Suzuki VZ1500 Owner's Manual page 166

 WARNING
Performing the spark test improperly
can cause a high voltage electrical
shock or an explosion.
Avoid performing this check if you
are not familiar with this procedure,
or if you have a heart condition or
wear a pacemaker. Keep the spark
plug away from the spark plug hole
during this test.
COMPLAINT: Engine stalls.
1. Make sure there is enough fuel in
the fuel tank.
2. If the fuel injection indicator displays
"FI", showing signs of trouble in the
fuel injection system, take your
machine to an authorized Suzuki
dealer. Refer to the "INSTRUMENT
PANEL" section for an explanation of
fuel injection system indicator.
3. Check the ignition system for inter-
mittent spark.
4. Check the idle speed. The correct
idle speed is 900 – 1100 r/min.
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