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Homelite
The Baja Heat mini bike has a 200cc 6.5 Hp size engine.
gas
Castroil
A 2.8 = 97cc
monsterscooter parts has them on the internet for $42
It's not easy to do.
Buy a new one.
Go towww.bajamotorsports.net for complete owners manual.
You need a lighting coil (not happening on the stock motor), or a generator (like bicycles have), or you can put a battery from a motor cycle on it and run it like that, and just charge it each time.
No it is not possible to build a mini bike with a starter motor hanging down underneath.
http://jleibovitch.tripod.com/id247.htm