i have a 2000 cbr 600f4
21k miles yoshimura exhaust
kn filter
bike runs good just started a throttle bogg trying to take off
and has started losing power all around
wont lift the font tire like it used to lol
just changed the oil and cleaned and recharged the kn and it didnt help
any ideas

 

check compression.

Dirty carbs?

 

I've only felt my front end get light once... (chasing a liter bike). It certainly has never come up on me. How much do you weigh? I sortof feel my bike is lacking a bit of power too..

 

i figured out the issue with mine the plugs were shot they had a bright red tint on them
from what i have been told you are not asposed to run carb cleaner in it i dono
i changed the plugs i am running the autolights they were out of the ngxs at advanced auto
i changed the inline fuel filter
and the oil wile i was in there cleaned and recharged the kn filter
and it runs like a new bike

as far as the front tire man i have no issue as soon as it hits 9k it pulls up on me with no issue my weight is 185 it will pull and run threw second for a min pretty easy
i have had 3 99 00 model f4s kinda a fan and all of them would pull like this some more than this i am running stock gearing on this one my other 99 i had i dropped a tooth in the front and it pulled harder
all of them had a slip on the one i have now has a youshi. the others had d and ds they all had kn filters and stage one dyno jet kits
have u changed plugs latley what are you running aftermarket?