I have a 2004 F12X and after ridding for an hour or so hard it starts flashing "F1" or "FI" i cant tell if its a 1 or I. it causes the engine to loose RPMS and not run as fast. any help would be great!
I had this issue on my F12X and it turned out to be a sticking waster gate. The FI indicate a Fuel Injector issue which was not the problem in my case - it was a very big distraction since I thought I had an intermittent fuel injector and spent a lot of time swapping things around!
Make sure the waste gate moves easily and lube it after each use.