  We report a search for $X(3872)$ and $X(3915)$ in $B^+ \to \chi_{c1} \pi^0
K^+$ decays. We set an upper limit of $\mathcal{B}(B^+ \to X(3872) K^+) \times
\mathcal{B}(X(3872) \to \chi_{c1} \pi^0)$ $ < 8.1 \times 10^{-6}$ and
$\mathcal{B}(B^+ \to X(3915) K^+) \times \mathcal{B}(X(3915) \to \chi_{c1}
\pi^0)$ $ < 3.8 \times 10^{-5}$ at 90\% confidence level. We also measure
$\mathcal{B}(X(3872) \to \chi_{c1} \pi^0)/\mathcal{B}(X(3872) \to J/\psi \pi^+
\pi^-) < 0.97$ at 90\% confidence level. The results reported here are obtained
from $772 \times 10^{6}$ $B\overline{B}$ events collected at the $\Upsilon(4S)$
resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$
collider.
