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Experienced gardeners share their insights in answering this question :
Clean the carb. the bole might have dirt or water in it

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
The most common cause of a mower that runs for thirty minutes and then dies is a faulty armature. A faulty gas cap is the second most likely cause.
A full gas tank and oil reservoir are the essential first steps when checking why the lawn mower won`t stay running, but the problem could also be a dirty filter, clogged carburetor, improper fuel mixture, or a dirty spark plug.
If your lawn mower starts, runs for a while, then dies, check the ignition coil, gas cap, and spark plug. One or more of these parts could be causing your problem. Follow our repair and symptom guide to help you fix this.
A Dirty Carburetor Can Cause a Lawnmower To Start Then Die

By far, the most common issue that causes a stalled motor is a dirty carburetor. The carburetor on your engine is the thing that draws in air and mixes it with the fuel.

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. If this doesn`t work, you might need a new fuel filter.
Condensation inside the gas tank is one culprit, but moisture can also enter the system through a loose or ill fitting gas cap. The best solution is to drain the mower`s gas tank and refill it with fresh gasoline. A clogged fuel filter can also cause a mower engine to die.
The spark plugs are worn or damaged

If you find that your lawnmower keeps dying, or keeps stalling while cutting grass, then inspect the spark plugs. Look for signs of damage or wear. Something as simple as a cracked porcelain insulator can mean an electrode has been damaged or burned away.

If it is difficult to start the ride-on mower, the most common reasons include: Old fuel; make sure to use fresh fuel, especially after winter storage. Spark plugs might be dirty or damaged. How to examine and replace a spark plug on your ride-on mower.
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.
What`s happening? This is a normal function of the seat safety switch. With the blades engaged, weight from the operator allows the seat safety switch to keep the engine running.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

I have had a poulan pro 550 series push mower for almost 1 year at the end of the season last year the mower would start briefly and then stop. i have cleaned out the air filter and that did not help.the mower started, i made one revolution around the yard 3/4th of the way the mower quit. I then primed the mower it started then quit and now it will not start at all. Does anyone have any suggestions of what to do. Thanks
ANSWER : There is a little spring that works the carburetor arm. If that popped off then the mower will not run.

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I have a troy bilt riding mower. I put a new battery in it last summer. This yr., my son left the key in on positon when he got done cutting the grass. Naturally it killed the battery, I jump started the mower and cut grass for 4 hrs., but the battery did not charge. What could the problem be?
ANSWER : It may not be charging due to a bad connection to the battery or to the generator on the engine. The generator on the engine may be going or has gone bad.I hope this helps.

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I have a craftman 42 in dual blade riding mower. It it cutting my grass unevenly. I have change the blades and bearing on the blade housing. please help.
ANSWER : Either the deck is uneven or one of the blades are upside down

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42 inch mower cuts uneven, what is the problem?
ANSWER : Several things here could be the problem. Check to see if mower deck is level, measure distance on both side on a level surface. Check tire’s for low air. If you’ve replace the mandrel’s lately, some have a left & right side & if not put back together properly this will cause uneven cutting

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Lawn mower cranck but wont start…
ANSWER : Since you already checked for spark and air I would drain all the fuel out of it and check that fuel for water. Over time some lawn mowers end up with contaminated fuel. You can see the water sitting on the bottom of the fuel if you let it stand for a bit in a small plastic bowl.

Be sure to empty and dry out you fuel can as well. Especially if the mower stopped running right after a refuel. Which is a good sign your gas can is contaminated too.

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My 300z riding lawn mower zero turn starts but stalls when mowing the grass, please tell me what it could be?
ANSWER : Dirty carb possibly or the governor has failed

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I have trouble starting a toro walk behind mower
ANSWER : All, I thought my carb was shot, so I replaced it. Still, start but no run (and had to use starting fluid). THEN!!! I noticed the spring to the “rev limiter” (just below and towards rear of carb) was not “tight”. The stupid bracket that holds the end of that spring had been bent down ~1/16″ and that caused all this heartache. CHECK YOUR REV LIMITER!!!

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Mower cranks and runs smooth until i try to engage blades or put mower in gear. it then stalls out
ANSWER : The seat switch is not making. You can start the mower but if you try to move it or cut, the switch is acting as if there is no operator present. Find it under the seat.

Gary

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