  We analyzed the long and short cadence light curves of the Kepler non-Blazhko
RRab stars. We prepared the Fourier spectra, the Fourier amplitude and phase
variation functions, time-frequency representation, the O-C diagrams and their
Fourier contents. Our main findings are: (i) All stars which are brighter a
certain magnitude limit show significant cycle-to-cycle light curve variations.
(ii) We found permanently excited additional modes for at least one third of
the sample and some other stars show temporarily excited additional modes.
(iii) The presence of the Blazhko effect was carefully checked and identified
one new Blazhko candidate but for at least 16 stars the effect can be excluded.
This fact has important consequences. Either the cycle-to-cycle variation
phenomenon is independent from the Blazhko effect and the Blazhko incidence
ratio is still much lower (51%-55%) than the extremely large (>90%) ratio
published recently. The connection between the extra modes and the
cycle-to-cycle variations is marginal.
