Traction Problems
 

I recently put together a HPI RS4 SS. i went to break it in today. the engine started but the wheels werent going. What could be the problem??? If i spin the clutch everything moves properly. all the wheel will spin back and forward. but when the engine starts nothing spins. if u can help i would appreciate it.. thanks..

Traction Problems
 

if you spin the clutch?

you mean if you spin the spur gear?

take off the spur gear, and take off the clutch bell and make sure the clutch is on right and then put it back togther.

you prolly just missed a small step that you would find if you re-did something like the clutch bell.