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I'm just about to put on a rear tire (ME888) and while I'm at it I am also going to pull swing arm/driveshaft off and re-lube. When the U-joint does not have any grease in/on it it will create a vibration. I have had a couple of Moto Guzzi's (still have one) and they were notorious depending on the day of the week and whether they were on strike, that many of the U-joints did not get lubed properly. That kind of changed with the V11 which had fittings to insert grease in although one was almost impossible to get to. Also since I used Guard Dog Moly (no longer in business-a shame) spline grease on the spline on the rear wheel it smoothed out considerably.
Have developed a thrrruummm at certain times - if I change gears I can make it go away. Feel it thru the bike as well. Sounds/feels like something rubbing while it rotates. Sounds a little like, when as kids we used to attach a piece of cardboard to the bicycle spoke to make noise. I had a Moto Guzzi throw a universal drive shaft joint , and I was picking up on it before it happened.
Head bearings and front wheel bearings recently changed.
Anyone had similiar problem 
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