Right i need some help i have purchased a low mileage engine with Olympia race crank and a 166 malossi kit all brand new, and had it all ported casings barrel piston the lot

Now then the issue ive had is with Carbs (kinda obv as ive posted in the carb section) but anyway i was going to use a 24mm with my new engine but after looking through the ones at my disposal nun deem fit for use, other than a t5 24mm so i banged that one set the jets to the very similar setup of a normal 24mm and it ran absolutely crap. So off i went to dabbers ride out and while there i met a fellow with the help of (Dangerous for those how no him) who was running a 166 kit normal crank with a 28mm carb his scooter was white and blue with Michelin on it and the number 85 with a sticker that read kwikasfuki on the side panel anyways knowing i had a few 28mm carbs at hand i went home and try one out. But now the issue is i have no idea really what settings to use at the moment i have got it going and it pulls really well but as im only going upto half throttle due to running in its hard to tell done a plug chop at 35mph and plug was a very light brown i.e if it was a biscuit it was a rich tea what is my best step forward in settings wise as i have found nothing that really helps on the forum.
ino it needs making abit richer at half throttle or between 1/4-1/2 but whats the best way todo it.
Anyways loads to take in there but all help is welcomed.
P.S if anyone knows the kwikasfuki give him a shout for me as im a dope and forgot to ask.