Mtd

Have put in new spark plug (plenty of spark); have installed new air filter, new fuel filter, and have just put in a new carburetor. Nothing fixes the problem. It starts perfectly each time and can run well from 30 seconds to a few minutes…but it always ends up spluttering and cutting out. Any other area we can look at which could be causing this problem?
Experienced gardeners share their insights in answering this question :
Check fuel lines for leaks. replace fuel filter.

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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.
If your lawn mower starts, runs briefly, then dies these are the four most common reasons that`s happening: Dirty carburetor / clogged carburetor bowl. Old gasoline that has gone bad. Dirty or defective spark plugs.
If the engine starts, but does not run smoothly, it means that the spark plug and ignition system are in order and you need to look elsewhere for the source of the problem. The usual culprit is air intake or fuel system related.
Carburetor Issues

If there`s too much air in the combination, the engine`s power degrades. And on the other hand, if there`s not enough air, the mower will consume too much fuel. So, when the carburetor cannot balance between the two, your mower might sputter and eventually die.

A dirty air filter inhibits the flow of air into the carburetor. Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine. A bad cap on the gas tank is the first place to look.
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.

Clogged or Dirty Air Filters

Dirty air filters are one of the most common reasons lawn mowers sputter. Dirt can be present in the apertures that lead from the carburetor and the fuel filter and interrupt the flow of fuel supply to the combustion chamber. You want to be sure to clean or replace dirty air filters.

Tractor may be starving for fuel.

Sometimes the fuel cap prevents the fuel tank from breathing. The fuel tank can develop a vacuum. This could cause fuel to stop running to the engine – causing it to stall. If this is the case, give it an hour or two, and the tank pressure will reset and equalize.

One of the most common causes of a sputtering engine is an issue with the vehicle`s fuel system—the filter, pump, and injectors. These three critical components work together to ensure fuel flows smoothly from the fuel tank to your engine`s fuel injectors, and then pumps into the engine evenly.
The common causes for rough running in an engine are: Engine miss. Vacuum leak. Dirty fuel injectors.
If the engine runs rough after hitting a rock or stump, check the flywheel key-a damaged flywheel key will disrupt the ignition timing. Check for fuel, oil or carbon deposits on the spark plug. Replace the spark plug if it`s fouled. Bad fuel causes a rough-running engine.

Discover Relevant Questions and Answers for Your Specific Issue

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Remove deck from 2007 yardman 46 inch cut – Mtd LAWN MOWER PART # 983-04162A-0638 DECK Assembly:SD 42" W
ANSWER : Contact MTD if your manual doesn’t cover this, or buy a shop manual.

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MTD Yardman push mower runs fine for awhile then cuts off.
ANSWER : Try buying a new plug first but if it continues then I would say that there is debris in the carb.

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ANSWER : Go to MTD website and download the manual for your machine.

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ANSWER : G to Amazon.com on line mtd replacement bag for bagger

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ANSWER : Try sears parts online

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Starts and runs for a little while. and then stop running?
ANSWER : Will it start again after , like, 20 minutes? Try starting it with the gas cap lose. see if that helps

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New mtd yardman 550 series wont start – Mtd 22" Yard Machine Push Mower
ANSWER : Take it back where you bought it.
They should repair or replace it for you.

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Belt drive How do I get to the belt for my rwd? I can see it, but what do I take off to get it under the clips, etc?
ANSWER : If you post the model # it would be helpful. You can often times find the engineering drawings at partstree.com/parts. YardMand is actually made by MTD so you would have to look in that category under walk behind mowers.

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