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Auxiliary Fuel Systems Have you added an Aux fuel tank to your ST? Post pics and a description here.

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Old November 19th, 2008   #1
zldrider
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Default Instead of a passenger seat or tail-dragger aux tank...

Has anyone thought to have a professional expand the stock tank?

I have a friend who had that done to his BMW GT and it works very well. A bit expensive but...
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Old November 19th, 2008   #2
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Default Re: Instead of a passenger seat or tail-dragger aux tank...

Joe - It's been tried but there is so little room for the bars that the pay back in increased gas does not seem worth the cost.
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Old November 19th, 2008   #3
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Default Re: Instead of a passenger seat or tail-dragger aux tank...

Who says that you have to expand it up, why not sideways a bit and have it hang over the side tupperware a little?

Another possibility I pondered way back in 2003 was to expand the bottom tank back into the rear wheelwell area - basically replacing the top rear fender piece of plastic with a long, thicker tank.

Gravity would feed fuel from that "extension" into the bottom tank which would then be used much the same way as the current main tank.

Might be kind of hard to remove the bottom tank unless you connected the new one similiarly with a large hose instead of welding them together.

You wouldn't be able to make this "third" tank very thick of the tire might impact it when the rear shock is compressed but, I would be willing to bet that you could make it thick enough and long enough to hold 3 gallons or so.

Just food for thought...

Probably be easier to make a tail-dragger.
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Old November 19th, 2008   #4
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Default Re: Instead of a passenger seat or tail-dragger aux tank...

Not that it couldn't be done, it's just 'time and money' right?

However, I think the tail dragger or pillion versions are very cost effective when compared to creating a 'new' or expanded tank.

If I ever did something like this I'd look into having a 'mock' tank with a 'bladder' built in. A lot easier to secure and build IMHO.

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Old November 19th, 2008   #5
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Default Re: Instead of a passenger seat or tail-dragger aux tank...

That's probabaly why no one has done one. I know when I first approached Ron Smith and Roy Fletcher about designing an aux fuel tank for the ST1300, they told me a tail-dragger would probably cost around $1500 to design and make. Whereas, Roy said he could make a Pillion seat mounted one for under $600.

I really wanted another tail-dragger but, I didn't have $1500 at the time and, it would have required a fuel pump. That seemed like one more mechanical thing that could go wrong. So, we settled on the seat mount.

But, I still miss that Tail-dragger on my ST1100.

Alan Barbic made a Tail-dragger for his ST1300 that he's selling with the bike. I want to make one too or something like it.

Roy's gung ho about the idea too. He just needs to recover enough and we'll be back at it. Clapping
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Old November 19th, 2008   #6
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Default Re: Instead of a passenger seat or tail-dragger aux tank...

One of the things to consider producing Joe is a 'flat pack' kit. Something people could have easily welded up by a local guy. Might be a way of reducing the cost for the consumer as well as the ROI for the person developing an solution. Of course a completed tank could also be offered if someone wanted one.

Just a thought.

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Old November 19th, 2008   #7
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Default Re: Instead of a passenger seat or tail-dragger aux tank...

Hmmm, I'll mention that to Roy.
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