Craftsman

Craftsman lawn tractor all of a sudden when we were using it started to backfire and sputter, more so when it was under pressure. I was told that it could be fuel filter or pump. It is gavity feed (so no pump) fuel filter was very dirty replaced it and a fuel line. Same thing when I start it, it runs smooth for about 1/2 to 3/4 of a minute then starts backfiring and spitturing, if I idile it down it seems to help a little. What is the next thing to try?

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The primary cause of a backfire is decelerating too quickly. The simple fix for this is just to lower the engine speed a bit more gradually. If you have a throttle that you use to reduce speed, gradually let it up instead of letting it rebound quickly.
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.

Rich Air/Fuel Mixture

If too much fuel is added to the engine, it may not all burn up before the exhaust valves open — letting unburned gasoline into the red-hot exhaust headers, where it can combust and lead to a backfire.

Clogged or Dirty Air Filters

It is one of the most common problems that cause lawnmowers to sputter. The mowers take the air from the surrounding through air filters and mix it with fuel inside the engine. So, if the air filter is clogged or dirty, it will affect the flow of air into the carburetor.

The spark inside the chamber may not burn up all the fuel, allowing a little extra gasoline vapor to enter the exhaust, and lead to a backfire. This can be caused by a faulty mass airflow sensor or a clogged engine air filter “choking” the engine and not allowing enough oxygen to flow into it.
A worn, dirty, oily, or improperly gapped spark plug can cause a weak spark, and this can lead to a misfire. A quick way to check that the spark plug is functioning properly is to carefully remove the spark plug wire while the engine is running. If you hear a drop in the engine rpm, then the cylinder is fine.
There`s a variety of factors that can cause your car to backfire, but the most common ones are having a poor air to fuel ratio, a misfiring spark plug, or good old-fashioned bad timing.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

How do i install a mulching plug on my craftsman lawn tractor?
ANSWER : It covers the hole on the deck

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Can’t get front wheel back on lawn tractor
ANSWER : Grease your shaft and make sure you have no dirt on it, even dust can hinder getting it on right.

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Craftsman riding mower lt-1000 leaks gas – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : Need to fix that. it may be a fire hazard.

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Where I need a manual for this tractor….where can I download one?
ANSWER : Search internet with your model number and manual

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Craftsman 22hp lawn tractor when its hot i loose half the power and backfires on cold months it run fine …brigs and stratton engine
ANSWER : Not a expert just trying to help,, sounds like you have heat problem with the carb or the fuel line,,make sure all the heat sheids are there,, if not repllace them,,cause it will cause the gas to try to vapor lock. hope this help you

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Mower runs for about 5 min, than dies won’t restart . When cool start up ( craftsman 42 in deck 19.5 hp lawn tractor )
ANSWER : Check for spark when it dies you could have a bad coil

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I have problem with pulles an my craftsman 17 hp 42in
ANSWER : YOU MUST USE SEARS BELTS ! THERE A ODD SIZE

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What type of oil for 17.5 42 500 cc – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : I use straight 30wt.

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