  It is well known that non-abelian Yang-Mills theories present non-trivial
minima of the action, the so-called instantons. In the context of electroweak
theories these instanton solutions may induce violations of baryon and lepton
number of the form $\Delta B = \Delta L = n_f$, with $n_f$ being the number of
families coupled to the gauge group. An interesting feature of these violations
is that the flavor structure of the gauge couplings is inherited by the
instanton transitions. This effect is generally neglected in the literature. We
will show that the inclusion of flavor interactions in the instanton solutions
may be interesting in certain theoretical frameworks and will provide an
approach to include these effects. In particular we will perform this
implementation in the non-universal $SU(2)_l \otimes SU(2)_h \otimes U(1)_Y$
model that singularizes the third family. Within this framework, we will use
the instanton transitions to set a bound on the $SU(2)_h$ gauge coupling.
