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Always read the engine and equipment manual s before starting, operating, or servicing your engine or equipment to avoid personal strratton or property damage. Find all Engine Safety Warnings.

How do I troubleshoot & repair common small engine problems?

Do you have fresh, clean fuel in the tank? Stale fuel, dirt and debris are the most common cause of outdoor power equipment strattkn starting properly. If you store equipment with untreated gas in the tank, it can lead to engine damage.

Using fuel stabilizer will keep your gas from creating small engine problems. If it is dirty, that can cause poor engine performance or starting problems. Spark plugs typically need to be replaced every season or 25 hours of use.

You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty enngine plug lead, shorted kill switch or flywheel key damage. Air-fuel compression is crucial to engines powering lawn mowers and outdoor power equipment.

The compressions system is made up of valves, piston, cylinders and rings that control how the air and fuel vapors repir through the engine.


Valves let air in the intake valve and out the exhaust valvepistons move back and forth pushing the air-fuel mixture to the ignition system and the piston rings keep it all sealed up tight. You can perform a compression system with a leak down tester. When your engine repaid and stalls, it is often due to standard maintenance problems. Prevent stalling problems before they start with a tune-up kit.

Troubleshooting small engine problems | Briggs & Stratton

Is your fuel fresh? Stale, untreated gas begins to break down after about a month.

Drain the gas from your lawn mower our outdoor power equipment, then replace with fresh gas and fuel stabilizer to extend the life of your fuel. Clean or replace the air filter. Is the spark plug fouled? Clean spark plugs where applicable Follow instructions for checking engihe changing spark plugs.

Is your oil fresh? Check your oil level and appearance every time you use your engine while it is cold.

Your oil needs to be changed every 25 hours of use or season. See Checking and Changing Mower Oil. This means your engine burning oil.

Is the engine emitting black smoke? You need to perform a Carburetor Adjustment. Is the engine dirty? Is the oil level low?

Add oil to the engine. Are any shrouds or cooling fins missing or broken? Install new parts as needed. Reference your repair manual, available for purchase.

Maintenance How-To

Is the fuel mixture too lean? You can determine if your air-fuel mixture is off by checking the state of your carburetor. Is there a leaky gasket? This is another common carburetor problem associated with overheating engines. Is sratton fuel tank vent or fuel tank screen plugged? Clean the fuel tank vent and screen. Does the combustion chamber contain excess carbon? Carbon strattton can form on your combustion chamber.


If you see any, simply clean carbon from the piston and head see Removing Engine Carbon Deposits. Is the flywheel loose?

Lawn Mower Maintenance & How-To | Briggs & Stratton

Is the spark plug lead faulty? Test the lead with a spark tester, then test the engine see Servicing Spark Plugs.

Is the spark plug faulty or gap incorrect? Are enginw breaker points faulty? If they are faulty, install a solid-state ignition see Troubleshooting Ignition Problems. Are your carburetor settings correct?

Find the proper carburetor settings and step-by-step directions for Carburetor Adjustment. Is the valve clearance set briygs If your valve spring is still working well, check the clearance. Valves that stick or have leaks can cause an engine to stop running.

Learn how to properly and safely use, troubleshoot, and maintain your lawn mower, tractor, snow blower, and other lawn and garden equipment. Small Engine Runs Poorly. Engine Stalling, Surging or Running Rough When your engine starts and stalls, it is often due to standard maintenance problems. Is the valve spring weak? Check that the valve spring still has tension.

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