Originally Posted by mini-dub

Yeah the motors definitely have strong pull when you put a tall gear on, I just wanted to get you a little closer to our standard setup to be able to help you better. Everyone's setup and track conditions will be slightly different, run what works well for you. But if you're having trouble and not seeing the results you expect it's usually a good idea to start where we know it works

If you try increasing the motor timing you may find a much better powerband by running the larger spur. More motor timing = more rpm/less torque. Less motor timing = less rpm/more torque.