How to tell what type of engine and make and model of my mini bike is

Mini Bike & Go-Kart Parts

I bought this mini bike chopper whatever about a month ago I've been painting it and stuff you know doing my own little thing to it but I want to know what type of engine it is that's on there because I think the sprockets wrong it looks like it's been messed with and the key doesn't match so I'm just trying to figure out what type of engine is really on there and I got the number please look me up on Facebook Glenn Lentz or thank you IMG_20210317_194540712.jpg