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....

Sounds like you may have burned up a MOSFET in the 4-in-1.

-JT

Does that mean I have to get a new motor? Sorry I'm new to this...

Worse, it means you may need a new 4-in-1. If your tail motor still works, try reversing the two motor connections to see if your main motor works when connected to the tail motor plug. If it does and your tail motor doesn't work when connected to the main motor plug, the problem is in your 4-in-1. If you're very handy with a soldering iron and you can get the correct MOSFET, you may be able to repair your 4-in-1 if it's not too burned up.

-JT