Serial Number Locations/Serial Number Location CTM5 (20OCT92) 10-15-6 K Series Air Cooled Engine AllTractorManuals.com 220596 PN=19 CARBURETOR SERIAL NUMBER LOCATION—CONTINUED A—Serial Number Location -UN-07JUN91 M80507 FC150V -UN-07JUN91 M80508 KF82D/FZ340D -UN-07JUN91 M80509 FC290V -UN-07JUN91 M80510 FC400V/FC420V MX,1015A1,A5 -19-21OCT92 10 15 6