Got a question for you guys on the b4.2. I am running a 10.5 turn motor, the car I bought has a JC Concepts 75 tooth spur gear, and it didn't have a pinion, so I bought a 30 tooth pinion just to have one to put on the car. I am going to be running this on a indoor offroad track, pretty tight track. Am I way off on the pinion gear, or pretty close. If I am way off, what would be a good starting spot on the pinion. Thanks