Esprit Models sells an AXI 2826 motor that they specifically describe as F2B.  They also have a regular 2826 motor. 
Does this motor have the mods that Igor does to the AXI's that you get from him directly.  I think its an extra winding.
These motors come from Czech Rp as an F2B .
Is this motor the special one?

We purchased a couple of AXI 2826/13 F2B from Esprit Models a couple of years ago.  The motor's price point and its pedigree set expectations for a higher than average performance potential.  In retrospect, I'd say that they did not quite live up to these high expectations. 

I started out with a bench test, by running multiple motors under the same load that emulates actual in-flight load (APC 10x6E at 10,400 RPM) and then comparing battery charge consumption and motor temperature.  The AXI was almost identical to Scorpion SII 3026-710, a little better than Cobra 2826-12 and E-Flite Power 32, but not as good as Plettenberg Orbit 20-16.  So far so good, although I noticed that the AXI was hotter after the run than most other motors.  I later correlated that to some of the highest winding resistance in the industry, which I can measure with sub-mOhm precision using tools at work.  This observation proved accurate in the field, as the motors were landing pretty toasty even in our mild Midwest summers.  On the positive side, I think AXI has some of the strongest magnets out there.

After a few dozen flights, I noticed that the shaft was no longer firmly held in the rotor by the two small set screws.  In order to get to the set screws, you have to remove the rotor and then an internal cooling fan, which is a flimsy plastic 3D-printed part glued in place.  It was impossible to remove the cooling fan without breaking it.  However, after looking at how the cooling system was designed in this motor, it was apparent that neither the fan nor the rotor body were doing anything to promote cooling, so I chose not to re-install the fan after the motor was re-assembled.  One of the two motors is still in service (another one was totaled at the Nats), but it is no longer on my list of equipment I'd buy again.  There are very decent motors out there at roughly half the price of AXI and almost identical performance.

Axis 2826/13 of the first version was made with a plastic fan inside. Mine broke during a flight. I was lucky the motor did not seized in flight and I heard clattering sound while carrying my model back after landing. The new version of the motor has aluminum fan.

Vitalis

So here are all 3 versions of AXI 2826/F2B with visible differences.
Left to right - v1 v2 v3

 

I had boxes marked every time differenet :- )))

If you mean to do it yourself, then not. Rotors are dynamically balanced and shimmed for exact free play and you cannot do it youself home.

The only chance is to post it to factory. Write me PM if you want send it.

Anyway, the point is not to let motor periodically overheat. I fly mine long time without problem with that plastic ventilator. But I use heat sink and I have it mounted reversed (on firewall) with minimally 2mm large space between fuselage and spinner. There is a suction and it takes hot air from output vent of motor out of the fuselage very well.

After the incident with the broken fan, I completely removed all the remainings of the red plastic off the motor. I'v had no problems with overheating afterwards as I also run the motor with an aluminum heatsink attached, which according to Igor himself is far more effective for cooling than a fan.


Greetings,
Vitalis P.