wantoride-
an R50 is a 500cc, R75 is 750, and R100 is 1000, and so on. Same with the K-Series bikes, except that the K-s have an inline watercooled 3 (K75) or 4 (K100)laying on it's side so that the pistons are actually stroking horizontally. The early ones (K-series) had problems with oil seeping by the cold oil rings into the combustion chamber while the bike sat overnight, and being smokey until the engine warmed up, but I believe that BMW corrected that pretty quickly. Personally, styling was a big factor that kept me away from BMW's. I love the Boxer motor, even the new water cooled 4 valves, but don't care for the super-funky styling, even though I am normally a fan of Euro-styling. I would love the style of an older R65 or R80 with the new Boxer, and stuff....
