, change the oil, and check the spark plug periodically.
Storing your mower properly also prevents issues. Store it in a dry place, and run the carburetor dry if you plan to store it for an extended period.
Additional Troubleshooting Techniques
If your mower still doesn’t start, check the following:
| Possible Issue | Solution |
|---|---|
| No spark | Replace or repair the ignition coil or spark plug. |
| Fuel flow blocked | Clean the fuel filter and inspect fuel lines for clogs. |
| Engine overheating or seizing | Check for debris in the cooling fins and ensure proper lubrication. |
Safety Precautions During Starting and Maintenance
Always disconnect the spark plug wire before working on the engine. Avoid smoking or open flames near gasoline. Use gloves and eye protection for safety.
By following these detailed steps and tips, your lawn mower should start easily even after sitting idle for a long time. Regular upkeep and proper storage preserve its longevity and performance.
How To Start A Mower That's Been Sitting
Frequently Asked Questions
What steps should I take to check the fuel before starting a lawn mower that has been sitting?
First, inspect the fuel tank for any signs of old or degraded fuel, such as a stale smell or discolored liquid. If necessary, drain the old fuel using a proper container. Refill the tank with fresh, clean gasoline suitable for your mower. This helps prevent starting issues caused by gummed-up fuel that can clog the carburetor and fuel lines.
How can I ensure the spark plug is functioning properly after a period of storage?
Remove the spark plug and inspect it for signs of wear, carbon buildup, or corrosion. Clean the electrode with a wire brush if it appears dirty. Check the gap between the electrodes and adjust it according to the manufacturer’s specifications. Reinstall the spark plug securely or replace it if it shows significant damage. This helps ensure a strong spark to ignite the engine.
What maintenance checks should I perform on the mower’s blades and deck before starting?
Examine the blades for rust, damage, or dullness. Sharpen or replace them if needed to ensure efficient cutting. Clean the deck to remove any accumulated grass or debris that may have built up during storage. A thorough inspection and cleaning help the mower operate smoothly and prevent strain on the engine during startup.
How do I prepare the carburetor when starting a mower that hasn’t been used in a while?
Locate the carburetor and check for any signs of dirt or corrosion. Depending on the model, you may need to adjust the idle screw or manually prime the carburetor by using the primer bulb if available. If the engine doesn’t start after initial attempts, consider cleaning the carburetor with a carburetor cleaner or seeking professional service to remove any deposits that may have formed.
What safety precautions should I follow before attempting to start an idle lawn mower?
Ensure the mower is on a flat, stable surface and that your hands, feet, and clothing stay clear of moving parts. Wear protective gear such as gloves and safety goggles. Disconnect the spark plug wire to inspect or perform maintenance, then reconnect it securely before starting. Following these steps reduces the risk of injury during the startup process.
Final Thoughts
To start a lawn mower that has been sitting, begin by inspecting the fuel tank. Replace old fuel with fresh gasoline and check the oil level. Ensure the spark plug is clean and properly connected.
Next, prime the mower if needed, and set the throttle to the start position. Pull the cord firmly and steadily until the engine fires up. If it doesn’t start immediately, repeat the process, giving it a few extra pulls.
In conclusion, knowing how to start a lawn mower that has been sitting involves checking key components and performing simple maintenance. Proper preparation can save time and prevent frustration. Follow these steps for a quick and effective start.