My chainsaw won't run without full choke on and

SOURCE: Chainsaw will start and idle if choke is pulled

Let it warm up first ...

SOURCE: starts and then runs wide open.

SOUNDS LIKE THROTTLE NEEDLE STUCK OPEN CHECK THROTTLE LINKAGE STICKING OR RETURN SPRING

Mark T

• 776 Answers
• Posted on Mar 19, 2010

SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

The best thing you can do to these engines it take them completely apart - take piston out and everything. Believe it or not, my 12-year-old son was able to do it - very few parts in these little 2-stroke engines. He polished the carbon off of the piston with a drummel tool and cleaned everything with carb-cleaner. Put it back together and it ran like a champ. Still does. It was a great learning experience for him too. The worst that can happen is you have a bunch of parts that you will throw away.

SOURCE: chainsaw dies out when gas is pressed to full throtle

Carb needs teardown and cleaning. May be a stuck float or clogged jet.
Spraycleaner just wont cut it.

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SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!