RE: Carburator 2 stroke engine
Bror,
It is an MVVS #3216 carburettor.
It is quite inexpensive, has a 13 mm diameter spigot and a 7 mm bore.
This is one of the most linear carburettors in existence, but I am not sure it will fit unaltered onto your TT, which may have a carburettor socket of a different diameter.
The older MVVS carburettor had an idle-stop screw, which this carburettor doesn't and a simple intake 'horn'; which in this carburettor has been replaced with an elaborate, double-curved horn. It has much better manners and linearity than carburettors that cost 3-4 times as much.