Baja Motorsports BA90-2 - Manual (Page 77)

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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 INC. order parts.
The frame/vin number is stamped on the front of the frame as shown in the
photograph. The engine serial number is stamped on the left side of the
crankcase.
Write down the serial numbers here for your future reference
Frame No.:
Engine No.:
Frame/Vin number
Engine serial number
SERIAL NUMBER LOCATION