Honda CRF250F Owner's Manual Installation And Operation page 175

SERIAL NUMBERS
The frame and engine serial numbers are
required when registering your motorcycle.
They may also be required by your dealer
when ordering replacement parts.
Record the numbers here for your
reference.
FRAME NO.__________________________
(1) Frame number
50
The frame number (1) is stamped on the
right side of the steering head.
The engine number (2) is stamped on the
left side of the engine.
ENGINE NO. _________________________
(1)
(2) Engine number
(2)