I changed the tires before winter, had the wheels aligned. I check pressure every weekend. The bike vibrates when still so the wheels are def not the cause.

Forks have been serviced a couple of months ago (changed the bearings, oil, etc). This improved it just a little bit, can feel there are less vibrations in the front.

I checked everything I could check without taking the bike apart and it seems in order. I suspect the culprit is the engine not siting right on the frame but dont know how to proceed.

At low rpms it feels like a normal mono but everything above is bad, and if I go way up in rpms it feels and looks like my bike is going to fall apart.