stuttering fzs 600

[clayt74]

Hi,
my fazer 02 has just developed what sounds to be a very similar problem.
it starts fine and runs fine around town as long as im very gentle and smooth on the throttle.
as soon as i try to give it some beans it stutters/judders around 6k rpm (it almost feels like your trying to accelerate in 3 gears too high) the bike does pull through it and then feels fine but have lost confidence in overtaking.
The thing for me is this problem started just after i had given the bike a real good hosing down, so I am assuming that my prob is almost certainly the caps ( I have just pulled them all off and sprayed with WD40 but wont get to ride until after work to see if it fixes the problem)
I would definately start with caps before taking the carbs apart.