Brushed help?????

[ashleyb4]

A few weeks before the indoor finals i ran my 14x2 in my xx4 and it was undereared and it got very hot it worked find afterwards but then the night before the indoor finals i tried it and there was a little puff of smoke come out of the motor and it stoped working. So thought poo have to buy another motor so i did but it was a bit quick so i wanted to try my 14 so i got my motor skimmed(thanks damo and stu) and i put it in my brand new 10x1 can and it went very very very slowly so i thought oh sticky brush someting simple. Then i tried it again after a bit of fiderling and it did it again so i just bunged the 10 back in and put the 14 back in my box and thought nothing of it. SO now i thought ill have a look into the problem. But i cant find anythign wrong with the armature. What can it be the can is fine as i ran my 10x1 armature in it fine but the 14 wont work??????

A

P.S.Help!!!!!!!