hey i dont know how to post a link but um i found this thing on rewinding motors it seems prety easy to do if you feel like buying the right wire it is for rewinding a scooter motor but it looks the same only bigger i think i could rewind one myself right now just from reading the page. so here it is also it doesnt statew this clear enough or as many times as i thought it should less winds than before it will give it higher rpm but more winds gives it more torque well here you go
http://www.scootersupport.com/motorrewind.htm
also if any body tries this would you message me and tell me how it goes