The only change was oil, from Mobil 1 R4T to Delo 400. Its not inconceivable that they weren't installed 100% from new, but they still exceeded their nominal service life, they're a 150 hr item in the manual and went at 180 hrs, my bad. The camshaft has a concave ramp on valve opening and must be very hard on the followers. I still have the bike and it doesn't get much use, but now at 820 hrs total and the bearings are still the ones I fitted back then, along with a new camshaft because I stuffed it letting them go too long. The bottom is 100% original, even the clutch plates. I did fit a new piston at 100 hrs because a valve seat let go, so head job too at the time. So with an incremental 640 hrs, the replacement roller followers bearings are now over 4 times their nominal life and the only change was the oil at 180 hrs. Not scientific and a sample of 1, but has convinced me of the merits of Delo 400. One theory was that the maybe slightly less slippery semi synthetic forces ball/roller bearings to turn rather than skid, but I can't confirm. Unreliable and Husabergs don't go together in my experience. My 2007 FE650 still hauls too and its all original except for a couple of water pump seals @ 325 hrs. Delo 400 from the beginning!