how small of a track are you talking about? (50 x 50, etc).

Out here in general when running full mod, guys were using about 84 to 87 spur when boosting 13.5 - 17.5 motors in general. Not sure if the viper though does something different than others when boosting that could affect your gearing.


nikos: just to clarify, the motor I am looking for would be the same size basically as truggy motors. That is what HPI ships the 1/5 savage is a truggy motor. Its light enough that it works great with those. I figure if I like the benefits of the VTX8, should be killer in the Savage.

Heck if you wanted to test one out to show how tough they are, I would be more than happy to ablidge