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2011 AN400 ABS, 2008 AN400 (previous)
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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. 馃憤馃憤馃憤
I had a2008 AN400 that I
Equipped the same way. I feel that the 2011 model has more horsepower
 

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You may well be right on that power difference. Bluebottle noted this in this thread.
I'll let smarter folks explain the real world impact, but might make a difference at higher speeds.

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. 馃憤馃憤馃憤
I had a2008 AN400 that I
Equipped the same way. I feel that the 2011 model has more horsepower
 
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