Yamaha RS90K Manuel D'atelier page 639

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Check the main fuse and ignition fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
Check the engine stop switch and main switch.
Refer to "IGNITION SYSTEM".
Check the electrical starting system's wiring.
Refer to "CIRCUIT DIAGRAM".
Correct the connection.
ELECTRICAL STARTING SYSTEM
OK
OK
OK
8-11
FAULTY
Replace the main fuse and/or ignition fuse.
FAULTY
Replace the right handlebar switch and/or main
switch.
FAULTY
Properly connect or repair the electrical starting
system's wiring.
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ELEC