Polaris 2004 Victory Vegas - Manual (Page 38)

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COMPONENT IDENTIFICATION
Engine Identification Number
The engine identification number is a combination of the engine model
and serial numbers. The engine identification number is located on top
of the crankcase behind the rear cylinder.
The engine serial number is stamped into the rear of the crankcase just
to the right of the oil filter. You may need the engine identification
number to title, register, license or insure the motorcycle, or to order
replacement parts.
Ignition Key Number
The ignition key identification number is stamped into the shaft of
each key.
With the ignition key number and proof of ownership, an authorized
VICTORY dealer can assist you in obtaining a replacement key.
Notice For easy reference, record all vehicle numbers in the space provided on page 159.