hi,
i have a quadcopter ,and config are ..

-Hobbyking Super Mini Quadcopter Frame with Motors (445mm)
http://www.hobbyking.com/hobbyking/store/__20946__Hobbyking_Super_Mini_Quadcopter_Frame_with_Motors_445mm_.html

-Hobbyking SS Series 8-10A ESC
http://www.hobbyking.com/hobbyking/store/__6455__Hobbyking_SS_Series_8_10A_ESC.html?strSearch=10a%20esc

- battery:- 7.4v , 3000mah , 25c

- kk 2.0 flight controller  v1.6++

my problem is , when my multicopter start flying at that time its move toward left side ..
it could not fly in stable position..
so any one can plz help me to sort out these problem..
i want to fly my multicopter in stable ..like vertical take of..

and  kk2.0 with version v1.6++ (by rolf runar bakke  rev.1 )

pi editing :-
# aileron / elevator
p gain = 50
p limit = 100
i gain = 25
i limit = 20

# rudder
p gain = 50
p limit = 20
i gain = 50
i limit = 10

#self leveling setting

p gain = 60
p limit = 20
acc roll / pitch = 0

here is the video..

Didn't found anything wrong with the quad yet.

Have you tried flying it without the thread?

yup i was fly my quadra without thread .. but still it move left side...

Have you looked around ?  You should have seen threads like this...

http://www.rcindia.org/multirotors/quad-tends-to-drift-forward/

you can nullify drift with trims on your tx or on your kk 2.0 in self leveling pid menu
pith and roll value can be changed in + /- to nullify drift depending on which direction it goes

thank you soo much chintal and anwar .... 
chintal your technic is help me ..and anwar your link help me a lot...  thank you ..
finaly my quadcopter flying properly... yiippiii  soo happy..   

Would love to meet up to test your build if you don't mind

yup sure....
i like too...
whr u live in mumbai ?

Vile parle east near station
Wt abt u ?