Ha ha ha!If you look at a 912 or any other Rotax 4 stroke, you can not help but notice all of the crap hung off of the engine with precariously high mass at long moment arms. No wonder they are maintenance hogs! I use them as a worst case example on how NOT to build an A/C engine.
Not sure what world you inhabit BUT Rotax 912 's have much lower servicing requirements - 3Loil/filter/plugs (if you feel like it) change every 100 hrs. There is also a "rubber" replacement every 5 years - any half decent, well prepared, home mechanic can do the lot in a morning, with all, but a few, parts coming from your local automotive store.. Most will make TBO & well beyond without any intervention at all (there is a mid life gear box check). Personally I find them easy & intuitive to work on. Big plus in my book is they are all metric & just like any automotive boxer engine - simple as.
I have heard LAIM's winging about them but that's because they are brainwashed on LyComs, to work on anything else puts a strain on their comfort zone - no logic in it whosever.
You can argue with me to your hearts content but the sales figures for Rotax 80-114 hp engines, world wide, eclipse the LyCon equivalents (I would speculate Jabs as well).
If you want smooth, low noise, comparatively high power to weight, low fuel burn, reduced air pollution, astonishing reliability - GO ROTAX!!!