Yard King 21″ Push Lawn Mower w/ Briggs and Stratton Engine…

Acting like there is no gas in the tank but the tank is full
Experienced gardeners share their insights in answering this question :
Fuel line or filter could be clogged, the spark plug or wire could be bad, etc.

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Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start. For small engines, spark plugs typically need to be replaced every season or after 25 hours of use. You should also check to make sure the spark plug gap is set correctly.
If your Briggs & Stratton engine has a spark but won`t run, then it is most likely a problem with the gas or air intake in the engine. The spark on the spark plug ignites the gas in the piston, but if the air filter is clogged or the gas can`t flow, then the engine won`t start.
Your lawn mower turning over but not starting due to several reasons, such as a faulty or disconnected plug, a disconnected spark plug wire, a clogged air filter, or a contaminated fuel tank. A faulty carburetor, a dirty cutting deck, or a dysfunctional flywheel brake can also cause this.
A dirty carburetor is one of the most common causes for a lawn mower not being able to start after sitting unused for months or years at a time.
Use Carburetor Cleaner

Fortunately, you can generally do this without even taking the carburetor out of the engine. Start by purchasing some commercial lawnmower carburetor cleanerOpens a new window, which comes in a simple spray can and will make it easy to clean the inside and outside of the carb.

Some other typical reasons engines fail to start include:

Low or discharged battery. Corroded or loose battery cables. Starter motor relay failure. Ignition switch failure.

If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. Once you have confirmed that the stop switch is working, reconnect the spark plug lead. If your ignition start or push button start needs replacing, consult a Briggs & Stratton dealer near you.
The most common signs of bad spark plugs include start-up trouble, rough idling, sluggish acceleration, declining fuel economy, engine misfiring, and engine knocking.
A dirty carburetor is the most common cause of a lawn mower that starts and then dies. Other possible causes include: Stale/Dirty Gas. Faulty Choke.
Press the clutch pedal with the left foot (if the car is manual) Press the brake pedal with the right foot (automatic and manual cars) If the car has a key, turn the key to start the engine and let go as soon as the engine has started.
Your Mower Won`t Start:

Other possible causes include: Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas.

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The buying spree lacked strategic focus and ultimately failed to turn around the company`s decline. Rather than investing in research and innovation, Briggs` management tried to buy success while continuing to enrich its executives and stockholders.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Does not run, will start with starting fluid – Mantis 2-Cycle Tiller
ANSWER : You should never use starting fluid on this model.

Add a couple of ounces of 100% acetone (available at Walmart) to some fresh fuel. Attempt to start for several pulls. Let sit for several minutes and repeat until it sounds like it wants to run.

Then watch this video and do it:

http://www.alamia.us/mantis_parts_s/148.htm

Toro clear won't start – Toro Power Clear 621 R
ANSWER : Bad gas , plug ,air filter , no spark ck all need all 3 to start

Strimmer wont start plug very dry when i remove it?
ANSWER : Sounds like the gas is not getting to the cylinder—remove carb and disassemble–make sure all jets are clear and the float valve moves freely.

Why do I have hard time starting my ariens snowblower when cold?
ANSWER : Does it have a primer bulb been seeing a lot of the bulbs with cracks

Tines continue to work with out touching safety or throttle. they engage as soon as I start the engine.
ANSWER : Remove H (high) L (low) plastic caps to allow you to further adjust the flow and you will be going. H (red) further out about 11 threads exposed and L (low) about 8 exposed; adjusting the low side will stop the tines, but remove tines before making any adjustments, thanks

<!– from fixya rte –>Rj19lm plug gap for a 195cc 4cyl lawnboy – Lawn-Boy lawnboy" Mower Blade 21"
ANSWER : As a starting point in my shop i always use 0.30 in. For all my mowers

Mower won’t start. Toro mower..engine won’t turn over. Cleaned sparkplug…checked air filter..weather cool. Followed instructions for cold engine…prime witrh three pushes of the bulb..wnon’t even hint at a start..
ANSWER : Something everyone over looks is oil. Did you check the oil? You seemed to mention everything else but. If you have a low oil switch with low oil it will not start

My mantis tiller with a honda gx22 engine starts then shuts off after approx. 30 sec.
ANSWER : If your unit has a primer bulb, start your engine . When it starts to die push your primer, if the engine comes back to life you have a carb issue.