Im just ol fashioned but what is the point of cutting the commutatior?How often does it have to be done?When do you give up and chuck it?:)

comm's only need to be cut on brushed motors....the brushes and comm wear out fairly quick and must be replaced (brushes) and the comm cut to keep the performance up to par....the comm becomes black and out of round with use....some of the factory drivers would cut the comm after every round in the big races....average runs could vary from as few as 5 runs to as many as 15 or more....the more runs u get the less power the motor will produce....so if u want max performance u need to cut more often....bashers could run the motors until they just quit an then replace the motor..

comm's only need to be cut on brushed motors....the brushes and comm wear out fairly quick and must be replaced (brushes) and the comm cut to keep the performance up to par....the comm becomes black and out of round with use....some of the factory drivers would cut the comm after every round in the big races....average runs could vary from as few as 5 runs to as many as 15 or more....the more runs u get the less power the motor will produce....so if u want max performance u need to cut more often....bashers could run the motors until they just quit an then replace the motor..
"Fairly quick" is a relative statement. It depends on what kind of motor you are running.

I got a whole outdoor season (11 races, total of 24 heats) on a stock motor with the same pair of brushes running a spec battery. I cut the com each week to get the best performance, not because it was worn out.

I've also got a 19T motor in a 2wd offroad buggy that has probably 3 hours of runtime (that's a whole bunch of 5 minute races) on it without needing the com cut (I practice with it a lot).

On the other hand, an 8-turn motor run in my sprint car with a LiPo battery needed to have the com cut after each heat. But there was a 3 second difference in lap times between the stock motor and the 8-turn.

Im just ol fashioned but what is the point of cutting the commutatior?How often does it have to be done?When do you give up and chuck it?:)

you have mail sir. if you pull a brush out you can look at your com by putting a pinion on it and rotateing it , and if it looks like it has black spots on it and performance is down then it is time to cut. it will enhance performance and add life to your motor and if you have calipers you can mic the com when you first get it and then keep a eye on your cuts to see how far down on it you can go i cant remember how far it was befor the com comes apart which is not good if you are cutting it

Thanks for all the responses heres another question,some of my motors are fixed endbell and some with timing endbell,now does that only apply to the motors that have a removeable endbell?(timing endbell?)Because i can remove the endbells even from the fixed endbell.I would love to cut some of my motors i just never did it before.:freak:

the timing motors you want to mark on the can so you get it back to where it was and the other motors should go back together where they are at without a problem what motors are you useing

I got some yokomo motors trinity,kyosho,peak racing,team orion,some are vintage with little abuse.

i think most of those can be taken apart and put back together pretty easily and when you start turning your com amke sure to take off the least amount as possible at a time