  The higher derivative gravity includes corrections of the second order in
curvature and allows for both Schwarzschild and non-Schwarzschild
asymptotically flat black-hole solutions. Here we find the grey-body factors
and energy emission rates for Hawking radiation of test Dirac and
electromagnetic fields in the vicinity of such a non-Schwarzschild black hole.
The temperature and mass of the black hole monotonically decrease from its
Schwarzschild value to zero when the coupling constant is increased up to its
extremal value. Nevertheless, for small and moderate values of the coupling
constant the Hawking radiation is enhanced, and only in the regime of large
coupling it is suppressed, as one could expect. The reason for such
counter-intuitive behavior is the important role of the grey-body factors: for
small and moderate couplings the temperature falls relatively slowly, while the
effective potentials for black holes of the same mass become considerably
lower, allowing for much higher transmission rates. We have also estimated the
lifetime of such black holes and shown that the range of black-hole masses at
which ultra-relativistic emission of massive electrons and positrons starts is
shifted towards smaller black-hole masses when the coupling constant is large.
