what kind of track. my track has a long straight and jumps not really made for a stock motor more the 19t spec and i geared it stock spur with a 20t pinion and it ran fast plus with the right batts had the punch to make the jumps. do not go higher then a 22t as it starts to go slower after a couple of laps due to excessive heat. the motor like's to run cool. the cooler the better and it runs that way longer.
hope this helps.
Team SR Crew
Island Raceway and Hobby
He who doesn't have the most toys can always buy more.