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Old 01-17-2015, 04:11 PM   #1
Yellow Pig OP
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Question KTM 450/500 Extra Fuel?

??????????? Large fuel tank question ???????????


I'm setting up the bike for road book rallies like the Baja Rally and the NORRA Cortez Rally and am trying to figure out the best option for increased fuel capacity and have narrowed it down to two options. I already have a 3.4 gal tank I run regularly.

Option 1:

Large 5.3 gallon Acerbis w/ second fuel pump and all the mounting connecting hardware. This adds up to about +/- $600/650 ($290 Tank, $300 fuel pump, $70 for all the fasteners). This option gives me slightly more fuel capacity (5.3 vs 4.7), but puts all the bulk of the fuel in one spot making the front of the bike heavier.






Option 2:

Is the 5 Liter (1.3 Gal) rear tank. RMS sell this for $690.



This tank does not require a fuel pump, but taps into the front tank.




When I combine this rear tank w/ my 3.4 gal front tank I will have a total of 4.7 gallons and will have the weight of the fuel well distributed. Plus by adding an inline petcock i can choose if I want to use the fuel in the rear tank or not.




Has anyone use this rear tank?

Is the extra cost worth the distributed weight?

What is the wisdom of the forum?


Thanks
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Old 01-18-2015, 01:52 AM   #2
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Personal preference really. Take your choice as to whether you want potential failure points with the second tank - hoses, leaks, extra front connection etc vs better weight distribution of fuel.

The Alberto Dottori rear tank you picture is well made, though with any side mounted tank there is risk of bending brackets in a left sided fall.

You mention a second fuel pump on the acerbis tank? Not sure what you mean. You just take the standard pump from your standard tank and fit it into the new tank, there is no need for a second pump.

Another option is the rear safari saddle tank - if you look in the for sale section we have one up there which we can send to the US for not a huge shipping cost and overall is cheaper than both. You could run your standard front tank and bolt that on the back and you're good to go, capacity is 8.8 litres giving you a total of just over 16. (edited to add, the for sale rally thread seems to have vanished - $450 plus shipping. imimage is of an 08-11 bike, the tank is the same for the 12-15 bikes, fittings are slightly different, the one we have for sale is brand new in wrapping. the fixings are more robust and better designed on the 12-15). The price is around half of standard retail.

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Old 01-18-2015, 01:59 AM   #3
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Further - in part 3.6 of the baja rulebook your range required is only 100 miles. a 19 Litre tank like the one you picture is overkill. the 13L ktm powerparts tank would be enough, or the 15.5 litre acerbis rather than the 19L. Or keep your standard front tank and use a rear as above.
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Old 01-18-2015, 06:34 AM   #4
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Quote:
Originally Posted by Mike_MRS View Post
Further - in part 3.6 of the baja rulebook your range required is only 100 miles. a 19 Litre tank like the one you picture is overkill. the 13L ktm powerparts tank would be enough, or the 15.5 litre acerbis rather than the 19L. Or keep your standard front tank and use a rear as above.
i have the 5.3 and it just bolts on with your stock fuel pump, no fuss at all. As for range way over 100 miles, unless you pin it and leave it in first. Also I like the way it protect your rads from a fall. As in any rally it is nice to have the extra fuel just in case you take a wrong turn lol.
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Old 01-18-2015, 07:04 AM   #5
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I didn't mean you get 100 miles from it. I meant the MAXIMUM range REQUIRED for the Baja rally between fuel stops is 100 miles and as such, a 13 or 15.5 would be fine

I agree about having more, but a 19lire is overkill unless you already own one. I get 130 miles from my 11.5 litre tank for example unless WOT
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Old 01-18-2015, 08:41 AM   #6
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Keep in mind Pig is looking at the Cortez Rally as well, which requires a range of 140 miles (225km), unless he's willing to take a time hit for an "on-the-clock" gas stop, in which case the required range is 85 miles (137km). And those ranges include some Dakar style dunes, which uses more gas. See Details PDF for lots of info.

Then consider all Cortez Rally participants get an exclusive invite to join us for some Grand Rally fun too. And that has some pretty long sections, maybe somewhat over 150 miles between gas. That's also the target range for many of my past Death Valley Rally stages, which are popular for rally navigation training.
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Old 01-18-2015, 09:09 AM   #7
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Seems like you guys are doing some interesting things over there. Tim (BBM tim) was telling me about the Cortez, sounds really interesting
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Old 01-18-2015, 11:54 AM   #8
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That's the crux of the thing: 140 mile requirement +/-15% for long loose sand sections really makes it a 160 mile range and that's if you make no navigation mistakes. It's easy to add a few miles to that.
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Old 01-18-2015, 03:13 PM   #9
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>"makes it a 160 mile range and that's if you make no navigation mistakes. It's easy to add a few miles to that."

Yup. A couple 10 or 20 mile backtracks really hurt the extended range.
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Old 01-18-2015, 04:31 PM   #10
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Run this BIGGER TANK 4.1 gal
you can get it from
just gas tanks for $449.00
Colors Available: Translucent White, Orange and Black

Will use stock fuel pump.

Shrouds are incorporated into Tank.

and the 1.3 gal the rear side tank !!!!!
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Old 01-18-2015, 06:20 PM   #11
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OK now we are going overboard!
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Old 01-18-2015, 06:31 PM   #12
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Yellow Pig I sent you a pm
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Old Yesterday, 03:58 AM   #13
Hedonist222
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Gents, I'd like to add a 4.1 Acerbis.

My understanding from another these is that it's possible to use the stock shrouds.

Any photos?

Also, will the 4.1 require any modification to install?
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Old Yesterday, 04:02 AM   #14
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You can only use the stock shrouds with either the stock tank or with the 11.5 acerbis tank. The 4.1 you mention is the 15.5 Litre tank and it has its "own" shrouds/wings

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Old Yesterday, 06:43 AM   #15
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I know a lot of us, myself included, follow the form follows function school of thought but I have a 2015 6 days and would prefer to retain the overall look.

Id ideally like a 13 to 15 liter tank. The sweet spot being 13.5 liters.

But I wouldn't hesitate to loose the stock shrouds for a larger tank.



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