On my MTX4, I found out why I am having the stripping issue with second gear. The bearing in the 2nd gear housing was hanging up, thus causing the strip. When I put a new housing on with a fresh bearing, the stripping stopped. Upon examining the last one, I put it on an old shaft from my MTX3 and spun it; it did not spin freely. Word of advise, clean and lube it after a few runs for those that don't clean this bearing and see if that stops the stripping issue (if the gear is meshed right). I am going to see if the bearing can be punched out and replaced with a better on (possibly ceramic).