There was a change for the 2010 (L0) models.
Max rpm rose from 8,500rpm to 8,950rpm
heavier duty, wider top compression ring to prevent piston flutter at high rpm and help transfer heat to the bore.
Final drive ratio went from 5.904 to 6.484
2011 AN400 ABS w/3500mi
I replaced the 18 gm stock rollers with 21 gm DrPulley sliders.
Mpg went from 52 to 57 in 50/50 city/hwy driving. Rpms at 80mph (indicated) went from 8000 to 6200 !!!
I weigh 240lb and have an extra tall windshield and large Givi trunk.
Good full range performance. 👍👍👍
I had a2008 AN400 that I
Equipped the same way. I feel that the 2011 model has more horsepower