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So my factory Dunlop front tire started showing some wear, so I decided to replace it with a Michelin Pilot Power 2ct.

I rode it home and at 150+ mph the front started shaking, a little at first then really bad as the speed went up. I took it back to the dealer and they said everything was good. I took it out again and it's still doing it, pretty much all the time, sometimes it's not that bad and other times it is.

Any idea what it could be? It never shook when I had the Dunlop on it, and as far as I know they didn't change any suspension settings or anything...

 

[Stock]

Okay, so I did a 150+ mph run today and it seems like it might just be a contact patch/different tire thing...

It started to shake a little til I loosened my grip on the handlebars, then it went away. It's probably because the Pilot Powers are a lot narrower than the Dunlops, I could tell that as soon as I pulled out of the dealership by how much easier it turned...