  We show that if $K$ is an L-space twisted torus knot $T^{l,m}_{p,pk \pm 1}$
with $p \ge 2$, $k \ge 1$, $m \ge 1$ and $1 \le l \le p-1$, then the
fundamental group of the $3$-manifold obtained by $\frac{r}{s}$-surgery along
$K$ is not left-orderable whenever $\frac{r}{s} \ge 2 g(K) -1$, where $g(K)$ is
the genus of $K$.
