I have to say this is the thread of the day for me. I too have been trying to figure out (again) the vibration - I managed to get it really smooth one time with all the screws at the front tightened to the specified torque. So this morning just before I went to sort this out I read this thread. First thing I checked was the bashplate. Voila! Both tabs toward the end of the plate were snapped off clean straight line. The vibration lessened but not to where it was, i.e. there is still some between 3.5-4.5 krpm (last time I even managed to smoothen that range out). I still have the factory engine bar-guard. Now I wonder if the vibration would lessen further if I take that off as well, any thoughts?

Now I wonder what to do with the bashplate. Most likely at best the dealer would replace with a new one, but the problem will probably come back. Am not sure if the dealer would give me money back though. Now, may be I will just reinstall the original plastic guard that came with the bike, or should I reconsider the Touratech large bashplate with toolbox option (which I know there has been a couple unsatisfied buyers), but may be TT has modified it to fit better? May be not? Mind you, I think Yam6 was right about the yamaha bashplate as I recall, he was one of the first who identified the weak (broken) points of the plate.

Suggestions?