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Old 06-12-2012, 10:46 AM   #21
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I read about this on adv a while back, but haven't had any problems on my 5 year old bmw. the tank fits under the seat so it would definitely be less noticeable but I do disassemble it frequently and never had fitment issues. I hope it's not something I will ever have to worry about.
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Old 06-12-2012, 01:09 PM   #22
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Never noticed it on my Speed Triple. But the longest it sat was maybe a month.
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Old 06-12-2012, 04:06 PM   #23
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Quote:
Originally Posted by Jesse H View Post
Never noticed it on my Speed Triple. But the longest it sat was maybe a month.
Same here. My former Speed Triple (2001) never had an issue with the plastic tank. I put a little over 32,000 in 5 years. Not sure about the longest it sat. If weather was bad for more than a week I will turn it on for 10-15 minutes every other day to keep the battery charged and the fuel moving.
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Old 06-12-2012, 06:10 PM   #24
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Quote:
Originally Posted by RACER X View Post
how often do you ride? mileage?
It sat for a little bit, not my everyday bike. It's got 1900 miles / 7 months old, sat for the last month or so in the garage.

I thought the gas would vent though instead of expand the tank though. I wonder now if leaving the gas cap off and covering it with a rag would be better for it when I let it sit for a while.
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Old 06-12-2012, 06:26 PM   #25
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It's a chemical reaction that is making the plastic expand, not internal pressure.
Basically the fuel is attacking the tank.
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Old 06-12-2012, 06:27 PM   #26
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It's a chemical reaction that is making the plastic expand, not internal pressure.
Is ethanol a contributing factor?
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Old 06-12-2012, 07:10 PM   #27
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Is ethanol a contributing factor?
Honestly I'm not sure. I have a feeling it is caused more by the nasty additives they put in the gas to minimize other problems caused by the ethanol.
On the Ducati forums there are reports from people who live in countries where they don't have ethanol and they are saying they don't have tank expansion issues.
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Old 06-12-2012, 07:21 PM   #28
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Quote:
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Is ethanol a contributing factor?
Ethanol inside of fuel attracts water, water gets into the nylon based plastic tank, causing the material to expand, ripple, or deform. The Ducati tanks are manufactured with a 6-6 composition based nylon that is affected even more than other nylon based products.
(Short version)

Acerbis was the maker of the mid 2000's tanks.
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Old 06-12-2012, 08:24 PM   #29
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If you have a bike with a plastic tank, have you experienced any tank deformation?

My SDR tank swells, to the point that it will not bolt on easily, and when it is bolted the tank rubs the steering head.

I know on the SDR forums, its a "common" problem, but KTM is iffy on replacing the tanks on bikes out of warranty, and most say its up to the dealer.

I also know Ducati settled a class action lawsuit concerning tank deformation.

Anyone else?

Anyone here work at a KTM dealer?
All of them have an issue due to ethanol.
Even the HD XR tank swells so much the cover won't fit properly.
There is no solution from the mfr's., until ethanol is removed from the fuel supply there will be an issue.
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Old 06-13-2012, 04:56 AM   #30
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Contacted Wild West and spoke with Dan, who was very nice. I sent him the requested information about my bike and problem and he contacted me back a few hrs later and told me KTM said its not a warranty issue.

So I have a bike that I cant steer because the tank rubs the steering head....awesome looking paper weight though.....
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Old 06-13-2012, 06:09 AM   #31
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Do some research. I can't believe they would leave it like that.
If it interferes with steering then it becomes a safety issue and the NHTSA should be on their .

Especially with the precedent being set by Ducati trying the same and getting their sued... and losing.
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