BOTM Winner 05/15
Join Date: Nov 2008
Location: Brighton, MI
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Take the tank off, and drain it. You don't want to fire the bike up with a crap filled tank. Take the fuel pump out, clean the strainer, as that may be clogged.
Once off, get a gallon of CLR, and some stainless nuts and bolts. Pour a good amount of CLR into the tank, with the bolts. Shake the tank around, using the bolts to knock any loose rust of. Let it sit for a while. Pour everything out once you think it's clean. Pressure wash the inside, and let it dry. Once completely dry, grab some Por-15 or equivalent gas tank liner, and apply per directions.
If the top of the tank is like that, the rest of the tank is likely to need some attention.
"Logically, any motorcyclist can do 60* of lean. The trick is coming back up again." - Neal Spalding