August 18th, 2022, 07:18 PM | #1 |
ninjette.org member
Name: Peter
Location: Northeast
Join Date: Jul 2022 Motorcycle(s): Ninja 250 Posts: 10
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Gas Tank
Hello again, (this is getting pretty annoying ). So came to the conclusion I bought a dud of a bike. It has given me nothing but headaches. Anyways, my gas tank is leaking from the top left bolt hole area. It is a fairly serious leak. I’m assuming a bolt got jammed in too far? It seems pretty impossible to find a new gas tank online so am wondering if anyone had any ideas to seal the tank? I’m assuming I’ll have to rip off the threaded spot to find the hole. Thanks
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August 18th, 2022, 08:50 PM | #2 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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yeah, two different size bolts to hold fairing onto tank. Longer one goes on bottom where there's nothing behind. But shorter one is required for upper hole as there's only about 5mm of thread. Put longer bolt in there....
I've found with age of these bikes and numbers of previous owners, half of whom are below average, that most tanks have been punctured. Out of previous 8 pre-gens I've restored and sold off, about 3/4th had punctured tanks. Don't even think about JB-Weld! That stuff has caused more crappy repairs on cars & motos than anything else. IT WILL NOT WORK BECAUSE THAT CRAP IS NOT PETROL PROOF!!! I've found it's easiest to drain tank, let sit outside for a day, then rinse with soapy water gets it ready for welding. Then I braze some brass into puncture hole (positioned flat so hole is up & down). I give it a little extra heat and brass slides to bottom of hole. Let cool and hole is plugged with metal!!! Actual time spent is about 15-min. Most of that is sanding and cleaning to prep that hole! Last futzed with by DannoXYZ; August 19th, 2022 at 10:57 AM. |
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August 19th, 2022, 07:24 AM | #3 | |
CPT Falcon
Name: J.Emmett Turner
Location: Newnan, GA
Join Date: Apr 2009 Motorcycle(s): '08 CP Blue EX250J, '97 unpainted EX250F, 2nd '97 unpainted EX250F (no engine), '07 black EX250F Posts: A lot.
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Quote:
What about JB TankWeld? It's gotta tolerate petrol since it's supposedly made for fuel tanks and such. I found some at the salvage store and bought it because I have a punctured EX250F tank in storage somewhere. Sure enough, I searched and this dude was using it to fix the exact same issue (language): https://www.youtube.com/watch?v=QfpTUxLGCjM I always intended to restore mine by inserting a headless set screw with a shorter bolt in the same hole, maybe with something like JB TankWeld smooshed between them. Unless there is a gap between the threaded hole and the tank rupture, I expect it to work. Does the brazing method leave you with no hole for mounting the fairing? |
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August 19th, 2022, 10:57 AM | #4 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Sure let's try the TankWeld! Can't hurt.
Brazing puts the brass at bottom of threads. Leaving you with top 5mm threads to use. Have to add a little extra heat so it flows downwards. Just matter of technique. |
1 out of 1 members found this post helpful. |
August 22nd, 2022, 04:02 AM | #5 | |
ninjette.org member
Name: Tev
Location: Ireland
Join Date: Aug 2022 Motorcycle(s): 2004 E250 Posts: 18
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Quote:
Get a cheap syringe and try any layer some inside the thread hole 6-8mm deep, let it dry hard. Then syringe some more in to a depth of around 5mm. Before it drys make sure you have depth for the screw and run it in to its normal depth to push the Marine Weld back. Then run marine weld around all four sides of the raised bracket sealing it completely. Run a wet finger around to make it neat and smooth. Job done - I did the very same thing and punctured my tank a few days ago. JB Weld Marine Weld does a brilliant job. |
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2 out of 2 members found this post helpful. |
September 3rd, 2022, 02:55 PM | #6 |
ninjette.org newbie
Name: Dave
Location: Haslet
Join Date: Sep 2022 Motorcycle(s): 2007 250R Posts: 1
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I had the same issue, but the previous owner had used something to block the leak. I didn't see it until I removed the fairing. Ended up paying $570 for the repair...but no more fuel leak.
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