Ariens Lawn Mower Won’t Start – Step-by-Step Troubleshooting Guide (Problems & Fixes)

Having trouble starting your Ariens lawn mower? Don’t worry, we’re here to help! A lawn mower that won’t start can be frustrating, but with the right troubleshooting steps, you can quickly identify the problem and get your mower up and running again. In this guide, we’ll provide you with expert advice and step-by-step instructions to diagnose common issues that may be preventing your Ariens lawn mower from starting.

From checking the battery and spark plug to examining the fuel system and ignition, we’ll walk you through each troubleshooting step to help you find the solution. So, let’s get started and get your Ariens lawn mower back to its cutting power!

Zero-Turn Lawn Mower Service Tools & Equipment

When troubleshooting a zero-turn lawn mower that won’t start, you may need the following tools and equipment:

1. Socket set: A set of sockets and wrenches of various sizes to remove and install components.
2. Multimeter: Used to test electrical connections, voltage, and continuity.
3. Spark plug wrench: Specifically designed to remove and install spark plugs.
4. Screwdrivers: Both flathead and Phillips head screwdrivers for removing screws and fasteners.
5. Pliers: Used for gripping and manipulating wires, hoses, and small parts.
6. Fuel pressure gauge: Used to check the fuel system’s pressure and ensure proper fuel delivery.
7. Compression tester: Measures the compression level in the engine cylinders.
8. Carburetor cleaning kit: Includes carburetor cleaner, brushes, and other tools for cleaning the carburetor.
9. Wire brush: Used to clean electrical connections and remove rust or debris.
10. Safety goggles and gloves: To protect your eyes and hands while working on the mower.
11. Drain pan: Used to catch any spilled fluids during maintenance or troubleshooting.
12. Fuel container: A clean container to drain and store fuel during maintenance.
13. Shop rags or towels: For cleaning and wiping off components, as well as soaking up spills.
14. Replacement parts: Depending on the diagnosis, you may need to have replacement parts such as spark plugs, fuel filters, ignition coils, etc., on hand.

Please note that the specific tools required may vary depending on the make and model of the zero-turn lawn mower and the troubleshooting steps you need to take. Always consult the mower’s manual and follow the manufacturer’s guidelines for troubleshooting and maintenance.

Service Table for Ariens Lawn Mower Won’t Start

Here’s a service table to help troubleshoot an Ariens lawn mower that won’t start:

Note: The required replacements mentioned in the table

How to Check the Battery

To check the battery on your Ariens lawn mower if it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition to prevent accidental starting.
2. Locate the battery: The battery is typically located under the seat or in the engine compartment. Refer to your mower’s manual for the exact location.
3. Inspect the battery terminals: Check the battery terminals for any signs of corrosion, such as a white powdery substance. Corrosion can disrupt the electrical connection.
4. Clean the battery terminals: If corrosion is present, use a wire brush or a battery terminal cleaner to remove it. Gently scrub the terminals until they are clean and shiny.
5. Check the battery connections: Ensure that the battery cables are securely connected to the terminals. Give them a gentle tug to ensure they are tight and not loose.
6. Measure the battery voltage: Use a multimeter set to DC voltage to measure the battery voltage. Place the positive (red) probe on the positive terminal and the negative (black) probe on the negative terminal. A fully charged battery should read around 12.6 volts or higher.
7. Charge the battery: If the voltage is below 12.6 volts, the battery may be discharged. Connect a battery charger to the battery and follow the charger’s instructions to charge the battery fully.
8. Retest the battery voltage: After charging the battery, retest the voltage to ensure it has reached the appropriate level.
9. Replace the battery if necessary: If the battery fails to hold a charge or is significantly discharged even after charging, it may need to be replaced. Consult your mower’s manual for the correct battery specifications and replacement procedure.
10. Reinstall the battery: Once the battery is clean, charged, or replaced, reconnect the battery cables to the appropriate terminals, ensuring a secure connection.

Remember to always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions when working with the battery.

If the issue persists even after checking the battery, further troubleshooting may be required.

How to Inspect the Spark Plug

To inspect the spark plug on your Ariens lawn mower if it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition to prevent accidental starting. Allow the engine to cool down completely before proceeding.
2. Locate the spark plug: The spark plug is typically located on the side of the engine cylinder head. Refer to your mower’s manual for the exact location.
3. Remove the spark plug boot: Grasp the rubber boot firmly and twist it counterclockwise to detach it from the spark plug. Pull the boot straight off the spark plug.
4. Clean the area around the spark plug: Use a brush or compressed air to remove any dirt or debris around the spark plug. This will prevent contaminants from falling into the cylinder when the plug is removed.
5. Remove the spark plug: Use a spark plug socket and ratchet to loosen and remove the spark plug by turning it counterclockwise. Be careful not to drop the spark plug into the engine compartment.
6. Inspect the spark plug: Examine the spark plug for signs of wear, damage, or fouling. Look for any oil deposits, carbon buildup, or a worn electrode. A healthy spark plug should have a clean, tan-colored insulator and a gap between the center electrode and the ground electrode.
7. Clean or replace the spark plug: If the spark plug is dirty, use a wire brush or a spark plug cleaner to remove any carbon deposits. If the spark plug is damaged, worn, or fouled, it is recommended to replace it with a new one. Consult your mower’s manual for the correct spark plug specifications and replacement procedure.
8. Set the spark plug gap: If you are installing a new spark plug, ensure that the electrode gap is set to the manufacturer’s specifications. Use a spark plug gap tool to carefully adjust the gap if necessary.
9. Install the spark plug: Carefully thread the spark plug into the spark plug hole by hand to avoid cross-threading. Once it is hand-tight, use the spark plug socket and ratchet to tighten it further, turning it clockwise. Be cautious not to overtighten the spark plug.
10. Reattach the spark plug boot: Push the rubber boot firmly onto the spark plug until it clicks into place. Give it a gentle tug to ensure it is securely connected.

After inspecting and cleaning or replacing the spark plug, attempt to start the lawn mower. If the issue persists, further troubleshooting may be necessary.

Always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions when working with the spark plug.

How to Check the Air Filter

To check the air filter on your Ariens lawn mower if it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition to prevent accidental starting. Allow the engine to cool down completely before proceeding.
2. Locate the air filter housing: The air filter housing is typically a rectangular or cylindrical box located on the side or top of the engine. Refer to your mower’s manual for the exact location.
3. Remove the air filter cover: Depending on the model, the air filter cover may be secured with screws, clips, or latches. Use the appropriate tool (e.g., screwdriver, pliers) to loosen and remove any fasteners holding the cover in place.
4. Remove the air filter: Lift the air filter out of the housing. Take note of its orientation for proper reinstallation later.
5. Inspect the air filter: Examine the air filter for dirt, debris, or damage. A clogged or dirty air filter can restrict airflow to the engine, leading to starting problems. If the filter appears excessively dirty or damaged, it may need cleaning or replacement.
6. Clean the air filter (if reusable): If you have a reusable air filter, you can clean it by tapping it gently against a flat surface or using compressed air to blow out the debris. Be careful not to damage the filter material.
7. Replace the air filter (if necessary): If the air filter is excessively dirty or damaged, it is recommended to replace it with a new one. Check your mower’s manual for the correct replacement part number and specifications. Ensure the new filter matches the size and shape of the original.
8. Reinstall the air filter: Place the cleaned or new air filter back into the air filter housing, aligning it properly with any tabs or grooves. Ensure it sits securely and snugly in place.
9. Reattach the air filter cover: Align the cover with the housing and secure it using the appropriate fasteners. Tighten any screws or clips until they are snug but not overtightened.
10. Start the lawn mower: After checking and cleaning or replacing the air filter, attempt to start the lawn mower. If the issue persists, further troubleshooting may be necessary. Always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions when working with the air filter.

Regular maintenance of the air filter is important to keep your lawn mower running smoothly.

It is recommended to check and clean or replace the air filter as per the manufacturer’s guidelines or at least once per mowing season, or more frequently if operating in dusty or dirty conditions.

How to Check the Fuel Filter

To examine the fuel filter on your Ariens lawn mower if it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition to prevent accidental starting. Allow the engine to cool down completely before proceeding.
2. Locate the fuel filter: The fuel filter is typically located along the fuel line between the fuel tank and the carburetor. It may be a small, cylindrical or rectangular-shaped component with an inlet and outlet.
3. Prepare the workspace: Place a clean cloth or rag underneath the fuel filter to catch any fuel that may spill during the examination.
4. Disconnect the fuel line: Depending on the type of fuel filter and fuel line connection, you may need to use pliers or a wrench to loosen and disconnect the fuel line from the filter. Be cautious as there may be some fuel leakage.
5. Inspect the fuel filter: Once the fuel line is disconnected, carefully examine the fuel filter for any signs of dirt, debris, or clogs. A dirty or clogged fuel filter can prevent proper fuel flow to the engine, causing starting issues.
6. Clean or replace the fuel filter: If the fuel filter appears dirty or clogged, you have two options:
   • Clean the fuel filter: If it is a reusable fuel filter, you can clean it by rinsing it with clean gasoline or using a small brush to remove debris. Allow the filter to dry thoroughly before reinstallation.
   • Replace the fuel filter: If the fuel filter is severely clogged or damaged, it is recommended to replace it with a new one. Check your mower’s manual for the correct replacement part number and specifications. Ensure the new filter matches the size and shape of the original.
7. Reconnect the fuel line: Once the fuel filter is clean or replaced, reconnect the fuel line to the filter. Make sure it is securely fastened and there are no fuel leaks.
8. Start the lawn mower: After examining and cleaning or replacing the fuel filter, attempt to start the lawn mower. If the issue persists, further troubleshooting may be necessary. Always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions when working with the fuel system.

Regular maintenance of the fuel filter is important to ensure proper fuel flow and prevent starting issues.

It is recommended to inspect and clean or replace the fuel filter as per the manufacturer’s guidelines or at least once per mowing season, or more frequently if you notice any signs of fuel flow problems or contamination.

How to Inspect the Ignition System

To inspect the ignition system on your Ariens lawn mower if it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition to prevent accidental starting. Allow the engine to cool down completely before proceeding.
2. Locate the ignition system components: The ignition system includes several components, such as the spark plug, ignition coil, and spark plug wire. Familiarize yourself with the location of these parts on your Ariens lawn mower.
3. Remove the spark plug wire: Locate the spark plug wire, which is usually a thick rubber wire connected to the spark plug. Firmly grasp the rubber boot at the end of the wire and gently twist it while pulling to disconnect it from the spark plug.
4. Inspect the spark plug wire: Check the spark plug wire for any visible damage, such as cracks, cuts, or excessive wear. If you notice any signs of damage, it is recommended to replace the spark plug wire.
5. Remove the spark plug: Use a spark plug socket and a ratchet or spark plug wrench to remove the spark plug from the engine. Turn it counterclockwise to loosen and remove it.
6. Inspect the spark plug: Examine the spark plug for any signs of fouling, such as a worn electrode, excessive carbon deposits, or oil residue. If the spark plug is dirty or damaged, it may need cleaning or replacement.
7. Clean or replace the spark plug: Depending on the condition of the spark plug, you have two options:
   • Clean the spark plug: If the spark plug is dirty but still in good condition, you can clean it using a wire brush or a spark plug cleaner. Remove any carbon deposits or debris from the electrode and ensure the spark gap is clean and free of obstructions.
   • Replace the spark plug: If the spark plug is fouled, damaged, or excessively worn, it is recommended to replace it with a new one. Consult your Ariens lawn mower’s manual for the correct spark plug type and specifications.
8. Check the ignition coil: Inspect the ignition coil for any visible damage, such as cracks or loose connections. Ensure that all the wires are securely connected to the coil. If there are any signs of damage, it is recommended to replace the ignition coil.
9. Reinstall the spark plug: Once the spark plug is clean or replaced, carefully thread it back into the engine by hand. Use the spark plug socket and ratchet or spark plug wrench to tighten it snugly, but avoid over-tightening.
10. Reconnect the spark plug wire: Slide the spark plug wire’s rubber boot over the spark plug until it is seated firmly. You should hear a slight click or feel resistance when it is properly connected.
11. Start the lawn mower: After inspecting the ignition system, attempt to start the lawn mower. If the issue persists, further troubleshooting may be necessary. Always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions when working with the ignition system.

Regular inspection and maintenance of the ignition system are important for reliable engine starting. It is recommended to inspect the spark plug, spark plug wire, and ignition coil periodically or as per the manufacturer’s guidelines. If you’re unsure about any aspect of the inspection or need assistance, consult a qualified technician or refer to your Ariens lawn mower’s manual.

How to Test the Carburetor

To test the carburetor on your Ariens lawn mower if it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition. Allow the engine to cool down completely before proceeding.
2. Locate the carburetor: The carburetor is typically mounted on the side of the engine and has a fuel line connected to it. Familiarize yourself with the location of the carburetor on your Ariens lawn mower.
3. Check the fuel level: Ensure there is enough fuel in the gas tank to reach the carburetor. If the fuel level is low, refill the tank with fresh gasoline.
4. Inspect the fuel line: Visually inspect the fuel line for any signs of damage, such as cracks, leaks, or blockages. If you notice any issues with the fuel line, it may need to be replaced.
5. Check the fuel filter: If your Ariens lawn mower is equipped with a fuel filter, inspect it for any clogs or dirt. If the filter appears dirty or clogged, it is recommended to replace it.
6. Perform a fuel flow test: Disconnect the fuel line from the carburetor and place a clean container underneath. Turn the fuel valve on, if applicable, and observe if fuel flows freely from the line into the container. If there is little or no fuel flow, there may be a blockage in the fuel line or a malfunctioning fuel valve.
7. Inspect the carburetor for blockages: Remove the air filter cover and the air filter to access the carburetor. Carefully inspect the carburetor for any visible signs of blockages, such as dirt, debris, or clogged passages. Use a small brush or compressed air to clean out any obstructions you find.
8. Check the carburetor adjustments: The carburetor has various adjustment screws, such as the idle adjustment screw and the fuel mixture screw. Ensure that these screws are set to the manufacturer’s recommended settings. If they have been tampered with or are not properly adjusted, it can affect the engine’s starting and running performance.
9. Test the carburetor’s fuel delivery: To determine if the carburetor is delivering fuel properly, you can perform a fuel delivery test. Carefully remove the spark plug and inspect it for wetness. If the spark plug is dry, it indicates that fuel is not reaching the combustion chamber, which may be a carburetor issue.
10. Clean or rebuild the carburetor: If you suspect that the carburetor is the cause of the starting problem and you have not found any other issues, it may be necessary to clean or rebuild the carburetor. Cleaning the carburetor involves removing it from the engine and using carburetor cleaner to remove any deposits and blockages. Rebuilding the carburetor may be required if there are damaged or worn-out internal components.
11. Reinstall the carburetor: After cleaning or rebuilding the carburetor, reinstall it onto the engine, ensuring all connections are secure and properly tightened.
12. Start the lawn mower: After performing the carburetor test and any necessary cleaning or adjustments, attempt to start the lawn mower. If the issue persists, further troubleshooting may be necessary. Always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions when working with the carburetor.

Regular maintenance and cleaning of the carburetor are essential for proper engine performance. It is recommended to follow the manufacturer’s guidelines for cleaning and adjusting the carburetor or consult a qualified technician if you are unsure.

How to Check the Engine Oil Level

To check the engine oil level on your Ariens lawn mower when it won’t start, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition. Allow the engine to cool down completely before proceeding.
2. Locate the oil dipstick: The oil dipstick is usually located on the side of the engine, near the bottom. It is a long rod or stick with a handle or loop on top.
3. Clean the dipstick: Use a clean cloth or rag to wipe off any dirt or debris from the dipstick. This ensures an accurate reading of the oil level.
4. Remove the dipstick: Pull the dipstick out of the engine and wipe it clean with a cloth or rag.
5. Reinsert the dipstick: Fully insert the dipstick back into the engine until it is seated properly.
6. Remove the dipstick again: Pull the dipstick out of the engine once more, but this time pay attention to the oil level markings on the dipstick.
7. Check the oil level: Observe the oil level on the dipstick. There are usually two marks or indicators on the dipstick: a “Full” mark or indicator and a “Add” mark or indicator. The oil level should ideally be between these two marks.
8. Evaluate the oil level: If the oil level is below the “Add” mark or indicator, it indicates that the engine oil is low and needs to be topped up. If the oil level is above the “Full” mark or indicator, it means that there is too much oil in the engine and it needs to be drained or reduced to the correct level.
9. Top up or drain the oil if necessary: If the oil level is low, add the recommended type and amount of oil for your Ariens lawn mower. Use a funnel to avoid spills. If the oil level is high, you may need to drain some oil until it reaches the correct level. Refer to your Ariens lawn mower’s manual for the specific oil type and capacity.
10. Recheck the oil level: After adding or draining the oil, repeat the steps above to check the oil level again and ensure it is within the acceptable range.
11. Replace the dipstick: Once you have confirmed the oil level is correct, securely reinsert the dipstick into the engine until it is fully seated.

Checking the engine oil level is an important maintenance task that should be done regularly, even if your lawn mower won’t start. It helps to ensure proper lubrication and performance of the engine. If the oil level is correct and the mower still won’t start, further troubleshooting may be necessary.

Always refer to your Ariens lawn mower’s manual for specific instructions and safety precautions regarding oil checks and maintenance.

How to Test the Safety Switch

To test the safety switch on your Ariens lawn mower, follow these step-by-step instructions:

1. Safety first: Ensure the lawn mower is turned off and remove the key from the ignition. Make sure the engine is completely cool before proceeding.
2. Locate the safety switch: The safety switch is typically located near the engine or on the control panel of the lawn mower. It may be a lever, button, or switch-type mechanism.
3. Inspect the safety switch: Visually inspect the safety switch for any signs of damage, such as corrosion, loose connections, or worn-out parts. If you notice any issues, the safety switch may need to be replaced.
4. Identify the purpose of the safety switch: Understand the role of the safety switch in your lawn mower. It is designed to prevent the engine from starting or running if certain conditions are not met, such as the mower deck being engaged, the seat being occupied, or the brake pedal being depressed.
5. Check the seat safety switch: If your Ariens lawn mower has a seat safety switch, sit on the seat and ensure it is engaged properly. Some mowers require you to be sitting on the seat for the engine to start or run. If the seat safety switch is not functioning correctly, it may need adjustment or replacement.
6. Test the brake safety switch: If your Ariens lawn mower has a brake safety switch, press the brake pedal and ensure it is fully engaged. Some mowers require the brake pedal to be pressed for the engine to start or run. If the brake safety switch is not working properly, it may need adjustment or replacement.
7. Check the mower deck safety switch: If your Ariens lawn mower has a mower deck safety switch, ensure the mower deck is disengaged or in the raised position. Some mowers require the mower deck to be disengaged for the engine to start or run. If the mower deck safety switch is malfunctioning, it may need adjustment or replacement.
8. Test the operation: With all safety switches in their proper positions, attempt to start the engine by turning the ignition key or engaging the start button. If the engine starts and runs normally, the safety switches are functioning as intended. If the engine still doesn’t start, it is recommended to consult a qualified technician or refer to the Ariens lawn mower’s manual for further troubleshooting steps.
9. Perform regular maintenance: Keep the safety switches clean and free from debris. Check the connections periodically to ensure they are secure and not corroded.

Testing the safety switch is crucial for ensuring the safe operation of your Ariens lawn mower. If you encounter any issues or are unsure about the functionality of the safety switches, it is always best to consult a professional or refer to the manufacturer’s guidelines.

Ariens Lawn Mower Won’t Start F.A.Q.

Q1: Why won’t my Ariens lawn mower start?
A: There could be several reasons why your Ariens lawn mower won’t start. Common causes include a dead battery, a faulty spark plug, clogged air filter, dirty fuel filter, ignition system issues, or a malfunctioning carburetor. It’s important to systematically troubleshoot each potential problem to determine the exact cause.

Q2: How can I determine if the battery is the problem?
A: To check the battery, use a multimeter to measure its voltage. A fully charged battery should read around 12.6 volts. If the reading is significantly lower, the battery may be discharged or faulty. Recharge the battery or replace it if necessary.

Q3: What should I do if the spark plug is fouled?
A: If the spark plug is fouled, remove it and inspect the electrode for carbon deposits, damage, or excessive wear. Clean the spark plug using a wire brush or replace it if necessary. Ensure the spark plug is properly gapped according to the manufacturer’s specifications before reinstalling it.

Q4: How often should I clean or replace the air filter?
A: It is recommended to clean or replace the air filter at least once per mowing season or more frequently if you mow in dusty conditions. Inspect the air filter and clean it if it is dirty or clogged. If it’s damaged or excessively dirty, replace it with a new one.

Q5: How do I clean the fuel filter?
A: The fuel filter is typically located between the fuel tank and the carburetor. Disconnect the fuel line from the carburetor and remove the fuel filter. Clean it by blowing compressed air through it or by using a small brush and a solvent. If the filter is damaged or heavily clogged, it is recommended to replace it.

Q6: What can cause ignition system problems?
A: Ignition system problems can be caused by a faulty ignition coil, ignition switch, or damaged spark plug wire. Inspect these components for any visible damage or wear. Check the spark plug wire for good connection and replace if necessary. If the ignition system components are suspected to be faulty, they should be tested or replaced by a qualified technician.

Q7: How can I test the carburetor on my Ariens lawn mower?
A: Testing the carburetor requires a good understanding of its components and functions. It is recommended to have it inspected and serviced by a professional technician who can use specialized tools and equipment to diagnose any issues and perform necessary adjustments or repairs.

Q8: Can low oil level cause starting problems?
A: Yes, a low oil level can cause starting problems in some cases. The engine may have a safety feature that prevents it from starting if the oil level is below the recommended range. Always check the engine oil level and top it up if necessary before attempting to start the mower.

If you are unable to resolve the issue with your Ariens lawn mower not starting, it is advised to consult a qualified technician or refer to the manufacturer’s manual for further troubleshooting steps specific to your model.