Today I switched all the top plastic parts with this: http://cgi.ebay.com/Metal-Upgrade-8p...QQcmdZViewItem since I got in a crash

I started tuning it, and everything was alright until I smelled something burning, I touched the motor, and it was hot. So, I turned it of and left it to rest... an hoar later, I turn it, increase the trottle... and nothing... the main rotor blades move, but don't spin... What happened?!

Thank you in advance....