I upgraded my hacker c50 maxx motor shaft

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?