High is 7/8 ths of a turn out from lightly seated. Low would be 1-1/4 turn out. This is ball park settings. The saw should run but will need fine tuning. Be careful not to turn the H screw in to far and lean out the mixture and damage the motor.
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Use regular Stihl 2 cycle oil. You mix it 50:1.
http://lawnandgarden.owneriq.net/manuals/mfg/stihl/025.html
You can use the same flywheel but need to put in a complete solid state ignition set up. http://store.chainsawr.com/
How many cc in a Stihl chainsaw
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The Stihl 031AV chainsaw can typically handle a maximum bar length of 16 to 18 inches, depending on the type of wood being cut and the specific chain used. However, for optimal performance and to avoid excessive strain on the saw, it's generally recommended to stick to a 14 to 16-inch bar. Always consult the manufacturer's guidelines for specific recommendations and limitations.
turn in then 1 1/4 turns out on high and low factory settings hope this helps
Stihl make their own chainsaws
The Stihl 064AVE was introduced on 1986.
If it's an 066 go 1 turn out from seat for high and low. No 064 to my knowledge.
The Stihl 064 is a 84.9cc chainsaw.
A Stihl MS 290 Farm Boss chainsaw costs around $370. This is Stihl's most popular model of chainsaw. It weighs about 17.4 pounds and has 3.8 Horse Power.