Please consider supporting me on Patreon: / thedroneracingengineer
The number one cause of a hot motor on a quadcopter is that one of the motor screws is too long and it is contacting the motor windings. I'll show you how to troubleshoot this scenario.
The multimeter that I use is: http://amzn.to/2o8LdTO
MANDATORY DISCLAIMER: I am a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for me to earn fees by linking to Amazon.com and affiliated sites.
Amzn.to links above are affiliate links, and I will receive compensation if you use them.