Briggs & Stratton engines are known for their reliability, powering the likes of lawn mowers and generators. But like any engine, they can run into performance issues over time. Whether your engine won’t start, runs rough, or stalls unexpectedly, knowing how to troubleshoot it can save you both time and money. Here’s a step-by-step guide to help you diagnose common problems and get your engine running smoothly again.

1. Check the Fuel Supply

Why it matters: Old or contaminated fuel is one of the most common causes of engine trouble.

• What to do: Make sure the tank has fresh gasoline (less than 30 days old). If the fuel smells sour or looks dark, drain it and refill with clean, fresh fuel.
  
  
• Tip: Use a fuel stabilizer if you won’t be running the engine for a while.

Briggs & Stratton fuel parts can be found here on our website.

2. Inspect the Air Filter

Why it matters: A clogged air filter can choke the engine, causing poor performance or failure to start.

• What to do: Remove the air filter cover and check for dirt or debris. If it’s paper, replace it. If it’s foam, wash it with warm soapy water, let it dry, and apply a little engine oil before reinstalling.

Briggs & Stratton air filter parts can be found here on our website.

3. Check the Spark Plug

Why it matters: Without a strong spark, the fuel-air mixture won’t ignite.

• What to do: Remove the spark plug using a socket wrench. Inspect for carbon buildup, corrosion, or damage. If dirty, clean it with a wire brush; if worn or cracked, replace it. Make sure the spark plug gap matches the Briggs & Stratton specifications.

Briggs & Stratton spark plug parts can be found here on our website.

4. Look for Fuel Line or Carburetor Problems

Why it matters: Even with good fuel, a clogged line or carburetor will prevent the engine from running.

• What to do: Check the fuel line for kinks, cracks, or blockages. If the carburetor is dirty, you may need to clean it with carburetor cleaner or rebuild it using a kit.

Briggs & Stratton fuel parts can be found here on our website.

5. Examine the Oil Level and Condition

Why it matters: Low or dirty oil can cause overheating, excessive wear, and even engine failure.

• What to do: Check the dipstick to ensure oil is at the proper level and looks clean. If it’s dark or gritty, perform an oil change.

Briggs & Stratton oil parts can be found here on our website.

When to Seek Professional Help

If you’ve checked the basics and the engine still won’t run properly, it may be time to consult a Briggs & Stratton service center. Issues like internal damage, advanced carburetor problems or electrical faults can require specialized tools and expertise.