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Follow this guide to check and replace your spark plugs. Clean or replace the air filter. Is the spark plug fouled? For small engines, spark plugs typically need to be replaced every season or after 25 hours of use.

How do I troubleshoot & repair common small engine problems?

If it is dirty, that can cause poor engine performance or starting problems. Add oil to the engine. If your valve spring is still working well, check the clearance.

For rebuilding your carburetor, follow these steps. Clean the fuel tank vent and screen. Engine Stalling, Surging or Running Rough When your engine starts and stalls, it is often due to standard maintenance problems.

Is the flywheel loose? You should also check that the spark plug gap is set properly. If the engine is emitting white or blue smoke, this means your engine is burning oil. Clean spark plugs where applicable Follow instructions for checking and changing spark plugs.


Troubleshooting small engine problems | Briggs & Stratton

Reference your repair manual, available for purchase. Are the breaker points faulty? Air-fuel compression is crucial to engines powering lawn mowers and outdoor power equipment.

Lawn Mower Oil – 18 Fl. Small Engine Problem Solving Tips. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage. If your spark plugs look good, problems with your ignition system can also be preventing a spark. Is the engine dirty? Find Your Operator’s Manual.

Maintenance How-To

Your oil needs to be changed every 25 hours of use or season. An improper spark plug gap could lead to engine knocking and poor performance. Is your carburetor clean?

Is the spark plug lead faulty? Stale fuel, dirt and debris are the most common cause of outdoor power equipment not starting properly. Is the fuel mixture too lean? The compressions system is made up of valves, piston, cylinders and rings that control how the air and fuel vapors move through the engine. This means your engine burning oil. Using fuel stabilizer will keep your gas from creating small engine problems.


Lawn Mower Maintenance & How-To | Briggs & Stratton

You can determine if your air-fuel mixture is off by checking the state of your carburetor. Install new parts as needed.

Troubleshoot Your Snow Blower: Find the proper carburetor settings and step-by-step directions for Carburetor Adjustment. When your engine starts and stalls, it is often due to standard maintenance problems. If you store equipment with untreated gas in the tank, it can lead to engine damage. Please refresh and try again.

Are any shrouds or cooling fins missing or broken? Is the spark plug faulty or gap incorrect? Your oil typically needs to be changed each season or after sttatton 25 hours of use Refer to our Checking and Changing Mower Oil FAQ for further assistance. The carburetor regulates how air and fuel move through the engine. Is your fuel fresh? Valves that stick or have leaks can cause an engine to stop running. Spark plugs typically need to be replaced every season or 25 hours of use.