Author Topic: Stihl 031av  (Read 149 times)

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Offline geoday69

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Stihl 031av
« on: November 19, 2014, 11:41:52 am »
I have been working on an 031av. I have installed new carb kit, checked fuel line,changed plug, checked impulse line, has 140lb. psi. Saw will run great for 8-10 cuts thru a 24in. oak then suddenly quits and will not start for 15-20min. Then runs great for about the same time. I suspect coil or condensor. Cannot buy new coil anymore and a new condenser is iffy @ best. Any ideas? 

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Offline 660magnum

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Re: Stihl 031av
« Reply #1 on: November 19, 2014, 12:51:05 pm »
There's been a guy using modern day epoxy capacitors in them. I had a 031 for a few years. I noticed that he bought up all the supply of the capacitors from Digikey and you could only get them from him. He was friendly and cheap enough. It actually was a good thing for he would sell you one capacitor at a good price whereas the original source had a minimum transaction price. Only thing is I cannot remember his name but you will come across him if you keep searching for 031 not starting or running.
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Offline geoday69

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Re: Stihl 031av
« Reply #2 on: November 19, 2014, 03:29:05 pm »
Thanks--is there any way to check a coil?

Offline 660magnum

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Re: Stihl 031av
« Reply #3 on: November 19, 2014, 06:15:03 pm »
The layman can check the continuity of the primary and secondary of the coil as well as isolation between between the primary and secondary.

There is a reasonable measure of electrical resistance of both the primary and secondary windings. For example the primary should be one or two ohms and the secondary should be more than a thousand ohms resistance - typically 6-8K.

That being said, the typical problem with the Stihl 031 early points type ignition failure is the condenser and not the points or the coil.   
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Offline 660magnum

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Offline 660magnum

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Re: Stihl 031av
« Reply #5 on: November 19, 2014, 06:44:56 pm »
Coil to flywheel clearance is a business card or about .010"

Points are .016"
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Offline geoday69

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Re: Stihl 031av
« Reply #6 on: November 20, 2014, 11:19:35 am »
I think I will try the condenser you linked to. That will eliminate the condenser for not a lot of cash--thanks:)
 

 

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