ORIGINAL: Hobie
I just tested my AA that has always flown good and the motors quit at the same time . It may not be the reason it flys so well but the one I took back that spiraled left the right motor spun significantly longer than the left when throttle was cut and using the trim pot didn't help . It is very simple to take the spring return off of the throttle . Remove 7 screws peel back the FCC label pry open the throttle side just enough to get a small screw driver inside and pry the spring off the return side . You don't need to remove the spring from the tx just pry it off the tension side

. Enjoy .
interesting that both your motors stop at the same time. the AA i just bought has one motor stop before the other, but flys fine with no turning tendancies. those little 6mm motors dont have much consistency between one and the next, some just work better than others.
anyway, i dont remember if NitroCharged posted his "turn without throttle" mod here, but here's another one that works well. like Nitros mod, this one requires some decent soldering skills to accomplish, or at least knowing someone with some good soldering skills.
1: ok, go to RadioShack and buy their little package of 1N4148 diodes. if they dont have those, 1N914 or 1N4001 should work.
2: remove the antenna and batteries from the TX and unscrew the screws and remove the cover of the TX.
3: by the right stick, you'll see some solder pads, labled R10, R12, and P11 (see pictures attatched).
4: solder the anodes of the diodes to pads R10 and R12 (see pictures)
5: solder the cathode of the diode to P11 (see picture)
6: double check solder connections, make sure nothing is touching something it isnt supposed to be.
7: reinstall batteries and antenna, power up TX, then the plane. push the right stick left and right, the motors should start up without having to add any throttle.
thats it! it took me about 5 minutes to do and it should make things a lot easier when flying. if you're not familiar with diodes, just solder them up like the picture (with the black band on the diode towards the bottom, it wont work if they're backwards).
nick