A good reference for a 'non kite' P2 is Sk Gaming's world first kill video. Concerning the transition into P2, a great indicator is Bigwigs' enrage timer: just aim to kill M'uru with 2-4 seconds left on the timer until the next full minute starts.
For example:
6 mins P1:
4:01 to 4:05 left on the timer when M'uru dies makes for a clean transition.
5 mins P1:
5:01 to 5:05 left on the timer when M'uru dies makes for a clean transition.
To illustrate this, check our video:
M'uru