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Stihl 031AV

Spiderman

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Hi, I've got a Stihl 031 AV that won't fire unless I spray carburetor cleaner in the carburetor. So I replace the carburetor and I replaced a few lines fuel filter and it still does the same thing. I am at a loss to try and fix this. I'd appreciate any help you could give me and thank you very very much in advance for your help
 

heimannm

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There is a dedicated Stihl thread in the chainsaw forum, you will likely get more response there.


Don't use carburetor cleaner, there is no lubrication and continued use will lead to damage. If you have to prime it to get it to run use mixed fuel.

Mark
 

gorilla

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Your saw has a spark, it fires, dont use easy start, check or blow out your fuel pick-up line and fuel filter.
 

Coupe

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Lot of things that could be causing that. First thing as Mark has said don't use carb cleaner if it will not
fire with your standard fuel mix theres a problem. You have not said in your thread if you have spark.
Three things a 2 stroke need is spark, fuel and air with out that there is not much chance. Check for spark
if you already haven't and if there is not pull a wure of the switch and see then if there is spark.
If so it should fire. Take the direct root with priming and take the plug out and straight in the hole.
To me it sounds like a spark problem. I am a wee bit at a loss with your thread is it firing when you
spray the carb cleaner in or not at all. If so was the carby new or secondhand or what. If secondhand there
maybe a need for a rebuild on that as well. As I most always put in my threads pull the fuel line out
of the tank pull the filter of the end and if you have a Mityvac 8500 pressure tester plug it
straight in where the filter was. Put 5 pounds or so of pressure in and it should hold that pressure.
If not you either have a leak somewhere in your carb. By doing it that way also checks your fuel lines
which should be okay as you have replaced but you never know.
But as a lot of these guys on OPE will also tell you there is a lot of things that will cause a 2 stroke to not
want to run.
Good luck and and will be a bit of trial and error, just try to eliminate things one by one and sooner or later
the problem should pop up.
 

Spiderman

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I put my spark tester between the wire and the plug it glows bright red. I put my pressure tester on the line out of the tank when I took out the filter and it has held 5 psi for 15 minutes. It still doesn't start. I will put fuel in a little squeeze bottle from now on to prime it with instead of carb cleaner.
Thank you for all your help.
 
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