Android 4.2.2 how to set default install path to external SD card

You don't need root access to do this. All you need is to enable Developer Options and then enable USB debugging. Once this is done connect adb to your phone:

root@bender:~# adb shell

shell@android:/ $ pm get-install-location
0[auto]
shell@android:/ $ pm set-install-location 2
shell@android:/ $ pm get-install-location
2[external]
shell@android:/ $ logout

root@bender:~#

as you can see from pm help page:

pm get-install-location: returns the current install location.
    0 [auto]: Let system decide the best location
    1 [internal]: Install on internal device storage
    2 [external]: Install on external media

You need to set this value to 2