mechanic

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?

2009 ktm sx 85. This is my first complete rebuild from the bottom end up so I will likely have many questions down the road but I'd like to keep them all in one thread. Im not a mechanic so Im not great on noticing certain defects when it comes to engines. The piston had some bad scarring and...