Question about Husqvarna Lawn Tractor  25 HP 54in Deck Model YTH2454

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Engine wont run unless choke is almost closed and will die when you open choke up into normal position

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Its a lean fuel conditoin. Probably something in the carb. Also check flow from the tank and the intake mounting screws.

Posted on Oct 25, 2012

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My hmc green machine 3000ss weed wacker carb needs adjusting it only runs with choke closed


Try cleaning or changing the air filter. If it dirty the engine will not stay running with out the choke on.

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Choke problem


Replace the chock thermostat. When the engine is cold, the choke is in closed position to restrict airflow and give rich fuel mixture to combustion chamber. As engine area warms up, the choke thermostat gradually opens air passage to increase air flow to combustion chamber, resulting in leaner fuel mixture. The choke is in "full open" while the engine is cold, resulting in lean mixture, causing the engine to die unless you add more throttle to increase fuel mixture.

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I have cleaned the gas tank, fuel lines and rebuilt the carb. It now runs but just at idle almost in the choke position. I have played with the throttle and it wants to die when I move it to normal ru


if it runs only in choke it sounds like its lean (choke reduces airflow and gets back to a mixture it will run on.....just). It could just be a small bit of crud in the carby jet. You cleaned the fuel system.....did you install or replace a fuel filter? sometimes cleaning the tank and lines stirs up stuff that needs to be filtered.....even though you may had cleaned and rinsed out a lot.

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Qualcast petrol 35s mower will only operate with choke fully open, closing the choke causes the engine to cut out. Mower has been operating fine until now following a full service. What is the likely...


The chole is only ment to be used to prime the engine on cold start up, the engine is supposed to be run with the choke in the normally open position.

Aug 10, 2010 | Garden

1 Answer

What is the normal position of choke?


The choke butterfly should be open so that it doesn't close the carburettor. If the choke is closed the engine will idle very fast or you will not be able to accelerate properly. Move the choke in the other direction and if it runs porperly then the choke is off. Running with the choke on will destroy your fuel consumption.

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My troybuilt yard pony riding lawnmower will start with the choke fully open and then dies immediatly when you take the choke off. It will only start and run with the choke fully open, but dies after 20-30...


Do you mean that you can start it normally using the choke (that would be choke CLOSED), but then it dies immediately when you move it to run (that would be choke OPEN)? And if you leave the choke in the starting position that it dies after 20-30 seconds?----- If I have that all right, then you definitely have a restriction in the gas supply. Drain all of the gas from the mower and don't use any old gas. If you have any more old gas (from last season) don't use it. If this mower has a gas filter, replace it. Put just a little fresh gas in the tank plus a little of the cleaner. Start it up, do that a few times if needed. Use a fuel additive such as Sea Foam to keep the gas from gumming up so fast.

Mar 15, 2010 | Troy-Bilt Garden

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