brushes

[notfastwes]

I have an lrp motor. its the first decent, rebuildable motor i have owned. in fact being a noob to the game i know very little. when will i know its time to change the brushes? only i am having a bit of trouble. The last couple of times i used the car when pulling the trigger not much is happening till i give the car a nudge then it gets going. its as if the car is stutering a bit. my initial thought was the batteries. but even with a new vapextech battery and new ones in the transmitter this is still hapening. Had the motor about two weeks and been using it for about 40mins most days. its been getting quite hot but then i do not know what the average running temp is in rc. Its a gt4 turbo 21x2.

Thanks

Wes.