How To Change Spark Plug On Lawn Mower

How to check, clean and modify small engine spark plugs?

Learning how to check, make clean and alter a spark plug is a valuable function of your DIY education. Whether you're doing regular maintenance or troubleshooting why your backyard mower or small engine won't start, this 3-footstep guide will provide the resource y'all demand to go on your car running correct!

Checking Small-scale Engine Spark Plugs
How To Clean Fouled Spark Plugs
Changing Spark Plugs in Lawn Mowers, Snow Blowers & Equipment

Alert: Ever read the engine and equipment manual(s) earlier starting, operating, or servicing your engine or equipment to avoid personal injury or property damage. Come across an authorized dealer or contact Briggs & Stratton if yous are unsure of any procedure or accept additional questions. Find all Engine Condom Warnings

Check Change Clean Spark Plug by Briggs and Stratton

Checking Small-scale Engine Spark Plugs

The electrodes on a spark plug must be make clean and sharp to produce the powerful spark required for ignition. The more worn or dirty spark plugs are, the more than voltage - and the greater the tug on the rewind - required to produce an adequate spark.

If you haven't tuned your engine recently, your mower won't kickoff and/or you accept to tug repeatedly on the rewind to start the engine, a damaged spark plug may exist the culprit. These problems may also cause excessive fuel consumption, deposits on the cylinder head and oil dilution.

Luckily, spark plugs are ane of the easiest engine components to repair and an cheap one to supplant.

When To Check & Replace Spark Plugs

For standard lawn mower and small engine maintenance, you should cheque and/or replace spark plugs:

in one case a season
every 25 hours of apply
if your lawn mower our outdoor ability equipment won't outset

How To Check for a Fouled or Damaged Spark Plug

Step ane: Disconnect the spark plug atomic number 82. And so, clean the expanse around the spark plug to avert getting debris in the combustion chamber when you remove the plug.
Pace 2: Remove the spark plug using a spark plug socket.
Pace 3: Clean light deposits from the plug with a wire brush and spray-on plug cleaner. Become full cleaning instructions below.
Step 4: Audit the spark plug for very stubborn deposits, or for cracked porcelain or electrodes that take been burned away. If any of these atmospheric condition exists, supplant the spark plug.
Step five: Check the spark plug gap and adjust as necessary.
Step half dozen: If it seems in working order, replace the plug, taking care not to over-tighten (fifteen ft. lbs. MAXIMUM) and re-attach the spark plug lead.
Step 7: Start Your Engine

If the engine tries to turn over (even for a second) and dies, then you have spark. This would betoken the problem probably lies somewhere else (fuel, carburetor, valves, etc.). If the engine does not turn over at all, and so there may be a problem with your ignition arrangement. The first thing to do is change the spark plug.

>> Review the FAQ on troubleshooting ignition system problems to learn how a spark tester can identify problems with the ignition coil, switch, flywheel or other small engine par

How To Clean Fouled Spark Plugs

To safely make clean a spark plug, y'all should use a wire brush or spray-on plug cleaner specifically designed for this ignition office. You can as well utilize a sturdy knife to scrape off tough deposits.

Note: NEVER clean a spark plug with a shot equalizer or abrasives.

Changing Spark Plugs in Lawn Mowers, Snow Blowers & Equipment

If your spark plug doesn't pass the tests above, yous'll demand to replace it. This is one of the easiest steps in backyard mower or small engine maintenance.

For pre-season tune-ups and finish-of-season storage, consider a Briggs & Stratton small engine tune-up kit that includes everything you need, including parts (spark plug(southward), oil filter, air filter) and fluids (lawn mower oil, fuel stabilizer, etc) specific to your engine.

Find the right spark plug(s) & adjust gap settings.
Disconnect the plug pb and remove with a spark plug socket.
Replace with your new plug, taking intendance not to over-tighten (xv ft. lbs. MAXIMUM) and re-attach the spark plug lead.

Still have questions? Lookout man this piece of cake guide to change the spark plug or discover more tips for troubleshooting lawn mower engine problems, check out our full list of Frequently Asked Question on Repairing Small Engines or contact a Briggs & Stratton service dealer nearly you.