  We experimentally investigate electron transport in kagome-lattice
ferromagnet Co$_3$Sn$_2$S$_2$, which is regarded as a time-reversal symmetry
broken Weyl semimetal candidate. We demonstrate $dV/dI(I)$ curves with
pronounced asymmetric $dV/dI$ spikes, similar to those attributed to
current-induced spin-wave excitations in ferromagnetic multilayers. In contrast
to multilayers, we observe several $dV/dI$ spikes' sequences at low,
$\approx$10$^4$ A/cm$^2$, current densities for a thick single-crystal
Co$_3$Sn$_2$S$_2$ flake in the regime of fully spin-polarized bulk. The spikes
at low current densities can be attributed to novel magnon branches in magnetic
Weyl semimetals, which are predicted due to the coupling between two magnetic
moments mediated by Weyl fermions. Presence of spin-transfer effects at low
current densities in Co$_3$Sn$_2$S$_2$ makes the material attractive for
applications in spintronics.
