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motor issues maybe? help

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ok i have a 2006 DRZ400sm with a full yoshi, jet kit, 3x3 mod and 8,800 miles. i bought it about 2 months ago, put 1,000 miles on it and have had no issues with it. recently at high RPM the bike seems to cut out like it gets no fuel. i pulled the carb, clean everything, went through the vacuum system for my fuel, and took the petcock apart. nothing seemed to do anything. the spark plug looks good.

 

The motor makes almost a whistling sound when i rev it to high rpms, has anyone seen this or heard of this or maybe can lead me to a solution.

 

could it be my valves? stator? anything electrical?

 

 

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A California bike will of had a vapor recovery system.  Is it intact or removed?  The gas tank vents via the recovery system.  If removed, how is the tank vented?  See if it truns better with the gas cap loose.

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It has been removed, I ran a line from the the tank vent down by the rear spring, I have tried to run it without the gas cap and it doesn't run any better

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