i would like to get a neu motor but they are too expensive for me. and could i wire a 2s and 3s lipo in series with the same mah, c rating and all that stuff?
Yes you can. I do that right now since my batteries were the same age and have the same number of cycles. I had tried 2 x 2S, 2 x3S, and 2S + 3S in series.
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)