I have the exact same thing. Was told it was harmonic but feels like the Spyker is vibrating apart. Have to get out of that rpm range.
Going into the shop and asking to look into it again.
Did you ever get it fixed.
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My new (two days ago) 2016 F3 Limited SS has this about 70 - 75 mph, seems more when backed off. Nice to know that it is apparently a normal phenomenon, but will check out an anti vibration device as it is annoying.
BRP is coming out with a belt tensioner for the f3s... :thumbup:
Amen... :thumbup:
Discussed this issue with some folks who race those big cars, begins with N..... who must remain anonymous, but their thinking was this is clearly a design defect and should at some point be warrantable. The vibration is so severe, I cannot ride between 68 and 76 mph, thus on the Interstates, as this is about the traffic flow, it creates a safety related issue.
My suspicion is that when dealt with effectively, BRP will come up with a solution and it will not be something which will cost the owners.
Have your belt tension checked: I'll bet that it's looser than the specifications call for... nojoke