Remove the rear wheel & tire.
Tightening torque:
90 ~ 110N.m (9.0 ~ 11.0kgf.m, 65 ~ 80lb-ft)
Loosen the bolt (A).
Disconnect the assist arm (A) with rear carrier by using a SST (09568-34000).
Loosen the bolt (B) and then remove the assist arm (A).
Installation is the reverse of the removal.