Motor Troubles

[Re~Mix]

Well I did a few test runs lately, and the old batteries seem to be doing alright actually. So i now have brand new 4200's anyways, not such a bad thing. After running for a few minutes I noticed that the controller heated up pretty quickly, and the motor was running fine and cool. Im using a digital temp gun, so things are accurate. Its a 9L / 9920 geared 13/51. I think things are good, but I know that the sketchy soldering connection between the motor and controller could cause excess unwanted heat (and a loss in power) correct? If I do end up needing a new motor, I'd probably have to wait for a sale or something, since with the money I'll have wasted for 2 motors could of paid for a nicer Hacker B50L or Lehner.