Poulan PVB200 starts fine but will not run full speed. Can put choke on 1/2 way to increase rpm, but still will not run full speed. 2yrs old

Hi Jason:
Make and model might help but here's two ideas:
1) Remove muffler and clean it. They can get plugged up with carbon and the saw will run at low RPM but will quit because of excess back pressure when you try to rev it up.
2) Set the high and low speed carb settings. Start the saw then gradually increase engine speed until full throttle. Screw the hi-speed needle in slowly. If RPM immediately drops, back it out until Rpm increases, then starts to drop. Screw back in until peak rpm reached, then starts to drop. Back out to peak, then 1/3 turn more.
Set low speed so engine runs smoothly but chain does not turn.
Hope this helps.

Hi John:
Sounds like it's too lean.
Try backing out the high speed screw 1/2 turn at a time until you don't need the choke. Then tune the high speed with saw running at full throttle. Screw in (lean) until RPM starts to drop, then back out 1/3 to 1/2 turn. Then set low speed at idle so engine is smooth but chain does not turn.

Back the carb screw out 1/4 of a turn.

The choke actually just opens the throttle bodies a little (the bike is fuel injected). Try using putting on the 'choke', then pressing the start button, but dont touch the throttle. Does it start ok? Also, when started, if you use the 'choke' does it increase the engine speed? If it does not, then you need to set it up correctly.
Let us know how you get on.

After you start it and are in the second stage of the choke (half choke ) let it run for awhile until it warms a bit then try openning choke and going to full throttle.

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!

Sounds like you will need to clean your carburetor, or rebuild it. Could be some debris in the jets of the carburetor. If the blower is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit, because the diaphragm will get hard and that will cause it to be hard to crank and not run at full speed. Hint: When you clean your carburetor and remove the jet screws, count the number of turns it takes to seat the jets from their original position. That way when you go to put the jets back in, you know how many turns they were in/out. Please rate me, Thanks Good Luck, I hope this helped

The unit is lean. rebuild the carb with a carb kit and check your fuel lines. If they are brown or discolored or brittle they need to be replaced. carb kits run approx. 11 - 18 dollars from your local dealer.

See if there's a plastic adjustment/tiny little unit with standard slot,try half turn.

no compression wont start