Hi,
I use 84/15 with my Vector X11 6.5. I think you will have gear mesh problems using a smaller pinion with this 84 spur gear. Change it to a 87 spur gear and start with a 14 tooth pinion with the 4.5. Then check the temperature. I think a 15 tooth pinion will be too big but you may have a try.
A 4.5 motor will be too powerful for an offroad car I think. You may also have ESC temperature issues with this motor if you don't use a fan. The body of the Yok is tight and needs to be cut if you decide to use a fan.
If I were you I would rather buy a 5.5 or even a 6.5.
I hope this helps.
Gil
|