My Experia eats head bearings. I have just 30,000 miles on it and installed my 4th set of tapered roller bearings over the weekend.
The Stockers gave up the ghost at ~9000 miles. Energica replaced them under warranty since they shouldnt wear out so fast. Couldnt get the part from Energica, because reasons, so I went with a BMW part that is the same spec. Those bearings gave up the ghost at around 20000 miles. Decided to go with SKF bearings and had them replaced at the South City Service Center. Figuring I had eliminated the variables of both inferior quality (SKF is top notch) and ham handed installation ( maybe the tech at the dealership was having a bad day) so our own Demoni pushed the SKFs in, again under warranty. Those gave up last month at ~ 30,000. Getting warranty work is tougher these days so I invested in the specialized tools needed and did it myself. At least with my bike, it looks like head bearings are a 10000 mile consumable.
Some Experias just do that. 2 others others have complained of the same thing on social media. Still trying to figure out why.
My front end was really stiffly sprung. I had all the preload dialed out and still couldnt get enough sag. There is a hunch that many miles with a too stiff, long travel front end can act like a hammer on the bearing races. I had the forks serviced and they took about 45% of the interior preload out. Hoping to make it soft enough that the external adjusters can get it on the nose. We'll see if I'm replacing this set in 10,000 miles.
The best source for the bearings, believe it or not is Napa Auto Parts. Part # BRG BR32. SKF Tapered Roller Bearings. 28x52x16. somewhere in the neighborhood of $40 each. You'll need two. BMW part #31427663941 if that works better for you. Those are around $100 each. Other stores have the same size bearings for as little as $18 each but they are not SKF, or All Balls or any other brand you should trust in your bike.
If you stand next to the bike, on the left side, you grab the frame on the right side and lean it over on the kickstand to get the front wheel off the ground. With the front wheel in the air sweep the bars, gently, left and right. If it feels like there is a notch or detent at close to straight ahead the bearings are needing to be replaced.