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Post by mattybeckett on Apr 12, 2017 13:26:14 GMT 1
Can anyone recommend someone who can repair petrol tank' there are only 2 tiny pin holes which are the problem, tank is rust free inside and it seem the problem started as little stone chips. I don't really want to use a liner as heard bad reports about them flaking off in time. Look forwards to your advise. Cherrs MB
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Post by JonW on Apr 12, 2017 13:58:58 GMT 1
sounds like a couple of spot welds once the tank is cleaned out... tho you dont say if you want to try and keep the paint intact or not...
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Post by crazydave on Apr 12, 2017 14:09:30 GMT 1
Sorry to upset your apple cart, but.....
The pin holes would not have started from the outside.
Most mechanics have inspection cameras these days.
Take it to your local friendly (armed with beer), and ask if they would have a look inside of your tank. Hopefully it's not too bad.
My tank didn't look too bad from the outside, until I tried to wipe solder and then tried to braze it......
NOTHING will stick to corroded steel. In the end, I cut out a section of tank and fabricated piece to braze into tank. Don't know about the UK, but a product called KBS Gold is a good product available in Australia and did a good job on my tank.
Try and track down a (good) local sheet metal fabricator and let them have a look for you.
A patch repair and lining the tank shouldn't cost too much, and last well.
A specialist would be able to open then tank and make it like new, but you might have to sell both testicles to have this done.
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Post by mattybeckett on Apr 12, 2017 14:13:28 GMT 1
Not to bothered about the paint as i can get the bottom half blown in after repair. Thought brazing might be the best bet.
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Post by mattybeckett on Apr 12, 2017 14:16:02 GMT 1
Had a look inside tank with my snapon camera and it's mint. Definitely started from the outside.
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Post by crazydave on Apr 12, 2017 14:28:45 GMT 1
OK then, is it a 83-85 YPVS tank???
If so, I'll buy you a cheap and nasty Indian copy, and do you a swap :-)
Find yourself a good sheet metal master. These tanks are paper thin, and are easily screwed up by careless tradies.
I am sure someone will recommend a place for you to send it to.
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Post by risolc on Apr 12, 2017 18:03:28 GMT 1
If you google tank repair then stotfold engineers come up-DO NOT ASK THEM TO REPAIR IT😡😡😡😡😡😡
I did and regret it.
Bite the bullet,save up and go get new one from Norbo.
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Post by mannanan on Apr 12, 2017 19:18:55 GMT 1
Sorry to slightly hijack this thread but it is tank related. I hear lots of reports of the early LC tanks rusting, leaking, etc. Anyone know if the later shape F2 tanks are less prone, more prone, or about the same? Is the metal paper thin on all of them? Thanks.
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Post by JonW on Apr 12, 2017 22:26:53 GMT 1
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Post by JonW on Apr 12, 2017 22:27:52 GMT 1
If you google tank repair then stotfold engineers come up-DO NOT ASK THEM TO REPAIR IT😡😡😡😡😡😡 I did and regret it. Bite the bullet,save up and go get new one from Norbo. Norbo isnt doing ypvs tanks... yet... c'mon norbo, what's the timescale on these??? |
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Post by mattybeckett on Apr 12, 2017 22:56:36 GMT 1
 Looks like a liner is the best option Maybe? |
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Post by mattybeckett on Apr 12, 2017 23:07:02 GMT 1
Picture of inside tank..  |
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Post by JonW on Apr 12, 2017 23:26:24 GMT 1
Strip the rest of the paint off the bottom and see if theres anything else like that, i could be localised and be welded or bazed etc
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Post by crazydave on Apr 13, 2017 1:22:57 GMT 1
I agree with jon about stripping some more paint off, but your tank looks so good, I would only do suspect areas.
If it was me, I would repair it with high grade silver solder. It is much the same method as bronze brazing, but melts at a much lower temperature. Done properly, you wouldn't even notice the repair, and is far superior to lead solder.
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Post by JonW on Apr 13, 2017 1:55:06 GMT 1
The paint and old rust is actually surprisingly good at holding fluid as i found in the link above, hence why id want to really look at the bottom edges after a wire wheel. Anything holed will show up as black dots. Eg:  The biggest of these dots actually survived about a month of rust eating solutions in the tank, which gas off and pressure the tank, before it failed and leaked fluid out. I then spot welded it. Im always amazed everyone runs scared of spot welding on tanks... Obviously you dont do em with fuel vapour in them LOL! Ive done quite a few now, maybe im missing something obvious but its worked really well for me. low settings on a mig make nice spot welds in the thin steel and you can even run beads if needed so long as youre careful. Dimple the area first so any protruding weld doesnt need too much dressing back (its so easy to remove a layer off the already thin tank doing that). People often say, 'but i dont have a welder', yet i doubt they have the tools/gas for brazing either if they dont... I tried soldering a tank twice in my life. Once with a proper old school soldering iron you put in a fire and lead solder. Heated it on the gas ring and wiped solder across the hole in the tank. It was a CB400N and it worked, but it was ugly and I wasnt convinced it was a real fix. 2nd time was more recently and I heated the tank and tried to flow silver solder, I just couldnt get the tank hot enough (cos its a huge heat sink) with MAP gas and really needed a proper setup... but i already have the MIG welder beside me. 15mins later its back on the bike holding fuel. nuff said. This one of mine might be a little more of a challenge... this also held fuel and only came to light when removing the liner with MEK (horrible stuff).  Its worse underneath I found by wire wheeling it. I reckon its had it really, but I might attempt to make a repair section up and have a go, nothing to lose with early ypvs tanks so scarce... Anyway, previously that tank had been lined and the rusted out 'line' you see here was formed as water sat on the top of a large slab of liner, under the fuel I guess. Paint and rust and filler allowed this to hold fuel for many years... scary. |
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Post by brg1200 on Apr 13, 2017 13:54:54 GMT 1
I recall many years ago kicking over my RD350R (the Brazilian model) and the bottom of the tank just split, gushed cold petrol down my leg.
I have seven RZtanks in the shed, only one genuinely holds fuel, unfortunately it's the one that looks like it had a fight with a cricket bat.
Three bikes, seven tanks (the search for continence), only one good one.
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Post by headcoats on Apr 13, 2017 20:20:47 GMT 1
It's screaming POR 15 tank liner I reckon  |
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Post by steeley on Apr 13, 2017 20:36:27 GMT 1
Oh yes, we are going to see a lot more of this . with modern petrol rotting the tanks from the inside out . time to pull myself together and get some serious Tig tuition under my belt and start making some tank repair plates.
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