Classes and engines

So i can buy a kart that has a horstman iame 100cc engine on it. years ago we ran the briggs class. I’m clueless when it comes to 2 stroke classes So What class would this engine run it

Sounds like an HPV/KPV engine which isn’t really run anywhere anymore except maybe in select isolated clubs.

Where are you located? That would give us insight as to what is raced locally.