Choppers is probably right, my old used Cx I got from my dad needed new motors bad.
It took off and flew for 4-5min fine but didnt seem to have much yaw, it did, very little, and it was weak,
so maybe a new battery, and Xtrme motors will help this problem. Oh and my opinion, id like to have
a cx2 that spins quick also and responds well, not a weak turd lol.