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03 will only start with choke on?

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I have an 03 450 that I am getting ready to sell. I took all the plastic off and air filter out and took it to the car wash to clean up the air box and other areas hard to get to. Now with the bike back together it will only start and run with the choke on. Anytime you take choke off it dies anytime you try to give it throttle it dies. The only other things I did were check valve clearence and take off the header to clean it up. All timing marks line up with lobes on cam pointing back. Also yes the intake tube was blocked to prevent water from getting in and my choke knob also wont stay out anymore since i washed it. You guys think moisture got in the carb? Any ideas? Thanks

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