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A leaking plug could be a possibility. I put on a used carb that I had no previous experience with. Thanks.

Al, just to see, today I sawed an old carb in half through the high speed screw hole to see how the high speed needle seats. As per my guess, the small tip is supposed to block the jet passage when closed, but the fit is less than precision, so there is still fuel moving through. Obviously...

Seems to be working as designed, Al, opening up the screw gives more rich and gurgling sound as you would expect. Closing it gets the revs up, but just not quite enough to where you want it, still a bit too much of the gurgling. I interpret that the high speed still passes a bit of fuel when...

Taking that idea under advisement, it keeps getting spit out of the know it all machine without even an answer. :lol:

Al, do you have any idea how I might get a better closing fit on a high speed needle when screwing it all the way in? After putting a larger carb on a modded saw, it performs well, but the high speed needle has to be screwed all the way in to get the sweet spot, and it still isn't exactly there...