Gearing for SV

[westyguesty]

Can anyone suggested a starting point for gearing on a cougar sv, standard gearbox.
Two motors, 10.5 and 13.5, running on small outdoors track. It for my son to get used to befoer racing, not bothered about going that fast, jsut keeping everything reliable.

How do I tell if it's gear right, motor temperature ?

Thanks.