Rotax 582

Dear Tech Guy!
Sir,
Where can I look to find all the derivatives of the Rotax 582 that were manufactured including snowmobile and aircraft versions?  And will the Motor Nr. identify this information for an engine and who can look this up?
Thanks,
Greg Otto

Tech Guy Responds
Unfortunately there really is no good listing of all the derivatives.  There are many versions of this engine displacement and the serial number will not differentiate them.  The later ultralight engines all have dual ignition and are drilled and tapped for a gear box.  The snowmobile versions all have single ignition and are cast but not drilled and tapped for the box. The snowmobile versions have a slightly lighter crankshaft and different port timing, and pistons, and are not optimized for aircraft use
Hope this helps.