Not that i know off.
I have had 3 13.5 X12 here and all did about the same RPM and AMP's.
On track it was the same.
The 4th X12 puzzled me a bit as it did give high RPM but it took a lot off amps also.
Disassembled the motor and shimmed it correctly(rotorsensor poles as close to the sensorboard as possible) and then it was ok.
Had good RPM, nice amps and a lot of speed on track.
With or without a lot of mechanical timing on the motor it did run very nicely.
Ever tried a different ESC with the motors?
I always use a Tekin with the LRP X12 or X11 as this gives me the best result and good temps in whatever car i run them.
Now using a X11 10.5 in my Pro10 and man this thing flies.
Good runnign time,great torque and nice temps.
Did a 20 minute run with 5000MAH lipo's and still had more MAH left.
With a X12 13.5 with the Tekin full open and a 7 minutes race, i use upt to 2400 to 2800MAH per 7 minutes and motor is about 60 degrees celcius and no fade at all.
It looks like you got a bad one or it was damaged due to heat problems?.
PS the B4 LRP are not so good as the X12
Originally Posted by Three
Are there different versions of the X-12 Motor?
Am going to pull the motor out of my 12th scale and try it during practice next weekend.