Manuals for it can be found here: https://www.rotax-owner.com/en/support-topmenu/engine-manuals#447-and-503-engines
To get all relevant documents that may be applicable to your engine, visit our page https://www.rotax-owner.com/en/support-topmenu/service-bulletins
You should search by date of manufacture and engine type, rather than serial number, as some bulletins cannot be qualified precisely by engine serial.
On the page above, click on search option "By Engine Model" and set the drop-down to your engine type.
Leave the button "all Document Types" selected.
Tick the box "Select Date Range" and set the 'From' date to the month and year of your engine production date, and the 'To' date to the current month and year.
Then press the Search button to get a full list of links to all the documents you can download.
You can check this list against your engine log book to confirm that all "MANDATORY" Alert Service Bulletins and Service Bulletins have been complied with.
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