Problem with animation precision

(Unity 5.3.1.p1 Personal)

Hello,

I'm new in Unity and I have problem with rotating animation.

I want to rotate object by 180° around y axis. So I made animation. Start 0°, End 180°, uncheck Loop Time and hit Generate Root Motion button. Attach to animator, check Apply Root Motion and made transition from Idle. Everything works well but the rotation is not precision.

It rotates randomly

178.2789

178.3417

178.2559

Here are some other screens.

Screen - Animation Start

Screen - Animation End

Screen - Animation Settings

Screen - Transition From Idle

Screen - Transition To Idle

Unity Project

What I did wrong? I know, I can use script this case but i want to use animation.

edit: sorry for my english