2021年2月11日 · In the early 1970s, most of the motorcycle manufacturers had one or two of those goals nailed down, but rarely all three. Then, in 1973, BMW released the R90S. It was a big step forward for BMW, but not as hyped today in the same way as the Kawasaki Z1 900, the Norton Commando, or the Ducati SuperSport.

2014年4月30日 · First off let me say hello. I am new here and new to BMW's. In fact this is my first bike with electric start! So, I have this 1974 R90/6 and I am trying to figure out some electrical issues. It has a 3 position ignition switch, off and 2 on positions. I have parking lights in the first on position but will not start.

2014年5月21日 · Taking a reasonably stock R90S of any year and modifying it with a later motor would be considered a mortal sin by many, but putting a hot rod 77 R100RS motor into the 74 R90S that you’re looking at just might be considered salvation instead. To bring that bike back to a nice R90S would take a big commitment of time and money.

2006年8月3日 · Numbers-matching R90S in excellent condition. A period correct rider but many details are not stock. Beautifully repainted and nicely enhanced. New pistons, valves, bearings, seals, gaskets, wires, hoses, cables, just about everything from end to end. It comes with a box of parts, mostly /6 era but probably some other airhead stray items.

2012年1月5日 · Wiring diagrams are year specific instead of model specific for this era. 1974 is R60/6 thru R90S. 1975 and 1976 are the same, R60/6 thru R90S. Then the wiring changes again in 1977 and again in 1978 and again in 1979-80. These changes may have not been much, I'm not sure. They certainly do share a lot of common traits.

2006年8月3日 · Numbers-matching R90S in excellent condition. A period correct rider but many details are not stock. Beautifully repainted and nicely enhanced. New pistons, valves, bearings, seals, gaskets, wires, hoses, cables, just about everything from end to end. It comes with a box of parts, mostly /6 era but probably some other airhead stray items.

2017年1月20日 · When naming different models to @tennessee thumper ’s Mount Rushmore the R90/6 is seldom mentioned but if there was ever a BMW Airhead equivalent to the Ford F150, I’ve got to nominate the R90/6, particularly the ‘75 and ‘76 models. Simply a solid, dependable workhorse of a bike.

2009年11月14日 · It'll be OK without them, but you probably won't notice any improvement in power. The R90S head is virtually identical to the R90/6, other than the different inlet stub. The bigger bang mainly came from the higher compression pistons. You may even find the Dells less easy to live with than the Bings . . . .

2010年10月30日 · 1974 BMW R90 /6 Rebuild & Modifications. Discussion in 'Airheads' started by fadingfastsd, Oct 30, 2010 ...

2010年7月5日 · my bmw service manual gives the following information: with engine warm and throttle fully open, compression readings (in atmg) are qualified as follows: good - above 10 (147psi) normal - 8.5 to 10 (125 to 147psi) poor - below 8.5 (125psi) these values are for r60/6, r75/6, r90/6 and r90s bobp