Motorcycle Repair: Bike dies after a mile or so, honda cbr f4, diaphragm valve

Question
Hello,
I have a 1999 honda cbr F4. when I ride my bike acts like it isn't getting enough fuel. it doesn't matter how hard I ride her, after about a mile she starts to jerk a little and then stops giving power. when I try to start her back up I turn the choke all the way up and usually she'll start back up unless I rode her too hard just before that, then I usually have to wait a few minutes and try again. sometimes when it dies if I leave it in first it will almost stop and the rolling gets her to start back up again. if while I am riding and she acts up and I pull in the clutch she will automatically die. also, if I ride for less than a mile and come to a stop and then ride again and come to a stop I can ride for a long time. I've checked out the carburetor and ran a cleaner through it several times. when I took it apart everything was clean a looked great. I've also replaced the fuel pump and the air filter. I am at a total loss b/c I would have definately thought it would be either the carbs or the fuel pump. could it be the power relay or the fuel cut relay? Thanks so much in advanced
Michael

P.S. I'm just a college student so taking her to the shop can be very pricey for me and so I like to try and do most things on my own.

Answer
Micheal.... these things are not really my specialty at all. Never worked on one or owned one. I went to the PARTS FISH site and checked the illustrations as much as I could.
I see a throttle position switch on the carb bank plus an air cut diaphragm valve mounted on the carb rack, so hope that those items are all okay. They shouldn't affect the bike to the point of dying out completely, though.

If your bike has a petcock valve, there is a screen up inside the fuel tank that could be clogged. The fuel tank, screen and petcock passages must all be clean and clear at all times.  The fuel tank has to vent somewhere or allow air to be drawn inside the tank to prevent vapor lock. It you have a way to run the bike until it dies, then pull over and remove the fuel cap then try it again, the problem may be found there. I would assume that the cap would give a whooshing sound when removed indicating a vacuum in the tank. The tanks generally vent fumes to a carbon canister or purge valve system, assuming that your bike still has the OEM smog equipment on it. If that has all been stripped away, you will have to check the whole thing over for vacuum leaks and be sure that the fuel flow isn't getting blocked from either vacuum or a physical source.

The fuel cut relay could be at fault, too. Check it with a 12v test light to see when it activates and when it shuts down again. I think it activates to fill the carbs, then shuts off until the engine is running again.

Here are some links:  http://www.cbr600f4.com/links/links.php

Bill Silver