Ie something that is still a BM but with a lot of weight chopped and much upgraded suspension on it......And a bikini fairing and dropped (slightly) bars....
It would be fun though playing with the suspension to get it right - with the shaft drive too... if you get the 65s they are twin shock, so perhaps less choice around but cheaper.... The 650 engine is narrower and wont fit parts from the rest of the BMW range, so parts supply is harder. The R45/65 arent nearly so interchangeable.... The gearbox is identical, but frame, tank etc were quite different. The R80s are more likely to be ex police so may well be shagged out.... But you could get a monoshock one which handles much better...
They are very easy to work on and reliable, so you could just buy one and bend the cylinders up?? Or just become part of uncivilised guzzi society.... (if you arent already).
Seriously though, if you end up doing one like that I would be very interested to see how it goes.....
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