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It would take some fab work.

The most narrow tank is from a CX500C. Although, they can be a real bugger to find. When one is found you'll need to spread the wallet wide. And the tank will likely need repair from rust, dents, paint.....etc.

Remember, a smaller tank will hold less fuel, so your range will be impacted.
 

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Cut off wheel, steel, mig welder...design and build your own tank on the GL500 tunnel.
 
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Hows it compare to a cx650tank???
Theres raw aftermarket cx500 cafe tanks with 650 mount kits available on ebay from time to time...
650 front kits are a few plates, bolts and rubbers at the front mount....
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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It would take some fab work.

The most narrow tank is from a CX500C. Although, they can be a real bugger to find. When one is found you'll need to spread the wallet wide. And the tank will likely need repair from rust, dents, paint.....etc.
You're thinking of the Standard/Deluxe tank that everyone wants for his café racer. The Custom tank should be easy to find, with so many being replaced.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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The tunnel will be the biggest challenge, given the GLs wider triple spine frame.
If you do try a CX Custom tank, go for a '79 or '80. For the 1981 model, Honda narrowed the tunnel to increase capacity.
 

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1981 CX500C
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@Randall-in-Mpls Don't know about the CX tank being "easy to find"...

I had to replace the tank on my '81 CXC. Searched for 4 months in 2011, spent $150 (+ shipping) for a tank with dents and minor interior rust. Considered myself lucky on the find. Many CXC tanks were in much worse condition for insane prices.

I'm pretty sure any tanks for these rides will be getting very scarce. The few found will likely have some level of damage and severely overpriced. Kinda like everything these days.
 

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I'll be trying both on the euro I recently bought.

It came with a custom {aftermarket Benelli Mojave} tank that fits the frame fairly well but the fuel tap wants to occupy the same space as the side frame tube.

I have standard CX and 500C tanks here I will be trying soon.

Some years back I briefly test fitted a standard tank to a euro and it looked doable.
 

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@Randall-in-Mpls Don't know about the CX tank being "easy to find"...

I had to replace the tank on my '81 CXC. Searched for 4 months in 2011, spent $150 (+ shipping) for a tank with dents and minor interior rust. Considered myself lucky on the find. Many CXC tanks were in much worse condition for insane prices.
I'm pretty sure any tanks for these rides will be getting very scarce. The few found will likely have some level of damage and severely overpriced. Kinda like everything these days.
The custom tanks are by far easier to find than a standard or deluxe. The prices for them coincides with the supply and demand also. The standard tanks sell for stupid money with rust holes and all.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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I test fitted Standard and Custom tanks on a GL500 frame once. I think they could be made to work, but might sit a little high.
 

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The custom tanks are by far easier to find than a standard or deluxe. The prices for them coincides with the supply and demand also. The standard tanks sell for stupid money with rust holes and all.
On the silly money topic....todays ebay...USA seller...ignore the $100+postage...

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1982 Honda GL500 cafe build in progress . Burn rubber , not your soul !
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Discussion Starter · #15 ·
I test fitted Standard and Custom tanks on a GL500 frame once. I think they could be made to work, but might sit a little high.
I've not popped my clip ons on yet because they may not have enough clearance, I've seen the clip ons on the cx500 but I think the gl500 interstate has a bigger tank.. I could be wrong. The main reason I want a tank swap is to turn my clubmans down so it gives it a slicker look , if the clip ons clear it ill stick with the original tank until I start my build this winter... I've got to.many ideas to count with limited loot.
On the silly money topic....todays ebay...USA seller...ignore the $100+postage...

View attachment 215935
Holy hell !!!!!! That an insane amount if money !!
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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Your best option might be an aftermarket café tank. They can be a lot narrower than stock.
 

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1982 Honda GL500 cafe build in progress . Burn rubber , not your soul !
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Discussion Starter · #17 ·
Your best option might be an aftermarket café tank. They can be a lot narrower than stock.
I've been looking for a tank.. I think I've found one that'll button up with no fab work.. the Mojave tank , here's the link.

 

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I just bought a euro that came with that tank. Unfinished project.

The euro has pretty much the same frame as the GL.

The fuel tap wants to be where the left frame rail is.

I'll be using the tank on an early single spined CX.
 

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1982 Honda GL500 cafe build in progress . Burn rubber , not your soul !
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Discussion Starter · #19 ·
I just bought a euro that came with that tank. Unfinished project.

The euro has pretty much the same frame as the GL.

The fuel tap wants to be where the left frame rail is.

I'll be using the tank on an early single spined CX.
Sweet!! I'll check out .
 

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1982 Honda GL500 cafe build in progress . Burn rubber , not your soul !
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Discussion Starter · #20 ·
I just bought a euro that came with that tank. Unfinished project.

The euro has pretty much the same frame as the GL.

The fuel tap wants to be where the left frame rail is.

I'll be using the tank on an early single spined CX.
You wouldn't happen to have a link for one would ya ?
 
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