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Re: chainsaw runs full speed, will not idle.
Expose the carburetor so that you can observe the action of the throttle lever on the carburetor. The trigger should move the lever from the idle adjust screw to full throttle stop. If no movement observed, remove the trigger assembly from the front handle (make notes as you remove the pieces) and clean the area of sawdust/dirt accumulation. Recheck the action after everything is re-assembled before starting the engine. If the idle speed is still excessive, then turn the idle speed screw several turns CCW until the chain stops turning. Try wiggling the carburetor body to see if it has come loose from the engine. Hope some of this helps!
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Apr 20, 2012 - Uploaded by Alec Ulm's Busted Knuckles
Homelite XL 2 Automatic Chainsaw ... free to shoot me a question or comment and I'll do my best to answer as accurately as I can . ... Homelite SUPER 2 Chainsaw OILER REPAIR & TEST RUN - Duration: ... HOW TO ADJUST A Homelite Carburetor - Duration: 5:01. by smallenginemaster1 177,482 views.
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Have you tried changing the gas you are using? Sometimes with the addition of ethanol, water condensation is attracted and builds up in the system, creating a fuel mix that affects performance. Also, make sure your settings for High speed throttle are correct. You may need to make a small adjustment on the screw marked H for running high throttle.
The H jet needle should be set so that the engine will 4-stroke at full speed, but immediately 2-stroke when cutting. The L jet needle should be set so that the engine will 'follow the throttle', but idle fairly well. Adjust the idle speed screw so that the chain stops turning, but the engine will continue to run. Check the fuel lines for condition and the fuel filter, air cleaner, and muffler for plugging. Make sure the carburetor fasteners are tight. Hope this helps!
If the fuel tank was completely full, I would expect fuel leakage from the tank vent--don't make a practice of overfilling. Give it a little breathing room for expansion. Check the air cleaner and muffler for plugging. White and red adjustments mean nothing to a color blind person. There should be an 'H' and 'L' cast into the plastic surface or on the carburetor body itself near the adjustments. Turn both screws CW to stops (lightly) and then back out each 1-1/2 turns CCW. Start the engine and allow to warm up. Pull the throttle full on, and adjust H CW until the engine starts to speed up but still 4-stroking. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L CW until the engine runs fairly well, but allows the engine to 'follow the throttle'. Set the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!
Make sure that the air cleaner is not choked with sawdust. Turn both H and L jet screws CW to stops (lightly) then back out each 1-1/2 turns CCW. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW so that the engine will speed-up somewhat, but still 4-stroking. Proper final adjustment is to be 4-stroking, but immediately 2-stroke when cutting. Allow to idle and adjust L so that the engine runs fairly smoothly, but will allow the engine to 'follow the throttle'. Set idle speed screw so that the chain doesn't move, but the engine keeps running. Hope this helps!
It is most likely the diaphragm needs replacing. This is the cheapest and easiest thing to try first. If this doesn't it may require a new carburator, or you may can rebuild the carburator with a kit. The kits are very inexpensive.
carb adjustment,hi circuit,bring it to max rpms then richen hi idle side til saw loses a small amount of rpm.This and a tad richer mix ratio will ensure a longer saw life.Use itasca as a chain oiler,never motor oil.
Should b 2 screws on side of carb. One is low speed adj and one is high speed adjust. Turn screws all the way in until they bottom, not too tight--turn them out 1 1/2 turns. Start saw and adjust the idle screw by turning in until it starts to sputter and turn out until is idles smooth same for hight speed only adjust at high speed