Baja Motorsports WD400-U Operator's Manual - Manual (Page 76)

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Ignition System Check
1. Remove the spark plug and reattach it to the spark plug lead.
2. Turn ignition key to the “RUN” position. Slide the engine stop switch
to the “Run” position. Push the electric button “START “(grey button).
Apply the rear brake lever to make sure the rear wheels are locked. If the
ignition system is operating properly, a blue spark should jump across
the spark plug gap. If there is no spark, take your machine to your
service center.
COMPLAINT: Engine stalls
1. Make sure there is enough fuel in the fuel tank.
2. Check to see that the spark plug is not fouled. Remove the spark plug
and clean it. Replace it, if necessary.
3. Make sure the fuel valve is not clogged, and the fuel tank is not clogged,
either.
4. Check the idle speed. If necessary, adjust it using a tachometer. The
correct idle speed is 1400~1600 r/min.
WARNING
Performing the spark test improperly could be hazardous.
You could get a high voltage electrical shock if you are not familiar with
this procedure.
Do not perform this check if you are not familiar with the procedure.
Do not point the spark plug near the spark plug hole during this test.
Do not do this test if you have a heart condition or wear a pacemaker.
Do not perform this test near any open fuel containers or fuel which
has spilled on the ground, on the engine, or any part of the ATV.