I had a new professionally done coating dissolve after half a year, oddly it completely dissolved and went right through the engine and out the pipe. For a while there I didn't have a reserve, but it came back all on it's own. It was very odd. The coating was a cherry red. The tank is clean now although you can still see some red around the cap.
(imagine a cute or dirty tagline here)
On Tue 09/08/11 9:45 AM , "Paul" paul_probus@yahoo.com sent:
> 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 Hon
> da-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&g
> t; > > > 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/> >
> > >
> > >
> > >
> >
>
>
>
>
> ------------------------------------
>
> 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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