Could it be that the fuel line is restricted? Also may check that the breather in the tank cap is free (think it would run longer than a few seconds if this was the case, but you never know).

Good Luck,

Dave

Thats the limiter caps keeping the screws from turning, I think you could buy a remover from Stihl. You need to get the adjusting screw out and clean the passages under them, thats where it will be blocked up and they won't come clean by soaking. Use Stabil, don't use ethonal. Steve

Sounds to me like a clogged fuel filter, replace it and you should be in business.

im getting plenty of fuel so its not the filter i'll buy the cap limiter tool and see if the passages are blocked any idea on how to adjust the ihgh and low sides

Turn both out 1-1/4 turns to start,(wait untill it's warmed up a little) then turn the low adjuster in 1/8 of a turn in at a time untill it trys to stall when you crack the throttle then back out untill it accelerates good. Turn at high in a little at a time untill it really screams at full throttle then back out untill is starts to slow down a little at full throttle. On most saws you'll end up around 1 turn open on the low and 7/8 to 1 turn on the high. Steve

You said the saw starts but runs only for 5 seconds.Also that you are getting plenty of fuel.
Do you mean to say its flooding? If the answer is yes, check the metering chamber(remove the top cover held with 4 screws)
You might have a stuck metering valve.Keep the metering lever presses and try blowing some carb cleaner through the fuel inlet (the upper brass tube)
You can check if the metering valve is working by putting the carb back without the top cover.
Remove the spark plug.Make sure the switch is off.
Press the metering lever and crank the starter a few times.
Fuel should come out through the inlet(metering) valve.
Release the metering lever and crank again.If your inlet valve works no fuel should be pumped up.
If all this happens, your carb's pumping and metering are working.
The other thing to check is the valve jet.
This is the bit of brass sticking down in the middle of the barrel.
To check if this jet is working, you will have to risk getting some gasoline in your mouth.No other way doing it.
With the metering cover removed, the H screw turned out to its stop, the L screw turned into its stop, close the throttle end of the carb with the palm of one hand.Put your mouth over the choke end and blow in and out several times.
When blowing in you should feel air coming in through a restricted passage.When you blow out you should feel a valve closing and stopping the passage of air.If you do not feel the valve closing and if air blows in and out as you blow, the valve jet is stuck.This could be caused by gummed up fuel.You could try cleaning it out with a cleaner spray, but chances are not high,so it might require a replacement.
Regarding the H and L screw. Start your saw with both of them turned out to their stops.
Once the saw is running,turn in the idle screw (LA) till you get the saw to idle without your hand on the throttle.
Turn in the L screw till the speed of the idle starts increasing.Turn the L screw in a bit more from this point.
Back off the LA screw till you get a smooth idle.
To set the H screw, with the bar and chain fitted and the screw driver in the slot of the H screw, depress the throttle fully.Turn in the H screw till the saw stops four stroking,turn it out slowly to the point it just starts four stroking.

Good Luck.
Joe

Hi

Had the same problem with my 026. The p/u line in the gas tank had gone 'soft' and was collapsing starving engine of gas.

John