Yamaha XS650SE Shop Manual page 125

the circuit from the main switch to
the relay - starter switch assembly -
"START" (button) is closed, and the
starter switch assembly is turned on,
thus causing the starter motor to start.
b) When the clutch lever is released while
the transmission is in position other than
neutral:
Neutral switch
Clutch lever
kept open, the relay is not actuated,
and it is impossible to turn on the
starter switch assembly by pushing the
"START" button.
As a result, the starter motor does not
run.
c) When the clutch lever is disengaged by
pulling in the clutch lever while the
transmission is in a position other than
neutral:
Neutral switch
Clutch lever
Since the clutch lever switch is on while
the neutral switch is off, the following
circuit - main switch - starting circuit
cut off relay - clutch lever switch is
closed and the relay is actuated.
The subsequent operation is the same as
a).
OFF
switch OFF
OFF
switch ON