The activation of this (amber yellow) "warning" indicates that the engine coolant temperature is high.
It is activated when the temperature reaches 121C (250f).
Note
In this case, stop the vehicle and switch the engine off immediately; make sure that the fans are working.

Low hands free key (hf) battery level
Steering release error - steering still lockedSteering angle adjustment
Loosen the nuts (17) and adjuster screws (16) on both sides of the bottom
yoke.
Use a 6 to 6.5 Mm spacer (a) fitted to the fork outer tube, or use a gauge.
Turn the front forks to the right until the spacer (a) is seated against the
frame top tube.
Tighten the adjuster screw (16) to ...
Engine temperature sensor
Introduction
The engine control system on the diavel uses a sensor that measures the
temperature of the coolant (engine
temperature). This sensor has a resistance of ntc type (negative temperature
coefficient), that reduces its own value
when the temperature increases. The engine temperature ...
Steering head: steering
Screw
Steering head
Screw
Lower rh u-bolt
Lower lh u-bolt
Bearing
Screw
Sealing ring
Washer
Spacer
Washer
Nut
Washer
Screw
Bottom yoke
Dowel
Nut
Screw
Special screw
Clip nut
Left-hand support
Front splashguard
Right-hand support
Front support
S ...