Problem With Stihl 031 Av

[AUSSIEJOHN]

Hi all
i have a stihl 031 av that i purchased for AUD $50.00
ihave just stripped it and put it back together, replacing pulse pipe, and putting a carby kit thru it.
the problem i am having is that when the saw has been running for a while.
reaches operating temp, it wont idle and starts to really bg down and finally stall.
then it is a real dog to get started again.
it has a good spark even when hot ,however i have not checked the compression as i dont have a tester.
can anyone shine some light on this as it is a nice saw and i am not ready to throw in the towel
thankyou

:rockn:

 

[Lakeside53]

Hi all
i have a stihl 031 av that i purchased for AUD $50.00
ihave just stripped it and put it back together, replacing pulse pipe, and putting a carby kit thru it.
the problem i am having is that when the saw has been running for a while.
reaches operating temp, it wont idle and starts to really bg down and finally stall.
then it is a real dog to get started again.
it has a good spark even when hot ,however i have not checked the compression as i dont have a tester.
can anyone shine some light on this as it is a nice saw and i am not ready to throw in the towel
thankyou

:rockn:

Probably just running a little too rich. Turn the L screw 1/8 turn (or less) clockwise.

I tune the L when the saw is hot for the very problem you have. It's a balance between the L mixture and LA screw.

I assume you set the metering lever height correctly when you put in the carb kit?

 

[1CallLandscape]

Probably just running a little too rich. Turn the L screw 1/8 turn (or less) clockwise.

I tune the L when the saw is hot for the very problem you have. It's a balance between the L mixture and LA screw.

I assume you set the metering lever height correctly when you put in the carb kit?

I agree with the carb adjustment theory. do you have the newer carb with the crappy needle adjuster or the older carb with a L & H adj???? also check the coil. i had a real problem with my 026 and the coil. it was doing exactly the same thing. do you have a spark tester??? if so run the saw up with it attached and carefully watch the spark pattern. stihl has lifetime warrantys on most of their saws ignition systems.

-mike

 

[AUSSIEJOHN]

thank you for the replies

the carby is the one with the H and L needles
a good question by lakeside regarding the metering level
that is something i didnt check
how do i set the correct level

 

[Dan Forsh]

Hi John,

I don't know if the procedure differs dependant on whether you have the Tillotson or Walbro carb. Check your e-mails, I've sent you the Tillotson service manual for the HU series carb. Walbro don't seem to be as forthcoming with the info. If you look at page 6 you will see the details on setting the lever.

Dan