ORIGINAL: illz
ok i'm trying to lighten up my load..
if i would to purchase a 250 brushless outrunner motor, would it work with the 40amp ESC?
Yes, it is OK to put a bigger ESC on a smaller motor, although this is overkill for that small motor.
I'd buy another inexpensive ESC to use in it's place and save that 40A ESC for another plane.
Remember though that it is the propeller that ultimately determines the amount of current draw, and you must not exceed the recommended maximum power draw for that motor.
ORIGINAL: illz
also if i would to purchase a thunder power 7.4v 480mah lipo would it work with the 480 motor?
thanks in advance guys
Sure, but the RPM's would be very low, and your plane would produce little power, since the 480's tend to be designed for 11.1v.
When you step down the voltage, you normally increase the KV rating, and vice versa.
Why not just get a plane that matches your 480 motor and ESC?
There are plenty that will work... e.g. Electrifly Reactor EP 3D, etc.