For the last 100 miles or so, the engine seems to be vibrate much more under acceleration. I didn't feel it at all before that, and it's got me concerned. Doesn't feel nearly as smooth now. I'm assuming it's engine related. Any ideas?

 

What bike? What engine? What has been done maintenance or accessory wise in the last 100 miles? What mods are applied to the bike?

 

Little short on the details. What kinda bike, mileage, mods, year, etc.

 

2013 FXS Blackline w/ 103" and 3200 miles. Only mods are V&H short shots and Fuel Pak, but all done long ago.

 

First logical thing to check would be engine mounts; could be loose or defective.