Kick-starter problems on my KZ750 B1 Twin 1976

Hey Guys.

I am having trouble with my kick-starter. When I kick it, it does not return back to start position.
I took the cover off today to see if the spring was broken, it wasn´t.
I assembled it again and I turned the spring 1/4-1/3. Should the spring be tightened to 1 1/4- 1 1/3 before it would kick back?

Or is it somethings else that is causing the problem??

Hope that somebody can help me:-)

I'm tuned in because my '79 KZ750 B4 twin does the same thing. I just pull the lever up with my toe, but it'd be nice to have it working properly.