501x - Motor Gearing & Timing?

[JonB]

Hi,

Ive just got myself a 501x and am a little unsure about gearing.

I have fitted an 87t spur gear (instead of the kit 96t) and am running a GM 5.5 Sintered Rotor brushless motor (equivalent to the Orion Vortex I think) and a Nosram Matrix Evo 2007 Edition ESC.

Couple of questions:

1. What size pinion would be a good starting point?
2. Do I need to adjust the timing on the motor to run correctly with the Nosram ESC and if so to where? Ive read some conflicting answers on this.

Cheers Jon