My Xb8 Brushless, video on track

I think that the 9L is closer to a 2500kv motor. I would suspect that your controller needs a heatsink, as has already been mentioned.

As for the gearing, I'm running an 8L in my buggy right now with 10/46 gearing and haven't had any problems with heat.

I think that the 9L is closer to a 2500kv motor

Yes i have see that on feiago website but in my motor (buy here) its indicate " 3445 Kv" strange no?