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· Premium Member
318 Posts
Discussion Starter · #1 ·
Hi All

My older slot it cars all seam to suffer from motor issues. I think the are the V12 2 motors with the white end bell???

When i put them on the track they run very slowly even on full throttle, they keep having bursts of speed. When i run them with the wheels up they smoke from the motor for about 10 seconds, splutter and then start running full speed.

Even when they are back to full speed they run terrible, very jerky and not at all smooth. I've had a couple of them apart and cleaned them but this dosnt really help.

I have about 8 cars like this, Any thoughts??? I don't want to have to start replacing motors.

I should mention I run at 12V on a large Scaley track non mag



· re member
5,197 Posts
If you have cleaned them and they still are running sick then maybe they have had their day...

I presume you focussed your cleaning on the brushes and comm...polishing the comm and cleaning between the segments.
Basically degreasing the whole and complete endbell assembly(including brushes)of the motor and cleaning the comm should give new life to the motor.

Maybe the brushes are worn out or maybe the comm is worn out?

· Nobby Berkshire
1,987 Posts
It is strange that all your cars are doing this at the same time. This would suggest - maybe - that you are either oiling them with something that has destoyed them, or your controller needs upgrading to a 15ohm or 25ohm type. Both motors and controllers smoke if your ohm rating is too high.

If you follow Munter's advice and they still don't work then throw them away.

If you are oiling them with something that has destroyed them, or running them in some way other than normal use, then stop doing it

· Rich Dumas
4,644 Posts
The first thing to try is to spray contact cleaner directly onto the commutator while the motor is running at six volts or so. That treatment will remove any oil that might be on the commutator and can also remove dust that has gotten stuck in the commutator slots. If that treatment has little or no effect there may be a burned on layer of oil on the commutator that will have to be polished off or there could still be dust in the commutator slots. The next thing to try is to pull the endbell and carefully remove the brushes. In order to get at the commutator you need to remove the armature from the endbell, if a pinion gear is still in place it will have to be removed. If the slots are still full of dust you can srape them out with thin, stiff plastic, like blister packaging material. If you use metal to do the scraping you might scratch the commutator. You can use a dab of metal polish on a cotton swab to clean the commutator. It is possible that the motor brushes are worn out. These motors have brushes that are mounted on feelers, rather than using brush springs like SCX motors. A feeler may be bent so that there is not enough brush tension. It is difficult to get optimum brush tension with the feeler arrangement. Somemtimes you can swap in a brush assembly that is in better shape.
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