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OK, got this old Echo 330 T. It starts, runs fine on low speed. Now, when it's time to cut and you pull the trigger, it dies. I have tried to feather it, adjust the high side in all directions, and still can't get it to go to stay running at high speed. I did have it working the other day after feathering the throttle. Sounds like it might be time for a rebuild, or a new carb. Pretty easy to rip out the carb on this model. I guess this saw is somewhere around 12 - 15 years old.

Come to think of it, it has not been running great for a while, as in 6 mos. At wide open throttle speed fluctuates up and down a lot. Thanks for any opinions y'all may have.
 

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On engines that old, sometimes the problem isn’t actually the carb, but the carb gaskets start leaking air through making the mixture way to lean.


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Also, check that the muffler screen isn't clogged. It will idle fine but will bog on throttle up.
 

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Also check your fuel lines... sounds like it might be sucking air. If they've never been replaced they're well past their due date.
 

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Air leak.

Do not run until a vacuum test is done or you'll burn it down.:tango_face_sad:
 

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