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I installed a new carb on this mower and it runs great, but just on full throttle. if you try to put it on low idle it misfires and sputters and eventually dies. Any help?

13AC26JD058

I know it's a new carb but sounds like it has a port that may be dirty , your tank might have trash in it

mechanic mark said:

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thanks but i’m not looking for parts tho

semimechanicman said:

I installed a new carb on this mower and it runs great, but just on full throttle. if you try to put it on low idle it misfires and sputters and eventually dies. Any help?

13AC26JD058

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Why did you install a new carburetor? Did you keep OEM carburetor? Sounds like pilot jet is partially blocked or too lean on new carburetor. It isn’t always a 100% match on aftermarket carburetor installed on a small 4-stroke engine.

Tiger Small Engine said:

Why did you install a new carburetor? Did you keep OEM carburetor? Sounds like pilot jet is partially blocked or too lean on new carburetor. It isn’t always a 100% match on aftermarket carburetor installed on a small 4-stroke engine.

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i put it on because old carb only ran with choke on

You should be running full throttle all the time. As in all the time. No reason to idle down a mower engine. Full revs for max cooling and lubrication. Also cuts and vacuums better.

slomo said:

You should be running full throttle all the time. As in all the time. No reason to idle down a mower engine. Full revs for max cooling and lubrication. Also cuts and vacuums better.

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maybe but i plan on selling it and it shouldn’t be doing that anyways

Put up a pic or two of your carb, so we know what you have.

If you didn’t replace with an OEM carb, there is a definite possibility that the new one is jetted wrong for you engine application.

Most replacement carbs are jetted too lean. 2 options:
1) Replace the main jet with the one from the old carb.
2) Drill out the main jet with the next size larger drill. If it still doesn't run correctly go up one more size.

As a retired instructor and tech I say, PLEASE DO NOT TRY TO DRILL OUT A JET. unless you have the proper number drills, plus knowledge on how to do properly.

semimechanicman said:

maybe but i plan on selling it and it shouldn’t be doing that anyways

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Didn't pickup on a word I typed out. Good luck with it sir.

Rivets said:

If you didn’t replace with an OEM carb, there is a definite possibility that the new one is jetted wrong for you engine application.

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Seems like no one wants to hear the answer/s pose a question and disregard feedback totally

Disassemble the old carb. Clean every opening with spray carb cleaner. It should work

Rivets said:

As a retired instructor and tech I say, PLEASE DO NOT TRY TO DRILL OUT A JET. unless you have the proper number drills, plus knowledge on how to do properly.

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Obviously.....

If you bought a cheap aftermarket carb, I would suggest disassembling the original and cleaning it well. Cheap carbs do not run well.

I agree with dirt in the gas tank that got sucked into the carb. If there is dirt in the tank you need to clean it, then take off the carb and clean the jets with spray carb cleaner. Wear goggles, when you spray into a jet hole it can come out aimed at your face. Carb cleaner in the eyes is not good.