Baja Motorsports DR125 Operator's Manual - Manual (Page 34)

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