Why are you screwing with it? Those haven't been around long enough for one to be out of warranty. Just take it down to your dealer and have him adjust it or put a new carb on it. If your using the echo oil switch to something else as it is reactive with some chemical that walbro uses in their machining processes. Problem first cropped up on the pb-250, but since it started my shop sells Shindaiwa oil to anyone with a walbro carb, no probs so far.
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