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Author Topic: Removing Spot welds from a Gas Tank  (Read 1737 times)

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Offline gwallis

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Removing Spot welds from a Gas Tank
« on: February 06, 2017, 01:51:02 pm »
I have a 1977 CB400F Super Sport gas tank that I want to remove the hinged mechanism for the gas cap lid.  There are two areas that I want removed... the hinged area as wells the metal locking piece.  These areas are fixed to the tank using spot welds.  Four altogether.

What is the best way to remove the spot welds without damaging the metal directly underneath?
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Offline calj737

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Re: Removing Spot welds from a Gas Tank
« Reply #1 on: February 06, 2017, 01:52:12 pm »
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline 754

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Re: Removing Spot welds from a Gas Tank
« Reply #2 on: February 06, 2017, 01:57:51 pm »
He does not want to go thru..that leaves grinding..
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Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline gwallis

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Re: Removing Spot welds from a Gas Tank
« Reply #3 on: February 06, 2017, 02:04:42 pm »
A small amount of grinding and then body filler is expected.  Just do not want to drill into the tank itself.
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Offline calj737

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Re: Removing Spot welds from a Gas Tank
« Reply #4 on: February 06, 2017, 02:05:47 pm »
Quote from: 754 on February 06, 2017, 01:57:51 pm
He does not want to go thru..that leaves grinding..
They do not if you use them as directed.
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline 540nova

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Re: Removing Spot welds from a Gas Tank
« Reply #5 on: February 06, 2017, 02:46:21 pm »
Eastwood sells those, as well.


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Offline innovativems

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Re: Removing Spot welds from a Gas Tank
« Reply #6 on: February 06, 2017, 03:46:22 pm »
Spot weld removers are amazing. Just take your time


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2007 KTM 990 adv
2003 Honda RC51
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1978 Honda Express
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1974 Honda CB350f
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1971 Kawi h1
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Offline 754

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Re: Removing Spot welds from a Gas Tank
« Reply #7 on: February 06, 2017, 05:56:22 pm »
Once they are off, then what is the plan ?
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Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Rocky2010

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Re: Removing Spot welds from a Gas Tank
« Reply #8 on: February 06, 2017, 06:08:40 pm »
Just grind the plate down till you get to the tank material, the plate should just fall off or just with a light tap with a hammer and it shouldn't damage the tank material.
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Offline gwallis

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Re: Removing Spot welds from a Gas Tank
« Reply #9 on: February 06, 2017, 08:01:10 pm »
'The Plan' is to eliminate the lid that covers the interior gas cap.... paint and then add a chrome gas cap to complete the look.

The scalloped area that currently surrounds the gas cap will give it a different look... different but pleasing.

If you have ever seen and touched the cover it is very flimsy and cheap.... and it protrudes above the tank... not flush like the CB550 super sport.
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