Yamaha XC125RR Owner's Manual page 31

Turn the key on.
Put the sidestand up.
Push the start switch while applying
either of the brake levers. The engine will
start.
Put the sidestand down.
If the engine stalls:
The sidestand switch is OK.
INSTRUMENT AND CONTROL FUNCTIONS
WARNING
•
The vehicle must be placed on the center-
stand during this inspection.
•
If a malfunction is noted, have a Yamaha
dealer check the system before riding.
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