cbr f3 running a little slow

[Bike_less]

hey guys i have a question i have a cbr f3 that i just had tuned up and it runs really well when the bike is cool but after about 15 min it starts to run poorly. i also put a kn air filter when i did the tune up and i also did a valve adjustment the bike does have a yoshimura slip on pipe if that makes much of a difference alright thanks for your help guys
David

 

[Bike_less]

c'mon guys nothing no ideas???

 

[ALANRIDER7]

It sounds like it's running lean.

Jet kit?

 

[Bike_less]

how hard is it to install a jet kit and how do you know which one to get ??

 

[elskipador]

i'm with alan....its running lean. why is it that everybody thinks you can drop a k&n in a bike and its good to go with no other changes. IT ISN'T !!! jet kit usually run about a c note. you could always just put the stock filter back in

 

[Bike_less]

lol i am very used to working on cars which k and n's are just a drop in thing how hard is it to install a jet kit?