Gotcha, the needles are definitely two of each N7SB and N7SA and don’t appear to have any plugs/reducers in the main air jets. I tried running 4x N7SB needles(supposed to only be on outside) but it was causing it to have a bad rich spot around 7-9k, so i went with the two leaner needles again.When you have your carbs open, please measure some diameters of the needles.
I don't have the U49 spec needles in Europe available. Only N7RA etc. - would be nice to know the difference.
Would expect some leaner running needles.
Tip diameter and straight part diameter (may the position when the tapered starts).
Topham said they used 4x N7RA and blocked main air pilot fo open boxes etc.
I will test it and post some updates when possible.