Rotax 503 CDI on SCAT Hovercraft

Hi Guys,

I have a 503 CDI installed on SCAT Hovercraft 6ft.
I took it to a local shop where there were some "specialists" working on 2-strokes and i needed to changes the Carb to correct one because previus carb was form unknown engine - so it didnt run and got iced up in summer(+18C).

Now the SCAT is back in my garage and the "specialists" installed Mikuni VM38 carb on it.

So the main question is - is it correct type of carb on it? If yes, does anyone know what type of needles and jets etc is suitable for this craft?

Many thanks in advance!