throttle

hey guys I recently got a suzuki drz 125 and every time I start it it starts redlining in neutral and goes very fast in gear without any throttle. I checked the cabling and it looks fine so I don’t know what to do. Any ideas?

okay recently my carburetor was leaking gas when I drove it . I cleaned the whole carb and now it doesn't leak out the drain tubes and fixed the issues the new problem is when the bike starts up in neutral and you start to pull the throttle down fast the bike shuts off . It seems to not be...