Small Engines (Lawn Mowers, etc.): mac110 chainsaw, speed one, walbro

Question
mt chainsaw has a new pug and has fire however when trying to start it will fire and then die in a second i am assuming that the previous owner tinkered with the carb. there are three screws for adjustment. how and where should i set them

thank you for any help!
mark

Answer
One screw is high speed, one screw is low speed and one is idle.

The idle screw is what is used for a throttle stop so the saw will idle without dyeing or the chin turning.

High and low speed screws are different.  GENTLY seat the screws. Open both 1 1/2 turns to start.  If that dosen't work open the high speed screw more.  

If the previous owner over tightened the screws he may have damaged the seats and screws.  I think that is a Walbro carb.  Go to their web site with the numbers on the carb for more detailed instructions and part numbers.  To get at the carb you may have to completely dissemble the saw.  Good luck.