I finally decided to get the bike out--long story why I haven't ridden in awhile. 1996 CBR 1000F. Bike starts, idles rough, but the main problem is fuel is pouring (literally) out of what appears to be an overflow tube originating (as best I can tell) between the #3 & #4 carbs. Overflow tube ends below the air cleaner housing and above the coolant resevoir. I'm guessing that one of the carbs is stuck and fuel is backing up, but there is a lot of fuel dumping out of this hose.

Any idea what the problem may be and, most importantly, how do I fix it?

Thanks in advance!

 

If fuel is dumping out all the time (running or not), the problem is the petcock on the tank.

If fuel only pours out when running, the problem is the carbs. Shut fuel off (duh), remove tank, pull back air box, remove carbs, remove float bowls, clean all 4 carbs (most likely float valves not sealing properly)

 

Yep. Most likely a float valve sticking or possibly a float filled with fuel and sinking.
It's really not that hard to remove the carbs on these bikes, which is a major plus.
You should try removing them from a magna V4.
It makes the CBR seem like a walk in the park with a hot chick.

Here's what you're looking to do:

These are the carbs once pulled and sitting on the seat:



Here's where they need to come from:




Here's the carb bank:



Here's a pic of a float (the white thing). What you want to do is remove the floats (pull the pin that holds them in). When you pull out the float, the valve will come out with it. What you want to do is clean the float valve and shake the float to make sure there is no fuel in them. In order to "float" they can't be full of liquid.
Also, you will want to check the float heights and set them to spec. All you do is measure the height and then bend the tabs on the float where they contact the valve stem.
Looking at this picture, you can really see what could be happening with your carbs. The fuel flows from the tank, down through the little float valves and into the bowls. When the fuel level in the bowls gets high enough, it pushes the float against the valve and stops the flow. If the valve sticks, the flow continues and then fuel runs out the vent (the plastic "t" in the top left of the picture).




If you need any help, shoot me a PM. I can give you some pointers if you like.
Also download a manual if you don't already have one. HERE is a download.

 

Thank you! PM on the way with some follow up questions.

 

Question #1, Where did you get that screwdriver?
Question #2, When did Craftsman start making orange screwdrivers?
Question #3, Does that orange Craftsman screwdriver come in a set with other orange screwdrivers?
Question #4, What do you think would happen if you used some of that WD-40 (in the first photo) on that orange screwdriver?

 

He did thats why it is orange...

 

Do you mean on the rust or the handle?

Poor guy just tries to help somebody and look what happens...I love it here.

 

Nice photos Dyl. Anyone reading this thread now will only think of Orange screw drivers.
I think what everyone seems to have missed here is the highly unfashionable yellow and red plug arrangement in the foreground. How could you? That's just so tasteless. Yeuch!

 

donles316,

I feel I must apologise for the disgraceful behaviour of a few members hijacking this thread just to pay out on one of our mods...

So Henry, what are we calling it? 8 or 9 out of ten for content, but only 4 or 5 for composition? Would've been higher from me except for the blue bag next to the red fuel container then the yellow bag or rag thing . He'll probably ban us in a minute as soon as he's done playing with some spam.

 

LMAO! I love it. It's about time you stiffs started having some fun.

That goshdam orange screwdriver got me again, didn't it?
Ya know, I just bought a brand new set of craftsman screwdrivers on friday, too.
Seriously, I did. That particular one spent a good bit of time in the yard thanks to the kids. (they probably needed a pointy implement to help them destroy something else of mine.. lol)

Check this out! Nice and shiny!




Yeah... what now about my screwdrivers? And they've all been treated with Eezox to keep them from rusting.

Oh, and to keep this informative.... the rifle shells at left are used to adjust the "D" shaped A/F screws on the carbs. 5.56 NATO is the best caliber. Simply bend the business end into the "D" shape, screw them out, then hit the screwheads with a dremel to carve a notch for a regular flathead screwdriver.

I can assure you that multicolor is "in" here in the states.

I thought the "GO AWAY!" welcome mat was a nice touch myself.