There are a lot of parts on the Predator 212cc that you can upgrade and get a lot more performance out of your engine.
The “first three” should be your air filter and adapter, jet kit and your exhaust. This way you can tune your engine properly. After that, look into some billet parts such as billet predator flywheels or connecting rods.
If you need any help, take a look at Predator 212cc Engine Performance Forum
Predator Performance Air Filter Kit – $26
(1) Air Filter
(1) Adapter to fit GX200/Clones
(1) Choke hold bracket
(1) Carburetor Stud
Predator Go Kart Kit – Air Filter, Jets, Springs, & More! - $84.99