Hi Jeff! The records are quite clear in this case, 4400691 was produced 6th December 1995 and delivered to the Australian distributor on 18th December 1995
ROTAX serials are spread out across different production runs of numerous models of engines, so serial number can't reliably be used to accurately infer production dates.
...to illustrate, here is a random sampling of "4xxxxxx" engine serials and their distributor delivery dates:
4152030 27/01/1993 4152442 24/01/1994 4152496 24/01/1994 4153243 16/01/1995 4400691 18/12/1995 4400993 24/04/1996 4403005 31/08/1998 4407851 19/05/2006 4408662 10/07/2007 4417832 25/06/1999 4418046 12/06/2001 4428986 17/02/2003 |
BTW, if you are actually asking about 4400961 - that engine is a 912UL produced 04-Apr-1996...