Well i do have a F4i for over a year and i have Weird issue:
Issue was there when i bought it i cause i thought its easy FPR fix. Last owner told me issue came when he changed fuel tank filter.
Issue:
When i start it starts all good BUT i cant Rev it over 2500 until temp goes over 60 Degrees (Celcius). After its warmed up and riding under load like around 3000-4000 rpm it does same thing. Noise is like its cutting off or like theres a limiter or something. Its very frustrating and i dont know what to do anymore.
I have replaced Tank pump, new fuel filter, new FPR, New spark plugs, checked Valves. Checked TPS, checked MAF, Checked all lines like 1000 times. it has new battery and its charging all well. All exhaust pipes are warming up in same degree, Changed wax unit. when i checked plugs all are OK.

I am thinking can it be fuel injectors? but it doesnt make any sense why after bike is warmed up i can rev it to redline.

And im sorry about mine English cause it aint mine mother language.

 

ECM or injectors are you likely culprits as you seem to have discounted everything else.
How many miles does it have?

 

Well teated all injectors all are fine. Bike has 47k kilometers.
I thinking next could be ignition coils to look with new spark plugs. At the moment i have iridium ones will tey regular ones to see is there a difference. Sadly i can test only by buying parts… So if spark plugs arent problem then it must be coils or timing hopefully not timing. Its so irritating to drive with slow speeds its so junky and wait before going to drive wait until engine is least 50 degrees Celsius.

 

Get a spare plug, pull the ignition lead, fit to spare plug to it and place on the head, you will see if it sparks and can then rule out or not the coil on stick. Each plug has a separate coil on each lead.