hear are some of the ideas from
http://www.bladecprepair.com/cause.p...l%20Categories
Good luck.


Cause List
Flight time has decreased considerably.
My flight time has gone down to about 2-4 minutes and will barely hold a hover.
CAUSE: Battery is failing and/or will not hold a full charge.

LIKELIHOOD: 2 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Replace battery.

DIFFICULTY: 1 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.
CAUSE: Main motor is failing. If the motor is very hot after flight, it is failing. Ensure you are using the correct pinion for your setup.

LIKELIHOOD: 2 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Replace the Main Motor.

DIFFICULTY: 5 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.
CAUSE: Tail motor(s) is failing causing excessive amp draw.

LIKELIHOOD: 3 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Replace the Tail Motor.

DIFFICULTY: 4 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.
CAUSE: Main Motor to Main Gear mesh is too tight.

LIKELIHOOD: 12 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Adjust Main Motor to Main Gear mesh.

DIFFICULTY: 3 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.