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The way to do it right it to take the fuel tap out then plug that hole up with a cork, then take off the gas cap (make sure the tank is empty and dry). Now put on you chemical resistant gloves, eye protections and a respirator if you have one. dump a bunch of muratic acid in the tank, fill it 3/4 up. You can get muratic acid in 1 gallon jugs for cheap at hardware stores and pool supply stores. Sit there and swirl it around, you will notice the tank become extremely clean, it will start to look like new bare metal, you want to do this utile it is completely clean. If there is any rust it there it will clog your filter or your carb up latter. After it is all clean drain the acid out, then wash the tank with water. After that you can use this stuff called kreem (available at most motorcycle shops), it will coat the tank so it never rust again. I don't use kreem, I just give the tank a nice coat of WD40 if I do not plan on using it immediately. This is the way most all people in the motorcycle world do it (trust me, I'm on 3 motorcycle digest, and frequent 5 other motorcycle BBS's, and have done it to at least 4 tanks). The alternative is have it done professionally, but it's usually not worth it, muratil acid works just as good.20 Scott Corsaro
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