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.
http://store.chainsawr.com/
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
Check out the related link below for information.
turn in then 1 1/4 turns out on high and low factory settings hope this helps
Stihl make their own chainsaws
If it's an 066 go 1 turn out from seat for high and low. No 064 to my knowledge.
The Stihl 064AVE was introduced on 1986.
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.
2-stroke gas powered saw w/ electronic ignition. 16-24" bar typical, can take other bars. High torque, lower speed saw, circa 1970's to 1980's. Considered obselete for parts and repairs, but many are out there if you hunt for them Correction: later models had electronic but were so labeled, earlier 031av had points.