Craftsman 20HP Briggs & Stratton Won’t Start: Causes & Solutions

The Craftsman with a 20HP Briggs & Stratton engine won’t start, which could be due to various issues such as a faulty spark plug or fuel system problems. If faced with this problem, a few troubleshooting steps can be taken to identify and resolve the issue.

Common Causes Of Engine Failure

Craftsman with 20Hp Briggs & Stratton won’t start due to common causes of engine failure. These may include fuel issues, ignition problems, or mechanical failures within the engine.

Craftsman W/ 20Hp Briggs & Stratton Won’t Start

Having trouble starting your Craftsman with a 20Hp Briggs & Stratton engine? Don’t worry, you’re not alone.

Engine failures can be frustrating, but they can often be resolved by identifying and addressing the underlying issues.

In this blog post, we’ll explore the common causes of engine failure and offer some potential solutions to help get your Craftsman back up and running.

Fuel Issues

• Insufficient Fuel: Ensure that your Craftsman has an adequate fuel supply by checking the fuel tank level. If it’s low, refill it to the recommended level.
• Contaminated Fuel: Over time, fuel can become contaminated with dirt, water, or other debris. Consider draining the old fuel and replacing it with fresh fuel.
• Clogged Fuel Filter: A clogged fuel filter can restrict the flow of fuel to the engine. Check the fuel filter and clean or replace it if necessary.
• Faulty Fuel Pump: If the fuel pump is not delivering fuel properly, it can prevent the engine from starting. Inspect the fuel pump and replace it if needed.

Ignition Problems

• Faulty Spark Plug: A worn-out or damaged spark plug can prevent the engine from starting. Inspect the spark plug for signs of wear or damage and replace it if necessary.
• Improper Spark Plug Gap: Ensure that the spark plug gap is set correctly according to the manufacturer’s specifications. Adjust the gap if needed.
• Faulty Ignition Coil: The ignition coil generates the electrical spark needed to ignite the fuel. If the ignition coil is faulty, it can lead to engine failure. Test the ignition coil and replace it if required.
• Weak Battery: Inspect the battery for corrosion or low charge. Recharge or replace the battery if necessary.

Mechanical Malfunctions

• Dirty Air Filter: A dirty air filter can restrict the airflow to the engine, causing starting issues. Remove the air filter and clean or replace it if it’s dirty.
• Clogged Carburetor: A clogged carburetor can prevent the engine from receiving the proper fuel-air mixture. Clean the carburetor thoroughly or consider using a carburetor cleaner solution.
• Engine Overheating: An overheating engine can cause issues with starting. Check for any signs of overheating and ensure that the cooling system is functioning properly.
• Damaged or Loose Wiring: Inspect the wiring connections and look for any signs of damage or loose connections. Repair or replace any faulty wiring.

Troubleshooting Tips For Fuel Issues

Having trouble starting your Craftsman with a 20Hp Briggs & Stratton engine? Check out these troubleshooting tips for fuel issues, including checking the fuel filter, cleaning the carburetor, and ensuring the fuel is fresh and properly mixed.

With these steps, you’ll be back up and running in no time.

Checking The Fuel Tank

When it comes to fuel issues, the first thing you should do is check the fuel tank.

Here’s what you need to do:

• Inspect the fuel tank for any visible signs of damage.
• Ensure that the fuel tank is filled with fresh and clean gasoline.
• Make sure the fuel tank cap is securely closed to prevent fuel leakage.
• Check for any debris or clogs in the fuel tank that might be hindering the fuel flow.

Verifying Fuel Flow

If the fuel tank seems to be in good condition, the next step is to verify the fuel flow.

Take the following steps:

• Check if the fuel line is properly connected to the fuel tank.
• Ensure that there are no kinks, cracks, or leaks in the fuel line.
• If possible, detach the fuel line from the carburetor and check for fuel flow by turning the engine over. If there is no fuel flow, it indicates a problem with the fuel delivery system.

Inspecting The Fuel Filter

A clogged or dirty fuel filter can also cause starting issues.

Here’s what to do:

• Locate the fuel filter, which is usually located between the fuel tank and the carburetor.
• Remove the fuel filter and visually inspect it for any signs of blockage or dirt accumulation.
• If the fuel filter appears to be clogged or dirty, replace it with a fresh filter.
• Clean the housing where the fuel filter is installed to ensure there is no debris hindering fuel flow.

Resolving Ignition Problems

Having trouble starting your Craftsman with a 20Hp Briggs & Stratton engine? Resolve ignition problems with our expert tips and get your mower up and running smoothly again. Trust us to help you troubleshoot and fix the issue efficiently.

An engine that won’t start can be frustrating, especially when you’re ready to tackle a project. If you have a Craftsman with a 20Hp Briggs & Stratton engine that’s refusing to start, it’s likely that you’re dealing with ignition problems.

Ignition issues can prevent your engine from firing up and can be caused by various factors. In this section, we will discuss the steps to resolve ignition problems and get your Craftsman back up and running efficiently.

Let’s dive into the troubleshooting process!

Testing The Spark Plug:

• Check the spark plug wire connection: Ensure that the spark plug wire is securely connected to both the spark plug and the ignition coil.
• Remove and inspect the spark plug: Take out the spark plug and examine its condition. Look for signs of wear, damage, or buildup. A fouled or worn-out spark plug may require replacement.
• Measure the spark plug gap: Use a gap tool to measure the gap between the center and ground electrodes. The correct gap for your Craftsman’s engine can be found in the owner’s manual. Adjust the gap if necessary.
• Check for spark: Reconnect the spark plug wire to the spark plug. Ground the outer metal casing of the spark plug against the engine block. Have someone pull the engine’s starter cord while you observe for a visible spark between the electrodes. If there’s no spark or a weak spark, it may indicate a faulty ignition coil or ignition module.

Examining The Ignition System:

• Inspect the ignition switch: Ensure that the ignition switch is turned on and functioning correctly. Faulty ignition switches can prevent the proper flow of electricity to the ignition system.
• Check the wiring connections: Examine the wiring connections throughout the ignition system, including the ignition coil, spark plug wire, and ignition module. Look for loose or damaged wires and ensure secure connections.
• Inspect the ignition module: The ignition module controls the timing and delivery of sparks to the spark plug. Inspect it for signs of damage, such as cracked casing or loose wiring. A faulty ignition module may require replacement.

Adjusting The Ignition Coil:

• Locate the ignition coil: The ignition coil is typically mounted near the flywheel on the engine. Refer to the engine’s manual for specific instructions on its location.
• Ensure proper air gap: Check the air gap between the ignition coil and the flywheel. Use a feeler gauge to measure the gap, and adjust it according to the manufacturer’s specifications if necessary. An incorrect air gap can affect the engine’s ability to produce sparks.
• Inspect the ignition coil for wear or damage: Look for signs of wear or damage on the ignition coil, such as cracks or corrosion. Faulty ignition coils may need to be replaced.

Fixing Mechanical Malfunctions

Craftsman W/ 20Hp Briggs & Stratton won’t start? Learn effective solutions from a professional to fix mechanical malfunctions and get your lawn mower running smoothly again.

In this section, we’ll explore three key areas to check when troubleshooting starting issues: the air filter, carburetor, and valve clearance.

Checking The Air Filter:

• Begin by locating the air filter on your Craftsman mower.
• Remove the air filter cover and inspect the air filter for any dirt, debris, or damage.
• If the air filter is dirty or clogged, clean it or replace it with a new one.
• A clean air filter allows for proper airflow, ensuring efficient combustion and a smooth start.

Inspecting The Carburetor:

• The carburetor is responsible for mixing fuel and air before it enters the engine cylinder.
• Start by removing the air filter cover, followed by the air filter itself.
• Locate the carburetor and visually inspect it for any signs of dirt or debris.
• Clean the carburetor using carburetor cleaner and a small brush to remove any obstructions that may be preventing fuel flow.
• Ensure that the carburetor bolts, connections, and linkages are tight and properly secured.
• If these steps don’t resolve the issue, you may need to consider rebuilding or replacing the carburetor.

Assessing The Valve Clearance:

• Valve clearance refers to the space between the valves and the rocker arms.
• If the valve clearance is too small or too large, it can prevent proper engine compression and hinder starting.
• Consult your owner’s manual to locate the valve clearance specifications for your particular mower model.
• Using a feeler gauge, check the valve clearance by inserting it between the valve and rocker arm.
• If the clearance is not within the specified range, you may need to adjust the valve clearance accordingly.

Additional Factors Affecting Engine Failure

Engine failure in a Craftsman with a 20Hp Briggs & Stratton engine may be caused by additional factors such as a faulty spark plug, clogged fuel filter, or insufficient fuel supply.

Let’s take a look at some additional areas to consider when troubleshooting engine failure.

Electrical Connections:

• Check the spark plug wire connections: Ensure they are secure and tightly connected to both the spark plug and the ignition coil. Loose connections can prevent the engine from starting.
• Inspect the wiring harness: Look for any signs of damage or frayed wires. Faulty wiring can disrupt the flow of electricity, inhibiting the engine from starting.
• Examine the battery: Make sure the battery is properly charged and free from any corrosion. A weak or damaged battery can prevent the engine from turning over.

Cooling System Problems:

• Monitor the coolant level: Ensure the coolant reservoir is filled to the recommended level. Low coolant can cause the engine to overheat, resulting in starting issues.
• Check the radiator for debris: A clogged radiator can impede airflow, leading to overheating and difficulty starting the engine. Clear any debris that may be obstructing the radiator.
• Inspect the cooling fan: Ensure that the fan is functioning properly. A malfunctioning fan can cause the engine to overheat, resulting in starting problems.

Compression Issues:

• Test the compression: Using a compression tester, check the compression levels in each cylinder. Low compression can indicate a faulty piston or valve seal, resulting in difficulty starting the engine.
• Inspect the piston rings: Damaged or worn-out piston rings can lead to decreased compression and difficulty starting the engine. If necessary, replace the piston rings.
• Verify the valve clearance: Incorrect valve clearance can affect compression. Refer to the engine’s manual for specifications and adjust the valves accordingly.

Preventive Measures For Maintaining A Healthy Engine

Maintaining a healthy engine is crucial for the Craftsman W/ 20Hp Briggs & Stratton to start. Follow preventive measures like regular oil changes, air filter cleaning, fuel stabilizer usage, spark plug inspection, and battery maintenance to ensure smooth engine performance.

Let’s discuss three essential areas of maintenance: regular oil changes, proper air filter maintenance, and fuel system cleanliness.

Regular Oil Changes

• Change the oil every 25 hours of operation or at least once a year.
• Ensure the engine is off and cool before beginning the oil change process.
• Locate the oil drain plug beneath the engine and remove it with a wrench.
• Allow the old oil to completely drain into a suitable container.
• Replace the oil filter with a new one to maintain optimum functionality.
• Refill the engine with appropriate oil, following the manufacturer’s recommendations.
• Dispose of the used oil and filter responsibly.

Proper Air Filter Maintenance

• Inspect the air filter regularly and clean or replace it as needed.
• Remove the air filter cover, typically secured with screws or clips.
• Examine the filter for dirt, debris, and dust accumulation.
• If the filter is dirty, gently tap it on a solid surface to dislodge loose particles.
• For heavily soiled filters, consider using compressed air to blow away the debris.
• If the air filter shows signs of damage or excessive dirt after cleaning, replace it.
• Reinstall the air filter cover securely.

Fuel System Cleanliness

• Use clean, fresh fuel to prevent clogs and maintain optimal engine performance.
• Add a fuel stabilizer to the gas can when storing the machine for an extended period.
• Avoid using gasoline that has been sitting for more than 30 days.
• Regularly inspect the fuel line for any signs of damage or leaks.
• Clean the fuel filter to prevent blockages.
• Turn off the engine and disconnect the spark plug wire before performing any maintenance on the fuel system.
• Use a fuel additive periodically to keep the fuel system clean and prevent fuel-related issues.

How Can I Troubleshoot My Craftsman Mower That Won’t Start?

If your Craftsman mower with a 20Hp Briggs & Stratton engine won’t start, try checking those step:

01. Step Check the Basics

• Fuel: Seems obvious, but it happens! Make sure you have fresh fuel in the tank and the fuel valve is open.
• Oil: Check your oil level and top up if necessary. Many mowers have safety mechanisms that prevent starting if the oil is low.
• Spark Plug: Remove the spark plug. Clean or replace it if you find it blackened, wet, or damaged. Search online for a quick tutorial on how to test your spark plug for spark.

02. Step : Airflow Issues

• Air Filter: A clogged air filter chokes your engine. Check the filter – clean or replace it if it’s extremely dirty.
• Choke: Ensure the choke is opening and closing freely. Refer to your owner’s manual if you’re unsure of its operation.

03. Step: Fuel Delivery Problems

• Fuel Line: Look for cracked, kinked, or blocked fuel lines. Replace any damaged sections.
• Fuel Filter: Many mowers have an inline fuel filter. Inspect it for blockages and replace it if it appears clogged.
• Carburetor: A dirty or gummed-up carburetor will cause starting issues. Cleaning the carburetor is a more advanced task, but there are plenty of online tutorials available.

04. Step : Battery Issues (Riding Mowers)

• Battery Charge: Test the battery with a voltmeter. If the voltage is low, charge or replace the battery.
• Connections: Check battery terminals for corrosion. Clean and tighten any loose connections.

05. Step : Advanced Troubleshooting (Optional)

• Compression: Low compression can prevent starting. This requires a compression tester and a bit more technical knowledge.
• Ignition Coil: A faulty ignition coil won’t produce a spark. You can find online guides for testing these.

Frequently Asked Questions

What Are Some Common Reasons For A Craftsman Mower Not Starting?

There are several possible reasons for a Craftsman mower with a 20Hp Briggs & Stratton engine not starting. These include a clogged fuel filter, a faulty spark plug, a dirty carburetor, a drained battery, or an improperly positioned ignition switch.

By inspecting these components, you can often identify and resolve the issue.

Why Does My Craftsman Mowers Engine Not Turn Over?

If the engine of your Craftsman mower with a 20Hp Briggs & Stratton engine doesn’t turn over, it could be due to various factors. Insufficient fuel, a faulty starter motor, a discharged battery, or loose or corroded electrical connections might be to blame.

Promptly investigate these possibilities to get your mower up and running again.

Do I Need To Prime The Engine Before Starting My Craftsman Mower?

Yes, it is recommended to prime the engine before starting your Craftsman mower with a 20Hp Briggs & Stratton engine.

Priming the engine helps draw fuel into the carburetor, enabling smoother starts. Refer to your mower’s user manual for specific instructions on how to prime the engine properly.

Final Warp

Troubleshooting a Craftsman with a 20Hp Briggs & Stratton that won’t start can be a frustrating experience, but by following these steps, you can likely identify and resolve the issue. Begin by checking the fuel and spark plug, ensuring they are clean and functioning properly.

Assess the carburetor for any clogs or damage, and consider cleaning or replacing it if necessary. Take a look at the ignition system, including the ignition coil and flywheel key, and replace or repair any faulty components. Finally, check the engine compression to rule out any major mechanical issues.

By systematically troubleshooting these common areas, you can increase the likelihood of getting your Craftsman mower up and running again. Remember, regular maintenance and preventative measures, such as cleaning or replacing filters, can help prevent future starting issues.