Baja Motorsports WD400-U Operator's Manual - Manual (Page 49)

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TOOLS
A tool kit is provided with your ATV.
SPARK PLUG
Your ATV is equipped with a D8REA spark plug. To determine if the standard
spark plug is in good condition, check the color of the plug’s center electrode
insulator after vehicle operation. A light brown color indicates that the plug
is in good condition. A white or dark insulator indicates that the engine may
need adjustment, or a new plug is needed. Consult your authorized dealer or
Baja Motorsports if your plug insulator is not a light brown color.
CAUTION
Failing to use the proper spark plug could damage your ATV.
An improper spark plug may have an incorrect fit or heat range for your
engine. This may cause severe engine damage which would not be
covered under warranty.
Use only spark plug recommended for this engine. Call Baja
Motorsports if you are not sure which spark plug is correct for you
vehicle.