Dellorto 20/15 for a vbb 150cc ?

[nanook]

I have a 1961 vnb 125 with a dellorto 20/15. Recently i found a complete 150cc vbb top end. I would like to install the 150 to my scoot but was wondering what new jet I should get in my dellorto if it’s possible to keep the 20/15.

thanks.
Rob