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Bike keeps dying

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Hey all,  I have an 03 Klx 400. My problem is it is hard to start and keeps dying. This just started a few weeks ago. The only thing I can think of I did different was to turn the petcock to the off position one day after riding(I. Or ally don't do this). The next time I went to ride it wouldn't hardly start and if it did wouldn't idle. Any thoughts?  Thanks!!

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Vacuum petcock?  Petcock vacuum line may need replacing.  If not pull the fuel line from carb and check fuel flow from petcock ON  or RES.  No smoking

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The PO installed an aftermarket tank so I'm not sure if the petcock is the original or not. I have pulled the gas line and flow is correct with the dial(on=gas, off=no gas). There is no smoke. thanks!

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