Question about 1984 Honda CX 500 B

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Rust I'm sure most of you have heard of this way to remove rust in a tank... putting a steel or iron piece of metal into the gas tank so its suspended in just the electrolyte liquid and connecting a positive battery cable to the iron or steel rod and the negative to the tank... my question is this: I have a nighthawk, so the gas tank isn't only composed of steel... theres a little piece at the bottom that holds on the fuel guage float and it looks to me like that piece is made of bronze or some sort of copper alloy... if I leave that piece on, will doing this damage it?

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SInce you can remove your tank fairly easily, take it to a radiator shop--they can blast clean and perma seal for about $50. Or try PORs solutions, for about 50.. Rusteco's citrus is repeatedly commented as THE BEST solution, at $250 per 5 gallons, it's expensive, but can reuse again and again--get 5 locals with rusty tanks together and get a 5 gallon bucket of the stuff, and since your organized it, keep the left over to do on another tank someday

Posted on Mar 21, 2009

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You will destroy the softer metal. Don't do it

Posted on Nov 20, 2008

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I have a1996 model Gravely 16hp twin cylinder that has given no problems since it was new. I started to crank it today and it was hydrologic locked. I removed the plugs and left it clear itself out. Put...

1. If it has a metal tank, then it may have rust in the tank which is getting into the carb(s). Look in the tank and see if there is any rust at all. If it has rust then a tank liner kit should be installed like "Kreem". "Kreem" or other brand liner kits are sold at most motorcycle shops.

2. The carb could have trash or rust in it. Remove the carb inlet line and blow litely into the inlet hose.

3. It most likely hydrolocked because the carb bowl overflowed when the trash or rust made the needle and seat stick open. The rubber breather tube shot out most likely because the vapors in the crankcase ignited or there is to much oil and gas in the crankcase now. Once the carb overflowing is stopped, the oil should be changed.

May 03, 2014 | Motorcycles

1 Answer

Rust in gas tank

Not much you can do for this problem. The acid that attacks rust is phosphoric acid. and will be a starting point. IF the rust is flaky put some sharp edged pebbles in it and shake hard to help remove loose rust. (like sand blasting by hand). Use no other acids as they will attack the metal and not the rust. The stronger the phosphoric acid concentration the better. Can be obtained from large hardware stores as a rust converter.

Aug 16, 2013 | 1999 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

How to remove a gas tank on a 2009 keeway f-act 2 stroke 50 cc scooter.any solutions out there brother had it for 2 yrs and now the tank is full of rust.

Thanx man.....but the bike tank i finally got off and i rinsed it with gas and quarter sized pieces of rust r coming out..and wen i look inside,the whole tank is covered in rust....i was hoping there was something i could put in it to remove it.......thanx buddy

Apr 07, 2013 | Motorcycles

1 Answer

When off gas is leaking

1. remove the hose from the carb and see if the petcock is shutting off the gas and if not clean, repair or replace the petcock.
2. look in the tank and see if it has rust in the tank even a small haze of rust as rust will cause the needle and seat to stick in the carb and make the gas leak. If the gas tank has a lot of rust it may need a tank rubber liner kit added or even a new tank to stop the leaking.
3. if the bike has been sitting for a while it may have trash in the fuel system(carb/petcock/tank). Rust or any trash can cause a leak. Properly clean out the carb and fuel system and add a new filter when done.
4. Improperly adjusted or bad needle/seat or float in the carb will cause continual leaking. Replace the needle/seat/float and adjust the new one when installed. Check your service manual for float adjustments.

Jul 22, 2012 | 2002 Honda CR 125 R

4 Answers

Motorbike sitting in shed unused for a year. Chrome has little rust spots all over. How may I get the rust spots off without damaging the chrome? I live within about one kilometre of the ocean and at times...

you'll need some steel wool, use fine if the rust is not bad. No need to scratch the metal too hard for nothing.
Second you'll need some metal polish to lubricate, and polish while you rub with the steel wool. Liquid polish works better..
you'll need a clean rag to buff out everything after you've removed the rust.

Rub the metal-polish-loaded steel wool on the part until you see the brown rust pits vanish. Don't do a circular motion, go in a back-and-forth motion instead to match the length of the part. Circular scratches will show even if they are very small.
Once you've made all the rusty spots go away, take your polishing rag, a clean cotton t-shirt can do the job, and buff the piece until you are happy with the result.
You can always finish with a regular application of metal polish without the steel wool after you're done.

Nov 08, 2009 | 1996 kawasaki VN 1500 Vulcan Classic

3 Answers

How to clean a fuel tank after years of storage

Remove the gas valve assembly. Get a cupful of 1/2" nuts from the hardware store and put them in through the gas cap. Add 1/4 tank of kerosene or other "slow to burn" solvent. Put the cap back on the shake the metal nuts all around inside the tank. The nuts will abrade the rust and gunk so you can get the tank nice and clean. I suggest you then use a liquid tank liner. Google kreem products as a source. Now the tank will never rust again and you will get clean gas.

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Sep 29, 2009 | 1983 Yamaha XS 400 Special

1 Answer


Probably a plugged up filter screen in the gas tank petcock (gas valve). Drain the gas then remove the petcock and clean the wire mesh filter. Your bike is getting old and rust accumulates in the tank. You may want to get a liquid tank liner to lock the rust in place and so the tank won't rust anymore. Install an in-line fuel filter as well. A site for the tank liner is below.

Google kreem fuel tank liner “ or go to www.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Apr 21, 2009 | kawasaki Z1 Motorcycles

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