50-50 said:A stock motor is perfect for stunting! Anybody who tells you the motor is at fault is fooling themselves because they are actually the reason their 50 can't stunt.
To start you don't need anything, but your first mod should be street tires. I have Pirelli SL26s and they're pretty cheap. I think it's IRC that offers even cheaper street tires. The second thing I'd tell you to get is a rear hand brake. That will help you with more advanced stunts plus for me it was a safety net. I felt more comfortable grabbing the hand brake to prevent a loopout instead of hitting the foot brake. And sometimes your feet aren't on the brake. It's saved me from numerous wipeouts. Extended break arms will help with stoppies and saving loopouts too.