Old vs New Flywheel date?

Hi Pete,

Sorry not a Rotax historian however can tell you that my 2000 Rotax 912 ULS had the old fly wheel. I had to replace my Sprag Clutch, so as part of this repair,  I took the opportunity to upgraded my ignition, to partial Soft Start, by installing a more recent fly wheel. 

Around 2012

It's really preferred that you reference a SN rather than a date.  See this link: https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-912-028.pdf

All engines equipped with ASM system from new:
912A (certified) from S/N 4411016
912F (certified) from S/N 4413041
912S (certified) from S/N 4924705
912UL from S/N 6771306
912ULS from S/N 6783234