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Thread: gas tank alignment issue

  1. #1
    apriliaforum Junkie
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    gas tank alignment issue

    today I did some work requiring removal of the gas tank and now as I am trying to reinstall the gas tank, the bolt holes are off by 1mm. The rear bolt for the tank is loose to allow the tank to slide back and I honestly can't figure out what is stopping the tank from lining up. Any thoughts or experience with this?

    -Chris
    Bikes:
    2004 Suzuki GSX-R 600
    2004 Suzuki GSX-R 750
    2007 Aprilia Tuono - Map2, Brown Connector Mod, AF1 Link Plates, Mivv cans, Woodcraft Frame Slider, Motovision Frame Sliders, RhinoMoto Bar Ends

  2. #2
    apriliaforum expert DanV990's Avatar
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    Ethanol
    1999 (sold as a 2000 model in USA) RSV Mille Tricolor with Ohlins radial forks, 4 pad Brembo radial calipers, 16mm radial Brembo brake master, Ohlins shock with remote hydraulic preload, KTM sprag, Gen2 blue anodized forged aluminum OZ radial wheels, dual link modified 2-1 collector, Akrapovic slipon, 57mm Gen1 air box, Gen2 57mm TBs, 60mm tall Gen2 Tuono velocity stacks, Gabro A2BF EPROM, Falco clipons, long stem RS125 mirrors, 17/42 sprockets, carbon fiber front fender, rear hugger, chain guard, heel guards...

  3. #3
    apriliaforum expert DanV990's Avatar
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    http://www.apriliaforum.com/forums/s...-Tank-Swelling
    http://www.apriliaforum.com/forums/s...-shrink-faster
    http://www.apriliaforum.com/forums/s...-tank-swelling
    http://apriliaperformance.myfastforu...t&topicid=6239
    And a few hundred more threads across the various Ducati, Aprilia, Moto Guzzi, KTM and other forums address this issue

    Ethanol in the gas attracts water from the air, the water in the fuel is then absorbed by the nylon tank causing the tank to deform and or swell. Once your tank was off your bike it was no longer being held to size by the bolts and it "sprung", growing in your case by 1mm, which is pretty mild.

    My buddy used a long crow bar to "shoe horn" the tank back on to his KTM Super Duke. Others on this forum have slotted or otherwise elongated the bolt holes at the back of the tank. If you want your tank to shrink back to its original size remove the fuel pump from the bottom so it has good air flow and put it in a hot dry place like an attic for a couple of months so the water can dry out of the nylon.
    Last edited by DanV990; 04-07-2012 at 11:02 PM.
    1999 (sold as a 2000 model in USA) RSV Mille Tricolor with Ohlins radial forks, 4 pad Brembo radial calipers, 16mm radial Brembo brake master, Ohlins shock with remote hydraulic preload, KTM sprag, Gen2 blue anodized forged aluminum OZ radial wheels, dual link modified 2-1 collector, Akrapovic slipon, 57mm Gen1 air box, Gen2 57mm TBs, 60mm tall Gen2 Tuono velocity stacks, Gabro A2BF EPROM, Falco clipons, long stem RS125 mirrors, 17/42 sprockets, carbon fiber front fender, rear hugger, chain guard, heel guards...

  4. #4
    apriliaforum Junkie
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    thank you sooo much!
    Bikes:
    2004 Suzuki GSX-R 600
    2004 Suzuki GSX-R 750
    2007 Aprilia Tuono - Map2, Brown Connector Mod, AF1 Link Plates, Mivv cans, Woodcraft Frame Slider, Motovision Frame Sliders, RhinoMoto Bar Ends

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