The GP750 is capable of handling 250 up to 700 size.. but it has to be set to the correct helis. They separated the 2 into small and large helis. 250m 450, 500 are small then 600, 700 large. the gyro light tells you wether is set to large or small heli. I can remember the correct color but if i remember correctly red means small the green is for larger helis.. check the manual to make sure...