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Engine starts but quits running after a few seconds
Experienced gardeners share their insights in answering this question :
Clogged carb need to rebuld it maybe needle and seat bad

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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. Contrary to what the movies might make you think, gasoline itself is not very flammable.

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.
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.
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.

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.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Engineer starts, and stop – Mtd 22" Yard Machine Push Mower
ANSWER : Clean fuel system
lines
tank
carburetor main jet, float bowl
check cable/linkage adjustments

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Battery the battery is dying and it will start but, after a few mins the engine starts to sputter then goes back to idle and eventually dies. could this just be the dead battery? is that the reason the engine dies?
ANSWER : Usually, if the battery is dying, it won’t start up again.
Usually, motorized vehicles only use the battery to start the engine, then the alternator contributes all the power for actual operation.
A dead alternator or battery shouldn’t ‘sputter’, they would just stop dead.

If the engine will start, run and then sputter…there is a fuel problem.
1. There may be a ‘cut-off’ in the fuel line which is in the off postion. It may look like a thin, flat wing-nut.
2. The gas may be contaminated with water residue if the gasoline has been sitting a long time. I believe you can get some water treatment to fix this without having to dump the fuel tank contents.
3. The fuel line is blocked with dirt somewhere, I would check the fuel filter and work backwards from there.

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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.

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While running blower starts dying down in power going up and bown and cuts off
ANSWER : I wonder if it is starting to seize. Have you been using cheap ethanol gas. Or have you done research online for gas stations that sell real gas? If you don’t use real gas on a 2 stroke engine it will over heat and eventually burn the valve and cause distortion all over. It will eventually seize.http://pure-gas.org/

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Starts, runs, and dies…starts, runs and dies…starts, runs, an
ANSWER : Sounds like a common fuel problem you need to remove carb & fuel tank and unless you can get a compressor they need a good blast out you may even take carb apart & check diaghram they have very small jets in fact most lawnmower shops have a sonic bath for this

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I have a Pouan Pro. I can start it but then when I give it gas it seems to have no power. It doesn’t die, just gets no power. Occasionally it revs.
ANSWER : It may well be running too rich because the air filter is blocked, remove the filter and just try the revs again free running, if ok, clean/replace the filter.

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Starts then dies – Ryobi 30cc 17" String Trimmer Zrry30530 Wcurve Shaft
ANSWER : Have a look at these 2 tips:http://www.fixya.com/support/r9230929-weed_eater_strimmer_will_not_starthttp://www.fixya.com/support/r9762653-strimmer_lawn_edger_trimmer_run

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My 23 hp Kawasaki engine runs until it get warm, it will then stall and is hard to start after that. It seems to me as if something is cutting the fuel off, What could it be?
ANSWER : When it begins to stall, loosen the gas cap. If performance improves, clear the gas cap vent holes.

Gary

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