Zup, motorman7, I looked into my notes (old receipt) [over 10 years ago] at what jet needles I got as a SU replacement. But, I don't think it is quite as straightforward, as the North American market got a different part number (16354-N3310) than the UK/Europe market (16354-N3500). The Australian market have the same as the North American market.
You quote N61, meaning what is etched onto the jet needle (yes?), whilst the microfiche for the European has N-56A. And my notes say N57 from the jet needle I physically took out. So, I had;
https://burlen.co.uk/
profile my jet needle N57, and got AUD1550 needle (KQ) as the nearest profile. If my memory serves me, it was very close, only at the point of the needle did the measurements differ, but this matters less, as this is where the full throttle operates on the jet needle. So, I would suggest getting yours matched, I don't know who in the US is any good on this, but I am sure someone else could recommend. If not, send them to Burlen...
Motorman7, if my memory serves me, there isn't a bush for the throttle spindle, just a drilled hole in the aluminium carb body. It maybe a solution if having bushings/bearing put in like Ztherapy does for the Hitatchi SU for the earlier models.
Here is also a picture of a pair of NOS nozzles for reference.