Honda TRX420FPA Owner's Manual page 220

Vehicle Identification
Color Label & Code
The color label ( ) is attached to the frame under the seat. Remove the 1
seat (page 106 ) to check the label.
The color code is helpful when ordering replacement parts. You may
record the color and code in the Quick Reference section at the rear of
this manual.
UNDER SEAT
(1)
(1) color label
Technical Information 211