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The RX motors are fairly robust, and can be cleaned with ease, steps as follows
1) remove motor from chassis and then with a 9volt battery connect to the motor, this should spin it slowly.
2) if it doesnt then check the brushes these are located over the commutator and look like copper strips.
3) check the spring is in place and that the insulation sleeve is in place and intact.
4) With some very light wet and dry paper wrap this around the commutator and slowly turn it by turning the armature, this will shine the commutator up.#
5) Check the gaps between the plates of the commutator, and clean these gentley with a pin, remove the carp but do be gentle there will be three slots.
6) lightly oil the felt pads 1 at the magnet end and the other is in front of the pinion.

Reconnect the motor to the 9volt battery this should then spin up, reconnect motor in the body and lightly oil all the bearings for the axle and gear.

above should revitalise the motor and give hours of running, if it doesnt I am afraid you will have to look for a new one/

Zen
 

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I would suggest taking out the sport power base and replace with a normal straight.
What controller are you using for the 'e type', it is a puzzle, if as you say it works on a 9volt battery there should be no reason for it not to work on the track, are you using the same controller for the other cars, try putting the battery on the track and see if the car goes around without powering the track if you have booster cables disconnet these as well, I am afraid to say that at distance it is difficult to diagnose problems, if your other cars are going around then I am afraid it does sound like the motor has had it, although for the life of me I can see no reason for it working on a battery and not of of the transformer like the other cars if as you say they are all wired the same I just hope you havent fitted it with a digital chip, just as a safeguard change the insulation on the spring it might be that this is a problem and that it is shorting when it gets more amperage than from the battery.
I would hate to see the motor consigned to the great scrapyard in the sky and if you were closer I would offer to examine for you but there you go, I HOPE all goes well and that you the above will help to solve the problem, the good thing is that if you do have to replace the motor you should be able to maintain it well!!!.
Regards
Zen
PS thankyou for your kind words most people see me as a GRUMP maybe this will help
 

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Billy,
I dont see that changing the motor will solve the problem!!!, the motor runs freely when on the 9volt battery, when does it stop running freely, will it run in just the bottem of the chassis, when you put the body on does it stop, as I have said these motors run or they dont the fact that it does on a battery means it is OK, something else must be causing a problem, I hope you have oiled all the felt pads on the motor and checked the axle is free, there should also be a small amount of end flot on the armature, go through the above and check at each stage before moving on, it is possible that the old wires are shorting, or that one of the isulation pads is failing at higher voltage, if the above checks fail we are running out of options
Zen
 
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