My R100RT has a vibration problem as well, as soon as I go past 130kmh it starts to buzz, up to 140 and it starts to smooth out again. I had the top end rebuilt new pistons big ends and little ends and conrods balanced, carbs rebuilt and balanced. Crossing the nullarbor with four other BMWs and they sitting on 130 was a pain in the butt right in the buzz zone! I have spoken to a few others that have the same problem, my bmw only mechanic said that there are a few he has come accross with the same problem, and thinks there may have been a harmonic problem with a batch of crankshafts from the factory. I just have to put up with it until I do a full engine rebuild and get the crankshaft assembly balanced together.
Rob...
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