Hi i have my f4i 2003 with 27000 km , and i have a trouble when i open throtle my bike doesen"t(response) accelerate in second ,mostly after 1 or 2 seconds, i have K&n filter but i put fabric again some people tell me to do, i have sport exhaust, i change FPR and new sparks NGK imr9c-9h,
some with similar trouble or opinion, and i don"t have any MIL or errors blinks on my display.

 

theres possibly a small black rubber piece blocking fuel from
your fuel pump. looks a little bit like a cap but thin. I had the exact same problem. I took it to honda
because I got frustrated with trying to find the problem. I forgot
the name of the piece but thats more than likely what it is. they
only charged me $60 btw

 

Do you remember if it was part of your fuel pump or where it was located? And how did this cap thing get there? just curious

 

Can you show us that part if you see here
OEM Parts : Babbitts Honda Parts House

 

I honestly can't find a picture nor do I remember what they said it
was called. I would take it there and tell them the problems your having
and they should know right away. At least my dealer did. Sorry I
couldn't help as much.