Hello,, my chainsaw trigger will not fully engage the carburetor, so I cannot use a moderate cutting speed for cutting. I have heard there is a spring, but I cannot figure out how to open the housing up,,..where the trigger assembly is. any suggestgions
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Re: POULAN TRIGGER PROBLEM
Remove the air cleaner which usually exposes the carburetor--operate the throttle (engine off) and watch what moves--likely wood chips blocking the action--less likely, a wire linkage got bent somehow, or there is sawdust in the trigger mechanism. From your description, this saw starts full-throttle at the get-go. Sort of dangerous!
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I assume you are referring to a pullen pro chain saw. If so, the cable that links from the trigger to the carburetor is stuck. This can happen due to trash and dirt stuck in the trigger area, or the carburetor needs cleaning. Or the cable or wire to the carburetor is bent. See if the connection between the trigger and carb moves freely when not running.
Ok, so there are 2 adjustment needles on the carburetor. A H and an L... If your saw is idling fine you won't have to worry about adjusting the L needle.
Your focus will be on the H... the high.
Firstly, if there is any plastic covers on the adjustment needles, remove them. Usually red and white in color... or just white. They serve no purpose(EPA regulations for California). Now adjustart in quarter turn increments.. turn the screw to the right until snug, now back it out 1 full turn. This is your starting point. While holding the trigger all the way in, turn the needle counter clockwise in quarter turn increments, use your ear to tell when you have peak performance.
If you can't hold it down cause it bogs out, just hold it in as much as you can while you turn the needle until you can fully depress the trigger all the way
The choke system is connected to the half throttle position, if you lift the throttle trigger the choke pull will automatically return, whilst trying to start do not lift the throttle trigger, the starting procedure is, pump the primer bulb as many times as it takes to 3/4 fill the bulb, pull the choke pull fully out, this will switch the saw on and engage the half throttle, crank the engine until it fires once, do not continue to pull,it will actually not run on full choke, if you do continue to crank with the choke fully out, you will very quickly flood the engine, now push the choke fully in, now crank the engine until it fires up, lift the throttle trigger once, this will dissengage the half throttle, and it should now come down to idle.
Check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. Turn the idle speed screw (T) CCW somewhat to prevent the chain from turning at idle. If the above doesn't allow the engine to run without the choke on, then remove the carburetor, clean the interior with spray carburetor cleaner and check the diaphragm in the lower chamber for flexibility with no holes or cracks. Hope this helps!
Open the carburetor area cover and remove the air cleaner so that you can observe the throttle arm and the idle speed screw which stops throttle movement to set idle speed. If the throttle arm doesn't come back completely to the screw, then likely, the throttle trigger is jammed with sawdust/dirt that prevents the throttle arm from returning. Disassemble the trigger assembly making notes of part placement as you go. You will usually find a plug of sawdust in the trigger mechanism. Recheck the throttle arm motion after putting the trigger back together. You may have to advance the idle speed screw several turns CW to be able to keep the engine running when the throttle works correctly. Idle speed should be set so that the engine continues to run, but the chain doesn't try to turn. Hope this helps!
Expose the carburetor and try pulling lightly on the throttle cable--if it won't pull, the trigger assembly is probably full of sawdust. In that case, remove the handle cover over the trigger (record the position of all parts before trying to take anything apart to clean). You should be able to see any blockage, clean it, and re-assemble it correctly. Check the trigger operation at the carburetor to make sure that it is traveling fully from idle to full speed. Hope this helps!
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!
Remove the air cleaner assembly to see the carburetor throttle mechanism and open the handle so that you can access the throttle trigger. There should be either a cable or wire connecting the trigger to the throttle arm on the carburetor. Try moving the trigger and see if it responds at the carburetor. Is the carburetor arm against the idle stop screw, wide open, or some where in between? There should be a spring at the throttle arm that returns the arm to the idle stop if the cable/wire is disconnected. The trigger mechanism may be jammed with sawdust to prevent movement. Hope this helps!