I just upgraded the 390's in my Heng Long 1/16 scale RC tanks and left with six Red390 motors for sale, for trade or for free give away.
These motors are all purchased from Toucan Hobby with the Heng Xin gearbox or separately in the last 2 years with less than 3 hours of run time on them. They were all individually tested. RPM varies from 26000 to 30000 at 8 volts supply. All case temperature stablized at 19 deg F or lower above ambient after 10 minutes of continuous running.
If you are a RC Tank Club organizer who helps promote our hobby, you can request them for free. For individuals, they (6 motors) are yours for $20 shipped.

An old thread with information on 1/16 scale RC tank motors:
These motors are all purchased from Toucan Hobby with the Heng Xin gearbox or separately in the last 2 years with less than 3 hours of run time on them. They were all individually tested. RPM varies from 26000 to 30000 at 8 volts supply. All case temperature stablized at 19 deg F or lower above ambient after 10 minutes of continuous running.
If you are a RC Tank Club organizer who helps promote our hobby, you can request them for free. For individuals, they (6 motors) are yours for $20 shipped.
An old thread with information on 1/16 scale RC tank motors:






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