Yes, the "toaster" tank. Back when they first came out, the serious BMW riders didn't care for them, they wanted the larger tank. Today though, they're all the rage, lol. The "toaster" tank was a /5 thing only. The /6 had the same tank but just all painted, no chrome side panels. My 1st one was another "toaster", a '72 R75/5, sweet bike .....
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I sold it many years ago and only had that "conversion" for a while. Then I latched onto the /6. And I got to thinking I'd really like another /5, so I started looking. It took a few years but I finally found the red "toaster", and very close to me too, only a few miles down the road.
As you may have gathered, I used to be pretty heavy into the BMW "scene". It was my main bike until I got into the 650s. I was in the nationwide owners club and would attend at least a couple rallies every year. These bikes carried me across the country and back, and then all over the Northeast to rallies for many years. I always stuck with these old airheads though, I never progressed to a K bike or an Oilhead. BMWs are kind of funky but they definitely grow on you, lol. These older ones do have some maintenance "must-dos" but none of it is that complicated. And some of the design features are just marvels of German engineering, lol. Two that come to mind are the geared throttle assembly and the geared choke lever. Amazing designs that will last basically forever if maintained (greased). And the hand levers pivot on replaceable nylon bushings (about a dollar). The cables are nylon lined so don't need to be oiled, you just grease the ends where they hook up. There's lots more that I can clue you in to if you get one.