Advice on brushed motor capacitors...

[pete2222]

Can someone advise me whether it's really necessary to solder capacitors to the rear of brushed motors. I'm not racing, just driving my B4 in the park etc.
My 1/10th scale electric experience so far has all been brushless, but I've now got hold of a couple of old brushed motors (without capacitors on) that I'd like to try out just to see how they compare.
Thanks