Originally Posted by
pejota
For a spur, i run 3racing's 92 tooth, 64 pitch gear. I am also running the stock motor mount. No issues with adjustments and i'm running a 47 tooth pinion for a 3.62 FDR. I'm still working on gearing/motor timing since i'm on a new track. Tightening motor screws is a pain with the stock mount, so i'm thinking of getting the vertical mount. From what i hear, the issue with that is flipping the belts and that causes issues with the battery mounting system. I think 3racing's battery system is the best i've ever seen, and i'm reluctant to get away from it.
With the vertical motor mount you must flip the belts to the other side of the chassis. The upper deck must also be modified to clear the motor mount, but this is relatively simple to do and takes only a few minutes with a Dremel and a small sanding drum bit. The effort is worth it in my opinion as you gain much better access to the two motor bolts.