If you’re looking for a clear guide on how to start Briggs and Stratton lawn mower, you’ve come to the right place. Briggs & Stratton engines have specific starting procedures that ensure reliable operation every time. Following the correct steps is the key to a quick start and a long engine life.
This guide will walk you through every step, from pre-start checks to troubleshooting a stubborn engine. We’ll cover both manual recoil and electric start models. Let’s get your mower running smoothly.
How To Start Briggs And Stratton Lawn Mower
Starting your mower correctly protects the engine and gets the job done fast. The process is simple once you know the order of operations. Always refer to your specific model’s manual for any unique instructions.
First, perform these essential checks before you even attempt to pull the cord or turn the key. Skipping these can lead to starting problems or even damage.
Pre-Start Checklist And Safety
Your safety and the mower’s condition are the top priorities. A quick inspection takes only a minute but saves a lot of frustration.
Find a flat, clear area to work. Ensure the mower is on level ground and away from children or pets.
- Check the Oil Level: Use the dipstick. Add oil if it’s low, but avoid overfilling. Clean oil is crucial for engine lubrication.
- Inspect the Air Filter: A dirty air filter chokes the engine. Tap out debris or replace a very dirty filter.
- Verify Fuel Level: Use fresh, clean gasoline. Old fuel (over 30 days) can cause starting issues. For engines with a fuel valve, ensure it’s in the “On” position.
- Clear the Deck: Remove any grass clippings, twigs, or debris from under the mowing deck. This prevents clogs and allows the blade to spin freely.
- Wear Proper Footwear: Always wear sturdy shoes, not sandals, when operating any lawn mower.
Understanding Your Mower’s Controls
Locate these common controls on your Briggs and Stratton powered mower. Their exact placement may vary slightly.
- Recoil Starter Handle: The pull-cord for manual starting.
- Ignition Key: For electric start models.
- Throttle/Choke Control: Often a lever on the engine. “Choke” for cold starts, “Fast” for running, “Slow” for idle.
- Primer Bulb: A red rubber button you press 3 times to draw fuel into the carburetor.
- Blade Control Lever (Deadman’s Switch): Must be held down against the handle to keep the engine running.
- Fuel Valve: A small lever on the fuel line or tank; “On” and “Off” positions.
Step-By-Step Starting Procedure For A Cold Engine
A “cold” engine means it hasn’t been run for several hours. This requires a richer fuel mixture, which the choke or primer provides.
- Connect the Spark Plug Wire: Ensure it’s firmly attached to the spark plug. This is a common oversight.
- Engage the Blade Control: Hold the lever down against the mower handle. On some models, you must also hold a separate brake lever.
- Set the Throttle to Choke: Move the throttle lever to the “Choke” position. If you have a primer bulb, press it three times slowly until you see fuel in the bulb.
- Pull the Starter Cord (or Turn Key): For recoil: Pull the starter cord briskly. Do not yank it all the way out; use a smooth, strong motion. For electric: Turn the ignition key. The engine should start within a few seconds.
- Adjust the Choke: Once the engine fires, move the throttle lever from “Choke” to “Fast” or the halfway position. Let it warm up for 30 seconds before mowing.
Starting A Warm Engine
If the engine has been run recently and is still warm, the process is simpler. You typically will not need the choke.
- Engage the blade control lever.
- Set the throttle to “Fast” or the normal running position.
- If the engine is very warm, you might need to set it to “Half-Choke” for one pull.
- Pull the starter cord or turn the key. It should start with one or two pulls.
What To Do If The Engine Floods
Flooding happens when too much fuel enters the cylinder, often from excessive priming or choking. You’ll smell a strong gasoline odor.
- Move the throttle lever to “Fast.”
- Wait 15 minutes to let excess fuel evaporate.
- Then, try starting without using the primer or choke.
Troubleshooting Common Starting Problems
Even with perfect steps, your mower might not start. Here are the most frequent causes and fixes.
Mower Won’t Start or Cranks But Doesn’t Fire
- Old Fuel: The number one cause. Drain the tank and carburetor, then refill with fresh gas.
- Faulty Spark Plug: Remove the plug, reconnect the wire, and rest the metal base against the engine. Pull the starter cord; you should see a blue spark. If not, replace the plug.
- Clogged Carburetor: Old fuel leaves varnish that clogs small jets. This often requires cleaning by a technician.
- Disconnected Wire: Double-check the spark plug wire and any safety switch connections.
Engine Starts Then Stops Immediately
- Dirty Air Filter: Replace or clean it.
- Clogged Fuel Cap Vent: Try loosening the fuel cap. If the engine runs, replace the cap; it’s not venting properly.
- Faulty Safety Switch: A malfunctioning blade control or seat switch can kill the engine.
Engine Runs Rough or Lacks Power
This usually points to a fuel or air delivery issue after starting.
- Clean or replace the air filter.
- Check for water or debris in the fuel.
- Ensure the mower deck is clean and the blade is not damaged.
Essential Seasonal Maintenance For Easy Starting
Proper storage is the secret to a mower that starts on the first pull next season. Neglect is the main reason for hard starting.
End-Of-Season Storage (Winterization)
- Add Fuel Stabilizer: Run the engine for 5 minutes to circulate treated fuel through the carburetor. This prevents gum deposits.
- Change the Oil: Do this at the end of the season so corrosive acids don’t sit in the engine all winter.
- Remove the Battery: For electric start models, take the battery indoors and keep it on a trickle charger.
- Store in a Dry Place: Keep the mower in a shed or garage, protected from the elements.
Beginning-Of-Season Tune-Up
- Change the oil if you didn’t in the fall.
- Install a new spark plug.
- Replace the air filter.
- Sharpen or balance the mower blade.
- Check tire pressure.
FAQ: Frequently Asked Questions
Why does my Briggs and Stratton lawn mower have no spark?
The most common reasons are a disconnected or faulty spark plug, a damaged spark plug wire, or a sheared flywheel key (which happens if the blade hits a solid object). Check the plug first, then consult a service center.
How many times should I press the primer bulb?
For a cold start, press the primer bulb three times slowly until you see fuel filling the bulb. Do not over-prime, as this floods the engine. For a warm engine, one press or none is usually sufficient.
What is the correct starting procedure for an electric start Briggs and Stratton mower?
The procedure is identical to a manual start, except you turn an ignition key instead of pulling a cord. Always ensure the battery is fully charged. Engage the blade control, set the choke, then turn the key.
My mower only starts with starting fluid. What’s wrong?
This indicates a fuel delivery problem. The engine needs the extra vapor from the fluid to start. The likely culprits are old gas, a clogged carburetor jet, or a faulty fuel pump on larger engines. Avoid overusing starting fluid as it can damage the engine.
Should the throttle be on fast or slow to start?
For a cold start, always use the “Choke” position. Once running, move it to “Fast” to mow. Use “Slow” only for idling briefly. The correct throttle setting is critical for getting the right fuel mixture.
Following these steps will make starting your Briggs and Stratton lawn mower a quick and reliable task. Remember, consistency is key—always perform your pre-start checks and use fresh fuel. With basic annual maintenance, your mower should provide years of dependable service, starting easily season after season. If problems persist despite your troubleshooting, it may be time to consult a qualified small engine repair shop.