yar there is a factory defect with yamaha junoon: is ko nazar boat jaldi lag jati ha 2 weeks ago someone complemented me on the bike and was saying how nice,big and solid the bike fuel tank looked and after that bike started missing there is a lot of kachra in the fuel tank i had it cleaned by tanki specialist but to no effect .....there is no other problem as if you connect the bike with bottle of fuel then the missing stops had the tanki cleaned by tanki specialist once and learned how to do it my self then did it my self but to no effect one mecanic is saying that change the tank but price of orignal is well above 4k and i cant afford that. researched on internet and came to conclusion that there is one effective way which is electrolysis method of removing rust. but i dont know if any one has done it before in pakistan and am scared on attempting on my own as internet doesnt mention the disadvantages here are a few comments on another website that i found usefull and am posting here to see if someone could make the process simpler for me if someone has done this before I have seen so many opinions on this that I can only offer what I have learned by really thinking about the problem from a chemist's perspective..
For the best way to clean your tank,you really should know what kind of dirt is inside it. I have cleaned one automobile tank,one farm tractor tank, Two motorcycle tanks,and I have a PERFECT 35 year old tank from a CB500. It is really important what condition the tank is in before you start.
If your bike is a beater bike,with a rusty tank and you really do not care if it holes through after you clean it,by all means use whatever harsh chemical will do the job and the faster the better! If you want to use the most gentle method,I will describe it as going with electrolysis. If you have a nearly perfect tank with little rust and very nice paint,even electrolysis can ruin your efforts.
There are two kinds of problems. one is rust,and one is varnish. I usually go after the varnish first because varnish will coat the tank and the rust in the tank,making the rust more resistant to being removed by any method, electrolysis included
The cheapest way to remove varnish is with lacquer thinner. It simply dissolves the stuff into itself [dissolves into solution], and what does not completely dissolve turns into soft jelly. I get mine at a Sherwinn- Williams paint store for 15-20 bucks a gallon. Let the stuff set for several days,and it will not hurt the tank at all. Nice if you can afford enough to completely fill that tank.
Make sure that you save what comes out of the tank, because you can use it over again. I let all the gunk and rust settle and just draw off the clear [amber by now] liquid that comes to the top.
Electrolysis with laundry soda [not baking soda] as the electrolyte worked really well for me. It worked very well because I was working only on the rust and not a bunch of gasoline leftovers. Keep in mind to use a manual battery charger and a steel rebar works well to attract the rust,but when the reaction stops,you must clean the bar and just keep using the solution in the tank. Even when I covered the outside of the tank with heavy grease,the trail of foamy bubbles that came out of the tank washed the grease off and left a whitish stain behind, and that is what to watch out for. 5 thousand miles and three years later,no rust has returned. Note that I did use oxalic acid to convert the bare metal to a blue/black coating.
Now about my pride and joy Cb550 tank that has darn near perfect factory original paint. I will use lacquer thinner first to clean what little gunk was left behind with gas and Stabil in the tank, in there 21 years, and perhaps a mild solution of toilet bowl cleaner [about one-10 ratio] to loosen the rust if any is present.No foam,no drama, filled to the top---just get it clean as possible without risking the paint. Many rinsings,dry it with shop vac exhaust, and then a treatment of oxalic acid that will convert what rust remains to an inert coating. Dry it again with the shop vac
There are postings, YouTube videos,and gobs of stuff about electrolosis that are available by searching the net. No need to repeat it here.
Tank electrolysis maybe the way to go. Its very cheap and cleans perfectly. You need a car battery charger for this (or any other high amp charger)
First you pour water in the tank and add alot of salt. Then put a metal rod in the water inside the tank. The rod should not touch the tank on the inside or outside. You can use wood to hold the rod in place, without touching the tank. Then you connect the positive wire to the rod and the negative wire to the outside of the gastank. After 48 hours or so, it looks like you made tomato sauce inside of the tank, thats the rust that has been removed disconnect everything and rinse the tank with some gasoline.
There is a residue (black/grey, its called hematite) on the inside of the tank, you clean it by filling the tank with a slightly acidic liquid (even lemon juice works). After that you keep rinsing with water, until its clean.
Electrolysis rust removal - motorbike fuel tank
Removing rust from a gas tank - MopedWiki
Removing rust from a gas tank - MopedWiki