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if your saying your saw runs full speed as soon as it starts , one of two things is happening :
(1) your low speed carb jet is too far open
(2) your throttle trigger has disconnected or become stuck from your carburetor and now the throttle blade inside carb is full open
generally when you have a problem at wide open throttle it is a sign of the unit not getting enough fuel. It can be either a simple carburetor adjustment on the high speed side or a kit in the carburetor to replace a stiff or stiffening diaphragm
I will share with you the most common problem experienced with the model 330 with that type of symptom. Due to the anti-vibe system design of this saw, the carburetor is connected to the cylinder by a rubber "boot". Should this boot become damaged it creates an air leak and will cause the saw to overspeed and generally not run well at all. While there are other causes of this symptom, too many to list here, this is the most common with that model. Hope this gets you in the right direction.
Before adjusting anything, check the fuel filter, air filter, and muffler for plugging. Check the condition of the fuel lines for decay or other damage. Tighten all carburetor fasteners. Make sure you have fresh fuel mix in the tank. Does the primer bulb pull fresh fuel into itself when pumped? Turn both jet screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and should allow the engine to start and run. Start the engine and allow it to warm up, then pull the throttle full on. Adjust H needle CW until the engine starts to speed up, but still 4-stroking. Proper final adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for fairly good idle, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!
im no pro but id start with the throttle stop adjustment and the low speed jet.
screw low jet in, till its fully seated, do not force it. then back it out 1 and 1 / 8 turns. this should get it running and ideling.
close to the carb you will find two tiny screws. They are labeled H and L. L sets the idle speed. H sets the max RPM. Hold the throttle wide open and turn the H screw. When you find the very top end, back it down some or it will be running too lean. That would make it run hot, and provides less lubrication. Could result in engine failure if you run it too lean.
There is a recall on the UT models, all you have to do is call the costumer service center for homelite. they will give you a number for the closest warrenty center that will adjust you throttle cable free of charge. I went through two UT 10520's before i started researching the problem.