[riverat1540]

sounds like a mesh problem, try setting the mesh with the pinion not set screwed to the shaft but let it turn freely on the shaft against the spur, and find where the mesh smoothest with the least noise. tighten the set screw and you should be golden. you are going to find that running a small pinion (anything smaller than 13-14) is going to eat a plastic spur very easily if not meshed perfect and even then will wear fast. unless running 5s the 2200kv combo is great with the large spur. I changed to truggy ring and pinions. you can use the hot bodies ring and pinions from the Lightning stadium to lower your gearing and run a smaller spur which will bring you closer to the original gearing with the 62t. its great because u can actually fit your batteries on the chassis with all the extra room. and you have more pinion options as mikes mount does not leave much room to gear up with the 62 spur. hope this helps.