it's super easy to simply remove the tank entirely, remove and clean the petcock while it's off and flush the tank thoroughly, you may want to put new gas lines on as well. It's an 05 so you may want to consider adding a small filter just after the petcock and before the carbs to keep her clean.
Be on the lookout for the red inside tank paint from the factory, there are a lot of posts regarding a red powdery stuff along with small medium and large flakes of paint inside tanks clogging the petcock screens.....if you do flush the tank, do it through a tshirt or other filter medium just to catch the residue and look it over.
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