Hello everobody,

Recently I had an accident with my 99 Cbr F4, in fact, it was burnt till the very frame.To make long word short, I found trashed F4I with only front forks an frame damaged and swapped everything to my frame.Several days ago I had it started. it works fine, beside one problem.That is where I need your help.

When firing the engine it automatically revs up to 4 000 rpm and does not come back to normal idle setting (as far as I know F4i has automatic control of idle revs vs f4 wheer you could control it by hand).I stopped the engine by that time and then started it again. In second case it was stuck to 1500 rpms, it went up but never came back to normal.

Does anybody have any clue where should I be looking for the problem?
some relay? maybe coolant sensor? anything that you have in mind.

Thanks in advance for patience

Hope you will help me bring my baby back to life from ashes

 

f4i also has an idle control on the left side near the shifter.

 

u probably need to adjust your idle screw, or maybe you have some problems with the throttle cables/spring

 

could be a few issues... check for vac leaks... 4000 on start up is about 1000 high for cold start... and as someone stated after it gets warm you adjust your idle adjustment if you can't lock in on a target idle and you have no vac leaks try syncing the throttle bodies then if that doesn't help might need to crack the wax idler open ..... you have a service manual... i know i might be missing a couple other causes...someone else will come through with more to add

 

I have been away for a day an already there different advice, Thanks Guys You are really helpful.

i will be checking what you wrote.
BTW I have only F4 Manual not F4i, I will be searching the net, but anyways if anyone has any direct link, throw it in here,

Thanks again

 

Ok, found it, here is the link if anyone is interested like me
https://cbrforum.com/forum/f4i-main-...manual-123975/