I thought that might be what it was, too, but I have come to the conclusion that it was most likely not it. The entire tank was not covered, the upper part has rust, the lower part was almost pristine metal under the gunk. The color of the gunk in liquid form was close to the color of the 2 stroke oil that I was using. I have come to the conclusion that after 15 years of sitting and evaporating, the gas/oil mix turned into a pretty bad gunk. I suspect that the oil in the gas may have made the problem worse than had it been gas alone, but I have not started on my C70 tank to see if there is much of a difference (both bikes have been sitting the same amount of time). Also, while I have read about a tank coating that is reversable (I think it dissolves in MEK, but forgot) I think the fact that the coating was dissolved, albeit at a moderate pace (about middle of the road of the solvents I tried), by kerosene and carb cleaner would indicate that it was dried gas/oil, not a coating.
If it was a tank coating, afterall, then it likely was the one part stuff. The two part epoxy based coating should hold up for a long time. At least I hope so since neither bike is going to a new owner for a long time. :)
Paul
--- In Honda-C70@yahoogroups.com, gandalf@... wrote:
>
> That old gunk is probably an old tank coating like your considering putting on. I don't think I'd recommend any of the tank coatings. Clean the old tank well and keep gas in it and you should be fine.
>
> (imagine a cute or dirty tagline here)
>
> On Mon 08/08/11 9:23 AM , "Paul" paul_probus@... sent:
> > I have not de-rusted, yet, but I have been working on an old Free Spirit
> > Moped with a tank that was all gunked up with evaporated fuel/oil. That
> > gunk was coming off in sheets and yet there was still a lot left to keep
> > clogging the fuel outlet (no "petcock" I jury rigged some plastic
> > tubing to the fuel outlet and put a ball valve in). I eventually found,
> > through experimentation, that brush cleaner worked about the best for
> > removing the gunk. I found that much of the lower tank where the most gunk
> > was built up had no rust under the gunk, but did flash rust after I drained
> > out and washed out the tank after the brush cleaner.
> > I will probably de-rust both that one and my C70 tank this winter and coat
> > both with one of those two-part epoxy tank coatings. They seem to be more
> > durable than the Kreem or other one step coatings.
> > Paul
> >
> > --- In Hon
> > da-C70@yahoogroups.com, "Jon"
> > wrote:>
> > > I did the electrolysis method. Works great! Gets
> > tons of gunk out, but takes quite awhile. But if you don't coat it
> > afterwards, it will just rust again. Happened to me. And this time the rust
> > was in fine powder form. Turned all the gas orange and clogged the carb. I
> > just let it pass and eventually it cycled out. There is now new rust in my
> > tank and I figure, let well enough alone. When my tank was full of rust,
> > the gas still came out clear - probably the rust was caked on so well.
> > >
> > > But for just rust removal, electrolysis works
> > great! I used this guide here. >
> > > http://www.altelco.net/~jacil/clay/motorcycle/KElecSetup.html>
> > > After my failure at electrolysis, I tried this
> > method http://www.rusteco.com/. It didn't work for me. No
> > idea why, but I was very unsatisfied with it. Maybe I didn't do it right,
> > who knows. >
> > > I've heard that molasses is also good for rust
> > removal, but never tried it.>
> > > Actually, I recently lost a bid for a like new
> > 81 C70 passport tank on ebay... So sad, but I wasn't about to fork over 90
> > dollars either. Someone else did though. Check and recheck ebay frequently
> > if you ever hope to find one - probably the only place online since the
> > part is discontinued and most OEM online catalogs dont have it in stock.
> > Also check Ebay UK, they also had cubs there. If you have a smartphone, the
> > ebay app is a godsend. >
> > > Good luck!
> > >
> > > -Jon
> > >
> > > --- In Hon
> > da-C70@yahoogroups.com, "Jean Luc Picard"
> > wrote:> >
> > > > Electrolysis can clean the rust from the
> > tank, but I'm not so sure about evaporated gas gum...> >
> > > > --- In Hon
> > da-C70@yahoogroups.com, Chris Bader wrote:> > >
> > > > > Hi
> > > > >
> > > > > I mentioned the wrong product in
> > earlier post. It was evapo-rust that was used for tank
> > cleaning> > > and the Berryman's was for cleaning
> > the carb. There are a number of different products and
> > methods> > > used.
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > >
> > > > >
> > ________________________________> > > From: holdendr44
> > > > > To: Hon
> > da-C70@yahoogroups.com> > > Sent: Wednesday, August 3, 2011 1:57
> > PM> > > Subject: [Honda-C70] need new gas
> > tank> > >
> > > > >
> > > > > ÂÂ
> > > > > I need a new gas tank for a 1980 C70.
> > It was my step-father's and has been in storage for 19 years. Would
> > appreciate any help I can get. Thanks.> > >
> > > > >
> > > > >
> > > > >
> > > > > [Non-text portions of this message
> > have been removed]> > >
> > > >
> > >
> >
> >
> >
> >
> > ------------------------------------
> >
> > C70 Passport Not Running Right?
> > 1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw1970-73 C70 Troubleshooting Guide:
> > http://tinyurl.com/6ebwtw (scroll to sec.7.1 page
> > 101.jpg)1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c1980-81 C70 Troubleshooting Guide:
> > http://tinyurl.com/hu42c (scroll to sec.18-1 page
> > 170.jpg)1982-83 C70 Troubleshooting Guide:
> > http://tinyurl.com/hu42c (scroll to sec. 20-28 page
> > 205.jpg)
> > 1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn61982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
> > More resources for C70 Passports and Cubs:
> > http://www.shlaes.com/Vehicles/Scooter.htmhttp://www.velodrome.com/HondaC70/HondaC70.htmlYahoo! Groups Links
> > To visit your group on the web, go to:
> > http://groups.yahoo.com/group/Honda-C70/
> > Your email settings:
> > Individual Email | Traditional
> >
> > To change settings online go to:
> > http://groups.yahoo.com/group/Honda-C70/join(Yahoo! ID required)
> >
> > To change settings via email:
> > Honda-C70-digest@yahoogroups.com Honda-C70-fullfeatured@yahoogroups.com
> > To unsubscribe from this group, send an email to:
> > Honda-C70-unsubscribe@yahoogroups.com
> > Your use of Yahoo! Groups is subject to:
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
>
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html
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