I have a 2004 50miniadvnture and my son hasnt rode it that much. I bought it new in 04 and it might have 15-20 hours on it. Well kept up as far as oil changes and air filter . But now after 5-10 min. riding it wants to pop and die. Its like its geting hot????? I´ve cheked everything that I can think of ???? I have cleaned the carb. jets. changed jets. cheked reeds. look great. cheked the sta. changed the oil inj. and tryed premixing the fuel. Its like it is getting hot. Now it is eatting plugs. I´ve done everthing but a new top end. I need HELP?????? Thank you Buddy S.