Rotax 503 manufacture date

https://www.rotax-owner.com/en/support-topmenu/service-bulletins

Following the prompts in the link revealed no results for the 503 UL engine or my engine serial number.

You need to select engine Type 503 from the link above, here is a sampling of the dozens of applicable 503 docs ( do NOT search by SERIAL NUMBER as the vast majority of ROTAX docs are not specific to serial)

See also https://www.rotax-owner.com/en/support-topmenu/engine-manuals#2-stroke-historical-documents

for these older items:

HISTORICAL DOCUMENT (1994) 377-477-503	REPAIR MANUAL	Ed. 12 1989		2.24 MB
HISTORICAL DOCUMENT (1990) 377-477-503	OPERATORS MANUAL	Ed. 11 1990		13.3 MB

Thank you for your assistance.  I thought I was doing it right because I did select 503 UL but in wading through the results I didn't see those numbers come up.  I guess I'll just have to practice with the system some more.