thanks EK for your help,
one more question...
one month ago when i start my mehran the sulf goes blank and no sound and nothing start the engine,it happen 1,2 times in a week,
after 3 weeks i go to a mechanic,the mechanic open the sulf and check it , sulf was fine, then check the bettry and said that the bettry needs to replace, i bought OSAKA 60 AMP (3100 rs + 700 for old bettry)
so every thing goes fine,
in last 3 days the same thing happen to me twice,
when i start the sulf, nothing happen, engine goes full blank,
then i use dhaka start, but after 6,7 feet dhaka the sulf goes perfect.
so confused !!! :s