Long, vibration related, saga.
I bought a K7 Wee back in 2014 and went through it stem to stern. CA Winter Project
. Before I shut it down for its make-over I rode it 4-500 miles and it was very viby. I felt it in the seat, pegs, grips just like you. The mirrors vibrated at freeway speeds and were too blurry to use much. I did some research here and some riders install a 16T front sprocket to drop about 500RPMs at freeway speeds to reduce the vibes so I added that to my refurb list. When I got the bike running again it was still viby but less so on the freeway and it was my first V-Strom (or V-Twin for that matter) and I just learned to live with it as "normal". Since the bike had 80K miles I didn't think of the vibration as a problem.
About a year into running like this I was having trouble with the idle and some other issues and I dug into the throttle bodies. What I found was that the shaft seals and shafts were worn and leaking. It took a few tries but I was able to replace my throttle bodies with lower mileage TBs for a K9. Before I installed them I resynched the butterflies using the procedures documented HERE
. There is no field procedure for synchronizing the throttle plates and Suzuki says to never touch the linkage screws. Once I sync'd and replaced my TBs the vibes were completely gone and the bike ran smooth as silk.
Fast forward to April of this year, I sold the K7 and bought an L4 Wee that is, unfortunately, very viby so I am back to square one. Actually worse because it is more viby than my old K7 ever was. I did some research on Gen2 Wees and the general thinking is that some bikes coming from the factory are noticeably more viby than others, so perhaps that is true of the 2017's as well. I think that somewhere in a Suzuki or Mikuni plant there is some kind of flow-testing, measurement machine for synchronizing the throttle bodies. The measurement for setting the synch between the front and rear throttle plates has a precision of 0.03mm or 0.0012in which is fairly high precision. My hypothesis is that this machine is calibrated after synching so many units or after some fixed period of use. So if your TBs were synch'd right after calibration then your bike runs smooth if your TBs are synch'd just before the calibration you get a viby bike. Luck of the draw.
Purchased a 2017 2 weeks ago and have noticed an increase in vibrations in the seat mostly some in pegs and grips. Vibration in the seat is bad enough it becomes uncomfortable in my nether regions after 30 min or so.
Thinking a retorque of the engine mounts is a good place to start? Trying to decide if I want to bring it back to the dealer for this as they will probably just blow me off or do it myself.
I'd take it back and complain and see what they say. I agree its very likely they will just blow you off and say it is "normal" but maybe they won't and if you don't ask you won't know. FYI, I think the engine mounts require a special socket to retorque so you'd have to buy that for $50(?). As another poster recommended get the speed at which you are seeing vibrations as that is a big clue and can point to wheels or engine. My L4 has a peak vibe at around 5200RPM which I think is a primary mode for the engine. I am planning on resynching the throttle plates this Winter but I hate the vibes so much I might do it sooner, I will post my results if it works (or doesn't). The definitive test for your bike would be to swap out the throttle bodies with a known good set but I am not sure how practical that would be, especially on a new bike still under warranty.