I put the actual upgraded shaft from hacker. Never ran it, sold the motor. I can imagine the magnet quality is better than a feigao, but the windings will be higher qual in the hacker. Longer magnet will lower the kv, not really a bad thing, as those maxx motors are 3000+kv.
Thanks for the info. I did not know that hacker made a updated shaft. I don't think it available anymore. I welcome a lower KV rating. The only reason I used the hacker in the first place was because I had it on the shelf for a while. I'm tempted to get a motor dyno if the price is right to check. I wonder if I could check it with my fluke meter on my home made Truck roller dyno?