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They make an emulsion kit for coating the inside of a fuel tank. Just check with your local Parts dept. You must drain and remove your tank and prep the inside of the tank with sandpaper or I have found that a 12" - 18" extension for a drill and a wire brush work the best. Then use mineral spirits or something along that line to flush out the inside of the tank and then make sure you have cleaned out the rust as best as you can, be careful the wall of the tank is not all that thick, then use the acid to clean out the inside of the tank again. This will prep the inside of the tank to adhere to the coating. Then pour the emulsion coating into the tank and roll the tank around coating the entire insides of the tank. Let dry I suggest a good 24 hours but follow the instructions of the kit. That's it. Good Luck
If there is rust inside, you need to buy a new tank. Best bet, go to the junkyard and get one. As far as getting it off, you need to take the bracket bars that hold it up. They go across the gas tank. Once they are off, if needed, locate remaining bolts on the edge of the tank. It will then come down.
1) Drain the tank, blow it dry using compressed air, and get all the rust out that you can. Use an acid wash / rinse to help remove the rest of the rust. Coat the tank inside with a tank sealer like that from kbs-coatings or caswell.
2) Have a metal shop make you a new tank that will approximate the old one.
3) Install a fuel filter that will catch the rust particles (left over after blowing it out) and be done with it
4) Use an external fuel tank (marine comes to mind) instead of onboard fuel tank.
possibly **** in your tank which has blocked your jets in the carb, clean out tank and fit an in-line fuel filter and clean carbs, imports often did this due to rust inside tank, if its bad take off tank and put in an old bike chain with some oil and shake the **** out of it, flush it out and drop an old speaker magnet inside tank to colect any rust in the future then fill it back up with fuel
Remove the tank and try for a better tank from a salvage yard ( Google " motorcycle salvage honda " and " Vintage motorcycle parts honda ").
Get a new gas tank from Babbitts. Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. $270 to $650 depending on year.www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
Personally, the tank liner is low cost and works extremely well. Tank removal is an involved effort. You would be well served in getting a service manual for the bike. With the manual you can do more than just fix the tank. One oil change and the manual pays for itself. Now you can do a whole lot more than just an oil change. Google "service manuals honda" or try your local library. Often guys will donate manuals to the library. You can also go to www.repairmanuals.com and probably purchase a manual there. THow about a top rating for this answer? Thanks!
best bet would be to drop the tank and clean it out they tend to get rust inside the tank when they sit this long if you decide to drop the tank and find rust inside take a 3 ft piece of heavy chain and shake it around inside the tank to loosen all the rust and clean the rust out really well before putting the tank back in