To take out the tank you need to undo just one bolt , and the wire that connects it to fuel meter , and the fuel line from below . Take it out , remove the tank cap assembly fully , usually you need one allen-key for this , get the size you need beforehand . Remove the fuel petcock . Clean all . Drain as much as possible from tank by upturning it . Wash insides with detergent then water and dry in the sun for a whole day ( some water shall stay inside even after turning over ) . Clean the carburetor and replace the fuel line . Refit everything back . Quite easy , although a bit time taking , but no other way to do it either . And do hurry - that water is rusting your fuel tank's insides right now
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