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fuel line problems

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Here is the deal, I have a 06' CRF450X street legal supermoto. When I am running down the road at 5,000 rpms the fuel line starts to run dry. (clear fuel tube)

I have checked the fuel filter and even removed it! All the carb vents are not clogged (blown out with air) the float is set correctly (10mm like it says in the book) The petcock is free from debris. The fuel line just seems like it is becoming "air locked". It will do this even with the gas cap removed! And when I return to idle is takes forever for the line to re-fill (if the carb does not run dry first!)

WHAT IS THE DEAL!

I noticed when I ride off road (rough terrain, on and off the throttle) the problem does not occour

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I figured it out, I removed the fuel valve and ran a line straight from the tank to the carb and no more problems. I am going to build a mount for a ball valve to use as a fuel cut-off.

I took apart the fuel valve (stock) and it's no wonder enough fuel can't folw through there the valve is a pancake or as I like to call it a "smiley face" design. It just can't keep up with the demand of 1/2 throttle for 5 min. on the street. I don't know if the R models have this problem because it is a different valve (no reserve) possibly the orfices are bigger.

:D

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was there a rubber washer in between the valve and the body?? maybe the washer was turning with the valve as you opened or closed it?

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