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Thank you for your answer
@efr215 wrote:
the size of the cutaway on the slide that controls the mixture for the first 1/4 or so of the slide opening, if you have too small a cutaway then the mixture will be over rich which would explain the coughing.
I identified the coughing as the mixture beeing too weak
@efr215 wrote:
Having the needle in the top groove also seems a bit odd as that too will make for a rich mixture.
Sorry highest position means needle in bottom groove which makes a rich mixture at intermediate
@efr215 wrote:
Is the slide badly worn perchance?
No it is in very good shape
My feeling is that the mixture is ok in idle
too weak at intermediate between idle and accelaration (if I lift the throttle and keep the air lever a little bit down it works fine)
a little bit too rich at accelaration
and ok at full throttle
I read on another topic in this forum that 3-jet Binks carb is working fine on another Veteran Scott. But this is probably another unobtainium piece.