I put in my '99 model John's chip stage 9 with a newer ECU from Bosch starting with a 7 instead of the older one (4). Works fine, more torque and a significant better MPG. It's a cheap way to get more drivingfun out of the LT.
Thank you for adding your experience.... BUT part of your message could be interpreted wrongly by the OP who asked the question as you cannot use any/all Motronic unit from any/all K1200LT years.
The important facts missing are:
(1) early 1999-2000 models of the K1200LT came with a Motronic EFI unit which part number ended with "1 465 194". These early EFI main unit cannot be chipped (opening unit and swapping the chip)
(2) ALL later Motronic EFI units had a part number with a "7" instead of the "1" in position stated above. These can be chipped IF-AND-ONLY-IF you have proper chip for 1st generation engine model (1999-2004) ...OR... proper chip for 2nd generation engine (2005-2009) depending on your bike. You should NOT mix-match computer units for both generation as intake size, compression, camshafts are not the same.
(3) In case you have the early unit (1 465 194) you could buy a used Motronic Units that can fit a 1st generation ENGINE of K1200LT. These are EITHER: "7 655 478" , "7 659 048' , "7 656 984". Once you have a "7" number unit, then you could buy a 3rd party replacement chip. I do NOT endorse or sell any of these 3rd party chip... I am only stating what you need to check before you install these on an early 1999-2000 models.
In order to check what Motronic version you have on your K1200LT, you may use either of these 3 methods:
(A) Remove unit from under fuel-tank to read label on unit (see attached photo),
(B) use a GS911 with "Auto-Scan" menu to read data from unit,
(C) have dealer use his diagnostic computer to read data from unit.