I had 50+ flights on my first stock motor before I had any problems with it.. Since you've replaced the stock head the first thing you need to do is make sure the heli is mechanically setup before even trying to spin the rotor up. This means checking everything is straight, no binding, swash is leveled, servoarms are 90deg at mid throttle, zero pitch at mid stick, gear mesh (main and tail) and so on.. If one or more of these things are not setup properly the heli won't fly or it will fly badly..
If you disconnet both motors and set the PLT and PIT knobs to 12 o'clock and center all the trims except the throttle trim (should be all the way down) and set the throttle to mid stick.. Then check your servo arms to see if they are close to or are 90deg to the servo, if not this needs to be fixed.. Adjust the arms to get as close to 90deg to the servo as possible trying to keep all three at roughly the same angle..
Next you need to level the swash and make sure the antirotation pin is centered in the antirotation bracket.. When this is done, look at the blade grips from the side and make sure the flybar is level, you should now have 0deg or close to 0deg pitch at mid stick.. If not then you need to fix this as well.. Loosen the blue "T-Block" and slide it up or down within the grove in the main shaft to get 0deg pitch if possible, if still not at 0deg you need to adjust the lenght of the push rods going from the swash to the mixer arms.. Lengthening them will move the blade towards negative pitch and shortening them will move the blade towards positive pitch..
When all this is done fine tuning can be done with the PLT and PIT knobs.. Use the PIT knob to fine tune the pitch at mid stick and the PLT knob to set how much pitch travel you need/want..
Finally, push the throttle stick forward to see if the swash is moving down and the pitch goes positive.. After these steps if the motors still burns out you might suspect a faulty 4-in-1..
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