The Baja Heat mini bike has a 200cc 6.5 Hp size engine.
Homelite
A 2.8 = 97cc
Castroil
gas
It's not easy to do.
monsterscooter parts has them on the internet for $42
Go towww.bajamotorsports.net for complete owners manual.
Buy a new one.
http://jleibovitch.tripod.com/id247.htm
To way to fix that ... eiter change the oil or your ckoke may be broken I have the same bike and that was the way i fixed it.
When you change the oil put in 0.53 qt. (0.5) L