Yamaha RS90K Service Manual page 306

Is self-diagnosis code 15, 16, or 42 displayed?
YES
NO
Has carburetor icing occurred or is foreign material
stuck in the carburetor?
YES
NO
Is the throttle switch malfunctioning?
YES
NO
Is the throttle cable free play out of specification?
YES
NO
Was the engine revved with the V-belt removed?
YES
NO
Is the throttle position sensor, speedometer unit, or
speed sensor installed incorrectly?
YES
2
1
7
8
9
T.O.R.S. OPERATES.
3
5
6
8-5
IGNITION SYSTEM
Check the affected item(s).
Perform carburetor maintenance.
Repair or replace the throttle switch.
Adjust the throttle cable free play.
Refer to "THROTTLE CABLE FREE PLAY
ADJUSTMENT" in CHAPTER 2.
When the engine is revved with the V-belt
removed, the speed sensor is diagnosed as mal-
functioning and T.O.R.S. operates.
Install correctly.
1 Pickup coil
2 Engine speed
3 Ignitor unit
4 Ignition
4
5 Throttle position sensor
6 Throttle switch
7 Speed
8 Speedometer unit
9 Speed sensor
– +
ELEC