Honda Marine BF40A Owner's Manual page 6

IDENTIFICATION NUMBERS
PRODUCT IDENTIFICATION NUMBER
Record the Product Identification
Number (P.I.N.) and the Engine Serial
Number for your reference. Refer to the
Product Identification Number when
ordering parts, and when making
technical or warranty inquiries (see page
110).
ENGINE SERIAL NUMBER
The Product Identification Number is
stamped on a plate and attached to the
right stem bracket. The Engine Serial
Number is stamped on the cylinder
block under the starter motor which is
located in the front of the engine.
Product identification number:
Engine serial number: