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Old 02-23-2007, 11:09 AM   #1
Nightwing
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Default Rust In Motorcycle Gas Tank! Help Me Fix It!

Ok. MY neighbor has a scooter. He said if I could give it a tune up, he's give me his other scooter as payment. this is the scooter:



It's a motorized bicycle. only goes 25 at max with the motor on. IF you're sick of pedaling you switch the motor on. really cool. So here's the problem. He's been storing it for months without any gas in the tank. It's full of rust. Bad. And the tank is part of the frame. So I cant remove it.

I've been told to fill the tank with distilled water and sand and shake the frame for a long time, to let the sand actuall agitate the rust off. sort of like wet sanding Iguess. Then to srain the tank, and flush it with gasoline to clean out any remaining sand. Than it would be good enough. BUT...I don't want the rust to keep getting worse.
What's an easy way to stop the rust? I don't have a ton of money to throw away on this little bike, but it would be fun to get it running and not have the tank eat itsellf apart from the inside out.

Any suggestions people?
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Old 02-23-2007, 11:12 AM   #2
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Hang on, there's stuff for this...let me find it.

Here you go: http://www.eastwoodco.com/jump.jsp?i...emType=PRODUCT
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Old 02-23-2007, 11:15 AM   #3
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^ I know there's a rinse out product, but I don't know that Ican afford it or that I want to spend that much time on it.
I'm just looking for methods that people might know of, that are fairly simple.
I don't even care if ALL of the rust is out of there. I just want to know if there's a way to treat it so it won't get worse.
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Old 02-23-2007, 11:16 AM   #4
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Quote:
Originally Posted by Nightwing View Post
^ I know there's a rinse out product, but I don't know that Ican afford it or that I want to spend that much time on it.
I'm just looking for methods that people might know of, that are fairly simple.
I don't even care if ALL of the rust is out of there. I just want to know if there's a way to treat it so it won't get worse.
It's $30!
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Old 02-23-2007, 11:17 AM   #5
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might be worth it. it's a vintage scooter so....tell me more. please say it's not a total pain in the ass to use!
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Old 02-23-2007, 11:22 AM   #6
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You add the rust remover, also a length of chain can help here. Agitate the tank and cleaner, rinse, add wash, rinse, add sealer, let dry, done.
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Old 02-23-2007, 11:24 AM   #7
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where do Iget this stuff? what's it called?
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Old 02-23-2007, 11:30 AM   #8
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Just use A and B NO LINER! It will come off and you will have chunks of plastic in the tank.
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Old 02-23-2007, 11:34 AM   #9
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Quote:
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Just use A and B NO LINER! It will come off and you will have chunks of plastic in the tank.
chunks of plastic? explain. I want to do this tpoday and am waiting on some advice to leave my house and buy whatever I need to do this. so...more info please people! thanks!
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Old 02-23-2007, 11:37 AM   #10
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make sure to add some inline filters. I had one of those when I was younger.
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Old 02-23-2007, 11:43 AM   #11
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You want to do this today?

Just go to your local auto parts place and see what they have, short of that, get some Muriatic acid from Home Depot, slosh the **** around with a chain or some gravel and rinse well with water.
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Old 02-23-2007, 11:51 AM   #12
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Quote:
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chunks of plastic? explain. I want to do this tpoday and am waiting on some advice to leave my house and buy whatever I need to do this. so...more info please people! thanks!
You can get Kreem at most motorcycle shops. Just get the Part A (acid) and the part B (neutralizer). They sell Kreem liner and it is horrible it is a liquid plastic that coats your tank, but it will flake off. Once you have used part's A and B just make sure to leave the tank full when it sits ( A teaspoon spoon of oil after the first fill up can help too). Gas is a natural rust inhibitor. I had a old sr250 that sat in a field for over 15 years. The tank filled with water and rusted really bad. I used Kreem and the rust was gone and never was there a trace of rust in the tank after 5 years of use. People use rocks, bb's, ball bearings all types of things to get rust out of tanks, but all the bike guys I know swear by Kreem. Good luck
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Old 02-23-2007, 11:58 AM   #13
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If you want to do this right, you are going to need to drop the engine and take as much off the frame of the bike as you can. Looking at the bike, that looks like a 3 hour job, tops.

Then use the eastwood product, or give the tank to any garage that does tank de-rusting. Be careful with gravel and chains, you don't want to break the tank baffels if there are any in there. Also, as skinny as that tank is, you would have a bitch of a time flushing out the gravel.

Do it right, or you will have problems down the road.

Zach
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Old 02-23-2007, 12:01 PM   #14
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If you want to do this right, you are going to need to drop the engine and take as much off the frame of the bike as you can. Looking at the bike, that looks like a 3 hour job, tops.

Then use the eastwood product, or give the tank to any garage that does tank de-rusting. Be careful with gravel and chains, you don't want to break the tank baffels if there are any in there. Also, as skinny as that tank is, you would have a bitch of a time flushing out the gravel.

Do it right, or you will have problems down the road.

Zach
You're no fun!

Good point, forget gravel...but a length of chain lowered in might help, leave some of it out so you can hold it and not let it drop in might work.
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Old 02-23-2007, 12:02 PM   #15
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For the time being.....since gasoline is a rust inhibitor, would it be safe to fil lthe tank, shake it up really good to break any loose rust off, and then drain and re-fill the tank? I mean..it won't get any worse if it's full with gas, right? Just put an inline filter on it, and then I can get it running, and then this summer I can strip it down and take the frame to a show to have the rust treated?

Does that sounds reasonable at all?
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Old 02-23-2007, 12:18 PM   #16
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Quote:
Originally Posted by Nightwing View Post
For the time being.....since gasoline is a rust inhibitor, would it be safe to fil lthe tank, shake it up really good to break any loose rust off, and then drain and re-fill the tank? I mean..it won't get any worse if it's full with gas, right? Just put an inline filter on it, and then I can get it running, and then this summer I can strip it down and take the frame to a show to have the rust treated?

Does that sounds reasonable at all?
You want to get the rust in the tank neutralised. It will keep rusting, even with fresh gas in the tank. The rust will create micro pockets and trap air.

Also, with an old tank, it probably has a lot of sludge in the bottom. That sludge, even after rinsing a few times, is going to clog your fuel filters for a long time.

If you just shake it up with fresh gas, I'd start riding with new filters and a pair of pliers in the tool bag. You are going to need them, or will be using the pedals pretty often (and probably at the base of a long steep hill to... Murphy is a bitch).

Zach
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Old 02-23-2007, 11:05 PM   #17
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Also the top speed on these is not 25mph as I had mine closer to 50 mph. Depending on engine condition. Parts are nearly impossible to find.
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Old 02-23-2007, 11:16 PM   #18
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i'm confused... i don't see a motorcycle anywhere?
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Old 02-23-2007, 11:24 PM   #19
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that thing is pimp!
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Old 02-24-2007, 02:36 AM   #20
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it's a scooter. but i need info from guys that know rusty motorcycle tanks. beech!
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Old 02-24-2007, 09:14 AM   #21
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Done several rusty tanks from several old hondas:

1: turn tank upside down and shake out any loose crap
2: handful of pea gravel (pea gravel works beast, as the round stones will break off rust flakes, but not fall apart and leave little gravel bits in the tank)
3: fill halfway with gasoline
4: shake the bejeezus out of it
5: drain the rusty, gravelly, gasoleeney mess out the filler neck
6: fill halfway with gasoline, shake, drain - repeat until the stuff out the neck comes out clean.
7: install two decently sized inline filters on the fuel.
8:keep the tank as full as possible to inhibit further rust.
9: enjoy - I drove a 75 honda 550 after this for three years - never had to change the second filter - just kept it full as often as possible.

Obviously the above will be a tad more difficult as your "tank" has an engine and wheels on it, but you can handle it right?

To snag such a pimp ride, you must be a manly man, no?

BTW, that's a moped. Motorycycle>Scooter>three speed bicycle with banana seat>Moped
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Old 02-26-2007, 07:45 PM   #22
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To snag such a pimp ride, you must be a manly man, no?

BTW, that's a moped. Motorycycle>Scooter>three speed bicycle with banana seat>Moped
LOL! IT was free. I own 2 motorcycles, and my wife owns a scooter. This was free, and it'll be fun to putt around the neighborhood on.

you're a weenie! hahaha
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Old 02-26-2007, 07:46 PM   #23
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Quote:
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LOL! IT was free. I own 2 motorcycles, and my wife owns a scooter. This was free, and it'll be fun to putt around the neighborhood on.

you're a weenie! hahaha
So its still b0rked?
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Old 02-26-2007, 07:58 PM   #24
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i rreaalllly recommend POR-15

Works the best!

Or get some rust converter at hardware store
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