i have a 1990 cbr600f and it lost power and it has a hard time going past 3grand it's not driveable if the throttle is pulled too fast it chokes out. the idle sounds a little off. it sounds kinda choppy when it's idling.

 

Pull the spark plugs and look at the colour of the electrode. If it is black and wet looking your bike is getting too much fuel, if it is white and looks like its been heated up (metal bluing) its too lean. But from what youre saying your bike is definetly not running on all cylinders.

 

pulled the plugs black and wet getting to much fuel thanks for the help.

 

no problem, pick up spome new plugs and clean your carbs before installing them