Jo90
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Aslong as you look after them just as long as a normal bearing. Clean them out after each meeting, unless the track is very dusty. I would have in your pitbox a can of compressed air. Never spray motor spray into the can - you will kill the motor as though the stuff can evaporate if it seeps between the windings it can cause corrotion, which duffs the motor.
Get a soft lint free cloth, your compressed air and carefully clean it out. I would say put some cleaner on a tissue and clean the rotor this way, dont spray on it direct.
When you do take the motor apart be very very careful of the spacers on the arm. I would recommend only removing the can end of the motor rather than the solder tab end. This end is just a cap with the large bearing in it, no sensors as such. You can then tip the motor down into your hand, remove the washers/spacers, and then carefully pull out the arm, along with the spacers on the other end.
Have a look at Racer this month, they have a novak opened out.
Lastly, once cleaned, make sure you oil the bearings with a good quality oil - NOT 3-in-1 as I saw someone doing once! The oil should be a thin type suited to bearings or bushings and not be harsh like sme mineral oils. One drop is enough - honestly.
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