I have a poulan3700 and it will not keep running when you give it gas and the choke pushed in(open). When the choke is in mid position, the saw runs great. I just had the carb rebuilt, a new gas filter and a new plug. Puzzled now. I even pulled out the manual and reset the idle, Hi and lo needles but nothing. Could it be a leaking gas line?
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Clean the muffler spark arrestor screen and check the cylinder port for carbon build-up at the upper edge. Try presetting both carburetor H and L adjustments (from lightly CW stops) 1-1/2 turns CCW each. Start the engine and allow to warm up. Pull the throttle wide open and adjust H CW until the engine speed increases, but still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow to idle and adjust L for smoother running, yet allows the engine to 'follow the throttle'. Set idle speed to keep the engine running, but doesn't try to move the chain. You may have to look closer at your carburetor if the above doesn't help. Go to: http://www.drystacked.com for an excellent article (but poor pix) on Walbro carburetors, but related to most all 2-stroke carburetors. Hope this helps!
if theres nothing wrong with it you should close the choke between half and quarter (depends on the engine) and gently rev the engine bit by bit till it warms up, you will find the revs increase with gas to a point but if you give it any more gas it will start to stall and cut out, you have to wait for it to warm up - by keeping the gas at the sweet spot where you get best revs without it cutting out - then slowly increase gas pressure as the engine warms up - you can press it a little bit more bit by bit as the engine warms up and the combustion gets better - eventually you will be able to press the gas fully kin and the engine will just run but sound bogged down or gasping for air - this is when to open the choke to the RUN position (or fully open) --- it's now ready to use.
To restart a hot engine when it's been stopped :
1 Prime the engine - 3 squirts -
(you wont flood it - plus it lubricates the top of the cylinder with fresh 2 stroke and is good for the engine)
2 Hold gas a quarter way open
3 Pull cord!
as soon as it fires give it an extra squeeze of gas to give the best chance of a clean start.