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Old 12-28-2013, 11:34 AM   #1
hasenwerk OP
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Thumb Hasenwerk Adventure Extender Auxiliary Fuel Tanks

After countless prototypes and input from multiple inmates, the BMW F650 GS / Dakar and G650 GS / Sertao fuel auxiliary fuel tanks are now finally available!

The capacity of this tank is more than 6L or 1.6US gallons, with a reliable fill volume of 6L / 1.6 gallons when mounted on the bike. This equates to more than 500km / 300 mile range depending on your riding style. Compatible with most luggage systems and the three mounting points ensures a vibration free installation.


Tucked out of the way of most luggage systems.


Easy access to the aircraft quality fuel filler cap


Looks great on the Sertao and the Dakar!

PLEASE NOTE: This aux tank requires an aftermarket single can exhaust system (Leo Vince, SuperTrapp, etc) as it occupies the same location and mounting points of the 2nd exhaust can. Needless to say you need to supply this exhaust system as it is not included with the purchase of this tank. These tanks fit only the single cylinder 650cc Rotax engined bikes, not the twin cylinder F650s

Dimensions:
Physical external size:
40cm (l) x 12cm (w) x 15cm (h)
2.6kg with all fasteners and fittings
Just over 6L useable volume

15.75 x 4.75 x 5.9 inches
5.7lbs with all fasteners and fittings
Just over 1.6 US gallons in useable volume

Clearance needed to install
from center of bolt next to tail light to side of tank: 5cm
from center of bolt next to tail light to bottom of tank: 11.5cm

Does not stick out beyond the side panel plastic

All mounting hardware is included. Installation will take about 30 minutes and it makes no permanent modifications to your bike.

Regular price at fastforward.ca is $395 Canadian plus postage to the USA and Canada. ADVRIDER.COM members get free shipping! Overseas shipping is available at a discounted rate - just ask!






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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks

hasenwerk screwed with this post 04-15-2014 at 07:58 AM
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Old 12-28-2013, 11:34 AM   #2
hasenwerk OP
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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 12-28-2013, 01:08 PM   #3
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Thumb

very well done!
thanks for putting the work in

maybe you should explain how the fuel gets into the main tank.
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Old 12-28-2013, 01:57 PM   #4
Kim_uk
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Well done they look great.

From the photos they look too deep to fit with the hepco becker pannier rack :(

Can you supply some dimensions so I can check?

Link to rack
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Old 12-28-2013, 02:17 PM   #5
hasenwerk OP
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Quote:
Originally Posted by swamp View Post
very well done!
thanks for putting the work in

maybe you should explain how the fuel gets into the main tank.
As fuel leaves the main tank it has to be replaced by air or else it will implode, the vent hose provides this air. With the aux tank installed, the main tank vent line is connected to the output of the aux tank and the fuel is automatically sucked out of the aux tank refilling the main tank. Next to the filler cap of the aux tank you can see the new vent.
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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 12-28-2013, 02:24 PM   #6
hasenwerk OP
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Quote:
Originally Posted by Kim_uk View Post
Well done they look great.

From the photos they look too deep to fit with the hepco becker pannier rack :(

Can you supply some dimensions so I can check?

Link to rack
The HB racks have unique design and perhaps the rear support might be in the way, but it wouldn't take much to build a new bracket to clear the tank.

Here is a photo that I took during the prototyping. From the center of the bolt the tank goes down 11.5cm as it clears my support by 5mm.


Hope this helps - let me know if you need more details.
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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 12-28-2013, 04:29 PM   #7
Kainic
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Looks very nice.

Can you take some additional shots from directly behind the bike?
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Old 01-06-2014, 06:38 PM   #8
hasenwerk OP
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Quote:
Originally Posted by Kainic View Post
Looks very nice.

Can you take some additional shots from directly behind the bike?
Here is a photo of a prototyping tank installed, taken a little low - you can clearly see the signal marker from behind. My bike isn't with the production tank is currently positioned very well to get a good rearward shot.

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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 02-01-2014, 01:08 PM   #9
hasenwerk OP
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Just updated the main post with better installation clearance requirements and dimensions. Updated the PayPal link to include the advrider.com discount.
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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 02-02-2014, 09:44 AM   #10
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Hmmm....
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Old 03-12-2014, 09:39 PM   #11
grayroamer
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Question Q's

Hi David,

Thank you for developing this great product.

Questions:
1) What's the fill up procedure?
2) Have you thought about option for lockable fuel door?

Thanks,
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Old 03-13-2014, 06:48 AM   #12
hasenwerk OP
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Quote:
Originally Posted by grayroamer View Post
Hi David,

Thank you for developing this great product.

Questions:
1) What's the fill up procedure?
2) Have you thought about option for lockable fuel door?

Thanks,
Hey Grayromer,
The fill up procedure is pretty simple and straight forward. If you need it, fill it up, and if you don't, don't fill it up! The bike always removes the fuel from the main tank first and if there is any fuel in the auxiliary tank it will automatically transfer it to the main tank as the fuel leaves the main tank.

I have thought about a lockable fuel filler cap, but the company that I get the fuel filler caps from doesn't make one. The cap that I use is a genuine aviation fuel filler cap, I chose it over other designs for several reasons - it doesn't leak, no threads to strip, large opening so that you can fill it from any angle, flush mount, robust, readily available replacement o-rings... the list goes on. One could install a lock in it by drilling a hole in the cap but then you would loose any sealing properties around the place where you put the lock in, so personally I wouldn't do it.
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2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 03-13-2014, 11:19 AM   #13
grayroamer
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Quote:
Originally Posted by hasenwerk View Post
Hey Grayromer,
The fill up procedure is pretty simple and straight forward. If you need it, fill it up, and if you don't, don't fill it up! The bike always removes the fuel from the main tank first and if there is any fuel in the auxiliary tank it will automatically transfer it to the main tank as the fuel leaves the main tank.

I have thought about a lockable fuel filler cap, but the company that I get the fuel filler caps from doesn't make one. The cap that I use is a genuine aviation fuel filler cap, I chose it over other designs for several reasons - it doesn't leak, no threads to strip, large opening so that you can fill it from any angle, flush mount, robust, readily available replacement o-rings... the list goes on. One could install a lock in it by drilling a hole in the cap but then you would loose any sealing properties around the place where you put the lock in, so personally I wouldn't do it.
Thanks for a quick reply.
By "fill up procedure" I meant something like this:
"fill the main tank first, then fill the aux tank"
or
"fill the aux tank first, then fill the main tank"
or
"doesn't matter which you fill up, both get filled"

Sorry if it seems a dumb question - just covering the bases.

I understand the dilemma with the cap - it works as it is.
I agree, yet option to have it locked seems important to me.
How about something really simple like this:


Of course this is an "idea" not the "design".
You would have to design it to make it work once installed on the bike and be convenient too.
For locking device either come up with something smart like locks on some panier systems... or worst case scenario, just use a little padlock.
This way, the cap stays original, yet there is an option for locking.

Thanks...
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Old 03-13-2014, 01:10 PM   #14
hasenwerk OP
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Quote:
Originally Posted by grayroamer View Post
Thanks for a quick reply.
By "fill up procedure" I meant something like this:
"fill the main tank first, then fill the aux tank"
or
"fill the aux tank first, then fill the main tank"
or
"doesn't matter which you fill up, both get filled"

Sorry if it seems a dumb question - just covering the bases.

I understand the dilemma with the cap - it works as it is.
I agree, yet option to have it locked seems important to me.
How about something really simple like this:


Of course this is an "idea" not the "design".
You would have to design it to make it work once installed on the bike and be convenient too.
For locking device either come up with something smart like locks on some panier systems... or worst case scenario, just use a little padlock.
This way, the cap stays original, yet there is an option for locking.

Thanks...
Filling and using the tank(s).
I see your point here, thanks for asking for clarification...

For riding, best practice would be to have some fuel always in your main tank as some has to leave the main tank in order to create a small vacuum to start evacuating the aux tank via the vent line. If the main tank was totally dry you couldn't start the bike to create that initial pressure difference to start the fuel transfer. Think of it as an "adventure extender" so need to complete the first part of your adventure first!

Remember as the fuel leaves the main tank it is automatically replaced on a 1:1 ratio from the rear tank until it is empty. For example, we will assume 4L/100 fuel economy to make things simple: If you filled both tanks and rode 100km checked the level of the tanks you will see that the aux tank would be down 4L and the main tank would be as full (and no more full) as it was when you filled it last. If you rode 200km and consumed 8L of fuel, the aux tank would be empty and the main tank would be down 2L as the 6L aux tank emptied it's 6L of fuel into the main tank first.

Cap locking
I think you have a good concept for securing the cap, but real world use in my opinion would be less than optimal. The draw back for this would be removing that bar - it would have to slide out (hinges won't work as you will need to make holes) via the right side of the tank and not the left side of the tank as the tail light assembly will be in the way. If it is on the right side you will have problems if you carry luggage as that would probably be in the way too. Best way would be to insert it from the back and getting your hand in there to somehow get a lock on. Also, as everything is aluminium, if someone wanted access to the tank they could simply grab the lock and give it a good twist and the aluminium would quickly break releasing the lock. Same security weakness exists on panniers with external pad locks - the best way is an internal lock like the OE filler cap and upped end panniers, but that simply isn't practical in this application. I find that people don't screw with bikes all that much as they have the image of the drug dealer biker kicking their ass if they do and if they are going to take the time to mess with your tank then there's lots less they will mess up too. If you want $10 of fuel... well so be it and take it and don't damage anything is my view on this.
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David Marshall - Quesnel, BC, Canada - fastforward.ca
2006 BMW F650 "YZ" Dakar | 2013 BMW G650 "YZ" Sertao

ADVRIDER Discount: BMW F650 GS & Dakar / G650 GS & Sertao "Adventure Extender" 6L / 1.6gal Auxiliary Fuel Tanks
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Old 03-13-2014, 07:16 PM   #15
grayroamer
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Thank you for the explenation on filling up.
Makes sanse and I like the way it works.

Cap locking...
It's not really about someone stealing the gas...
It's about no one putting anything in... Sand, sugar, water, etc...
Anyway I think I can figure out a way to secure it on my own if necessary.
It's "alll good".
;)

Thanks for the info. I will contact you when I'm ready.
Panniers and exhust take priority... ;)
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