I tried the smartech stock main motor on my jabo2, the helicopter lifted 6 feets height at full throttle and it stayed at that height for only 3 seconds before dropping back down to the ground and only hovered 3 inches off the ground for the rest of the battery pack of 7 minutes. I went through 6 packs before I tried the second new smartech stock main motor. Same thing happened. It just hovered 3 inches off the ground. Then I went back to the original jabo2 main motor. Everything went back to normal. I can't count on the smartech main motor for lift.