I've always loved the big BMW boxers. Not sure how parking lot rebuildable they are.
They haven’t built an AirHead (air-cooled motor) since 1995. Pretty sure the OilHeads are quite complex.
?????
I owned the last of the classic air-cooled gummikuhns, a 1994 BMWR100 GS/PD, it was beautiful and I would have kept it forever but I cannot abide an unreliable bike. Pretty bike, lots of class, but a POS in execution. After three significant warranty repairs I had to accept the fact that it was never gonna be "fixed" and sold it off as soon as I paid it off two years and 45,000 miles after I bought it. It looked good sitting in the driveway but sucked as a daily driver.
During that time I attended two BMW National Rallies along with a good friend who had just bought then then new Oil/air cooled 1200cc (??) GS version. At both rallies R100 GS/PD's like mine had to be towed/shipped home, so it weren't just me. I got lucky, even though the cylinder studs on the left side pulled en-route (cases later replaced under warranty) mine got me back from Colorado.
My friends significantly faster and more powerful fuel-injected next generation GS went as far on his six-gallon tank as my old-school R bike went on it's nine. But I could service that old-school R bike all by myself; simple valves, conventional carbs, it was simple.
I confess, I dunno what is involved on the new ones.
"...if the gentlemen of Virginia shall send us a dozen of their sons, we would take great care in their education, instruct them in all we know, and make men of them." Canasatego 1744