Update: It's a Euro 2 bike. Upon careful inspection, i noticed that the pipe between Euro 2 device and carb was leaking air. Replacing the pipe did the magic and now getting 60kpl (As i can guess, in order to compensate for air leaking, it required more fuel. As soon as I blocked air leak, RPM went high, so I leaned the mixture to set the RPM right)
@chaudhary9
Don't read this, I don't want to lose a friend through heart attack 