Baja Motorsports WD400-U Operator's Manual - Manual (Page 82)

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SERIAL NUMBER LOCATION
You need to know the frame and engine serial numbers to get title documents
for your ATV. You also need these numbers to help your authorized service
center or Baja Motorsports order parts.
The Frame number is stamped on front of ATV frame. The engine number is
located on the right side of the engine housing.
Write down the serial numbers here for future reference
Frame No.:
Engine No.:
Engine serial number
Frame number