Honda H5518H Owner's Manual page 12

2. SERIAL NUMBERS
Record the frame and engine serial numbers for your reference. Refer to
the serial numbers when ordering parts, and when making technical or
warranty inquires (see page 110).
The frame serial number is stamped on the right side of the frame. The
engine serial number is stamped under the air cleaner (inside the engine
compartment).
Frame serial number:
Engine serial number:
FRAMk NUMBER
I -
ENGINE NUMBER
10