I am having issues with my f4, when at slow speeds the bike runs great but once at speed and the ram air pressurizes the airbox it seems like it leans way out and spits and sputters and does not run well at all. I took the ram air tubes off and runs great now. I was wondering if anyone had any suggestions on what I can look for to fix this issue? The bike is stock with a scorpion slip on and a new oem air filter.

Thanks!

 

Has the bike been jetted?

 

did the problem start as soon as you put the new filter on?

 

Bought the bike with the problem and I am not sure if it has been jetted or not.

It is a California model if that makes any difference

 

Hmm found this link.. It has some good information I will be taking a look into!

CBR F4 High-speed Issues