Engine is most likely a Leopard or an X30. My guess is Leopard. Any 2 cycle kart shop should know their way around this engine.
The Alpha dealer is in Houston, TX. You will find that many kart parts other than brakes and front spindles are interchangeable. The Iame importer is IAME East in North Carolina. Google both for contact info.
My recommendation is ‘just drive’. It takes a bit to get fast in a kart. Find a local kart shop, buy your parts from them, and they should help you at the track figuring everything out.
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