Speedfight 2 jetting problem

Hi iv a standard 50cc Speedfight 2 liquid cooled my problem is iv had to replace my carb as I tryed removing the main jet but ended up trashing it so I replaced it but noticed the main jet is missing could anyone help and tell me whet the standard main jet is for a Gurtner pa370 carb

 

Hi MadHead, standard for the pa370 is 72.

 

Seam a bit big for a little 50cc

 

Some peeps upjet them to 80+.
https://www.scootershack.co.uk/threads/speedfight-2-307-wrc.38040/
standard jet sizes (72 for the Gurtner and 83 for the Dellorto).