Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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My lawnmower has started doing a gallop sort of thing where it revs and then slows instantly to then rev again. I have found that if I pull the choke lever about 20% or so the engine smooths right out. Another way to describe the symptom is that it sounds like a pressure washer does when you release the trigger and stop the water flow. I have taken the carb off and blew carb cleaner through the ports after removing the needle and seat. This made no difference to the way it runs. Can you please give me some advice as to what to do?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

redbeard00
  • 957 Answers

SOURCE: Craftsman GT5000 W/22hp B+S surges and dies when warm

Replace the spark-plug, check the quality of the fuel(gas that is mixed or was stored more then three months is stale and wont fire correctly) make sure the fuel and air filter not clogged. If there is no change then your problem may be more technical, a nest may be restricting the govenor or you missed something with the carb and there still is debre causing it to stall.

Posted on Apr 24, 2009

  • 201 Answers

SOURCE: Hello, I have a craftsman dyt 4000 with the Briggs

remove fuel bowl and check needle valve and float assembly

Posted on May 08, 2009

  • 376 Answers

SOURCE: not getting enough gas to the carb have to run choke 3/4 engaged

Sounds like a restriction in your carb, not getting enough gas. I would clean out the carb again.

Posted on May 23, 2009

  • 138 Answers

SOURCE: lawnmower shuts off after 15-20 mins of running

Sounds like a bad coil to me ... it only makes sense that has the heat from the engine transfers into the coil the coil windings expand and causes a open resulting in ignition failure and no spark to the plugs... if you need parts try www.partstree.com

Posted on Aug 21, 2009

  • 138 Answers

SOURCE: Craftsman LT1000 ridign mower engine dies after 15 min-deadman on

There are several things that could be going on, but what you said in your description about the dead man switch in the seat may need your attention first. The switch it self could also be bad. After you rule this out the next thing I would check is the fuel shut off solenoid located on the carb when you turn the key on to run you should hear a click and feel it in the solenoid. After this you may have a fuel pump issue or a coil issue. but from what you I have described I believethe first 2 itmes I mentioned should fix your problem

Posted on Oct 09, 2009

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My money is on a partial blockage of the main jet or the passageway to it. You're having to force it to run through the idle jet by fully choking the incoming air. There's not enough gas coming in with the choke open to allow it to run.

I'm thiniking total carb disassembly, carb cleaner and an air compressor combined with a ton of patience will take care of the issue.

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Choke is an adjustment to air intake to adjust fuel/air mixture and is heat related. Do not fully open choke as soon as it starts. Gradually open as the trimmer warms up. If a happy medium can not be found then fuel adjustments will be needed on carburetor.

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Ensure you have the correct Fuel / Oil mix for your machine first.

Find the choke knob and turn to the closed position.
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Pull start! (should take no more than 3-4 pulls before it fires)
Once it fires it may die instantly.... if so cancel the choke and pull start (should fire again on first pull)
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