Yamaha RST90L Owner's Manual page 33

To install the passenger seat and backrest
1. Remove the rear carrier. (Refer to steps 1–2 in the
"To remove the passenger seat and backrest" sec-
tion.)
2. Install the passenger seat, and then install the pas-
senger seat lock knob.
3. Align the holes 1 in the backrest bracket with the
bolts 2 on the carrier lock bracket, and then place
the backrest on the carrier lock bracket.
4. Align the holes in the rear carrier with the bolts on the
carrier lock bracket, and then place the rear carrier on
the carrier lock bracket.
5. Slide both the backrest and the rear carrier backward
until they stop.
6. Pull the carrier lock lever 3 up to lock the backrest
and the rear carrier in place. Then, place the lever
under the rear carrier and secure it with the holder.
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