So this just started happening recently. All will be good until about 10-15 min of riding. Then say sitting at a light/traffic, when trying to take off it will stumble a few times but once moving in the higer rpm's it drives perfect. When the bike is not fully worm it runs perfect. The idle also gets quite spuratic when idleing in traffic. Around the city the temp will be around this area.

It dosnt really seem to matter if its 100 or 70 outside.
On the freeway the temp stays a hair under the middle spot.
Here is the vid of the idle, notice at th end it dips quite a bit. Once again, once moving its perfect. Any ideas?
http://s46.photobucket.com/albums/f1...t=SSPX0574.flv

 

Having this SAME problem at the moment. I flushed my radiator because it would start getting hot when just sitting. If I sit long enough it will start bogging down because it gets so hot. Its even bogged down till it killed a couple of times just sitting.

 

well im new to the cbr world and from my experience and my searching around,
The hesitation is a very common thing only does it when warm, keeping the idle 1400-1500 seems to help alot.. As to the Heating up man im lucky enough not to have it at the moment and where i live its 100d..
one thing to check is to see if your Fans are coming on?

 

Ya fans kick on.

 

Without going into detail it sounds like one of your spark plug coils has gone bad and acts up when the engine is hot. The only way to pinpoint this problem is to unplug 1 coil between running the engine in a shop environment and if there is no difference than that is the one that has gone bad and needs replacing. Probably a good time to change all 4 spark plugs,do a coolant flush and pinpoint the bad coil. Best of luck.

 

Already did the plugs, did it before and after. Coil, never thought of that, runs great when upper in the RPM's. Right now i have the carbs off cleaning them. I did notice the valves are really gummed up/carbon. Should i spray something on those to clean them?

 

I've noticed the same problem with my F4 when I'm sitting in traffice and its hot out.
I'll have to do some checking to see if that is it.
How much do the coils cost?
Should I change my spark plugs before winter, or just wait and change them before it gets nice out next year?

Det99cbrf4 - How long did it take you to clean your carbs?

 

Way too long, i have atleast 6+ hrs into it. Quite a PITA. Im still not done, will be done tomorrow.
Carbs are mounted back on just a few vac lines im un-sure of where they go. I also have a new air filter on the way as well as sea-foam. New plugs are in.

BTW i dunno if im just ****, but i went through 3 cans of carb cleaner too :]

 

I am having this problem at the moment also. Exactly to the T. Mine seemed to start after I installed my Speedohealer and filled up the tank with 89 octane. I was using 92 octane before. I'm pretty sure it doesn't have anything to do with the Speedohealer, but it's easy to tell if the gas is causing it. Next fillup I am going back to 92 octane to see if that fixes is. Out of curiosity, what kind of gas are you running?

I just had my carbs cleaned and sync'd.

 

SinceI have had the bike I've ran 93 or 94.
I was always under the impression that due to the high compression of the engine it required the higher octane.
But from what I've been reading on here, seems like thats just an urban legent.