Question about Ariens 21 In Classic Walk Behind Push Lawn Mower ()

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Not starting model num 911311 ser num 000196. aries lawn mower, my problem is it wont start only on prime, it has a float but theres no choke, the pipe from the carb to the valve that carries the fuel was replaced as it was broken, it seems there is no suction to draw up the fuel apart from priming, carb was cleaned numerious times and fuel tank too, any help is appreciated tanks.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: how do I know if

Check air filter. Try to run without filter. If not, add gas through carb and see if she'll fire. If she does,
clean the jet

Posted on Dec 18, 2010

  • 14 Answers

SOURCE: Mower starts and immediately shuts off and wont

Pull the fuel line from the carb & see if it is running steady, If so the next check is the carb bowl to see if maybe the float needle is partly plugged, and then it could be the valve lash clearance which will require more mechanical knowledge.

Posted on Jul 15, 2011

hunter19_46m
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Hi
Sounds like you have dirt/debris in your caburetor inlet fuel needle valve, this will cause the float needle valve to stick open and allow fuel to run out of the carburetor unchecked untill you empty the fuel tank.
Sometimes you can tap on the carburetor lightly with a hammer and dislodge the dirt/debris from the needle valve.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
Make sure you are using fresh fuel.
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
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Posted on Aug 23, 2011

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