  The spin-down rate of PSR J1023+0038, one of the three confirmed transitional
millisecond pulsars, was measured in both radio pulsar (RMSP) and X-ray pulsar
(LMXB) states. The spin-down rate in the LMXB state is only about 27 % greater
than in the RMSP state (Jaodand et al. 2016). The inner disk radius, r_in,
obtained recently by Ertan (2017) for the propeller phase, which is close to
the co-rotation radius, r_co, and insensitive to the mass-flow rate, can
explain the observed torques together with the X-ray luminosities, Lx . The
X-ray pulsar and radio pulsar states correspond to accretion with spin-down
(weak propeller) and strong propeller situations respectively. Several times
increase in the disk mass-flow rate takes the source from the strong propeller
with a low Lx to the weak propeller with a higher Lx powered by accretion on to
the star. The resultant decrease in r_in increases the magnetic torque
slightly, explaining the observed small increase in the spin-down rate. We have
found that the spin-up torque exerted by accreting material is much smaller
than the magnetic spin-down torque exerted by the disk in the LMXB state.
