pinion

So I've recently upgraded to a 2150kv Brushless motor, with an 80amp ESC. Evrything runs good and works perfect, except for the clutch. I have the hex nut maxed out in tightness, but yet it still slips. You cant punch the throttle without it slipping. But i can ease into top speed. Im really...

is it even possible to convert a ruckus to 5mm pinion gearing? would it fit? or would there be a lot of modding involved?

Trying to upgrade my tornmemt for some serious speed on a 2s lipo. Have a castle 3800kv motor . What size if pinion should i be using for bashing?