Baja Motorsports BR150-1 Operator's Manual - Manual (Page 49)

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SERIAL NUMBER LOCATION
You need to know the frame and engine serial numbers to get title documents
for your Go-kart. You also need these numbers to help your authorized
service center or Baja Motorsports order parts.
The Frame number is stamped on the frame behind seat. 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