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Thread: Gas filling with petcock equipped R bikes.

  1. #1

    Gas filling with petcock equipped R bikes.

    Not knowing the internal design of the gas tank, the question is simply-when filling with gas does it make any difference whether the petcock is set to normal or reserve?
    Would you run for a short period with the setting on reserve to get rid of "stale gas', or does all gas flow through that part of the tank anyway? tia

  2. #2
    Registered User lkchris's Avatar
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    Not a bit.
    Kent Christensen
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    '12 R1200RT, '02 R1100S

  3. #3
    Grammarian no, Rider yes ISAMEMON's Avatar
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    it will all be mixed on the first bump

  4. #4
    Registered User stanley83's Avatar
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    Tank Design

    The Airhead tank has a cross section of an inverted "U" with a petcock at the bottom of each side. Each petcock has two input tubes, the long one for "normal" and the short one for "reserve". This allows crap to settle to the bottom of the tank and not be drawn into the fuel system. Hope this helps visualize things.
    Justin in Somerville, MA
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    Lots of bicycles

  5. #5
    Liaison 20774's Avatar
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    Plenty of petcocks shown on Duane's page to get a sense of the straws that stick up in the tank.

    http://w6rec.com/duane/bmw/petcock/index.htm
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  6. #6
    Registered User
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    and, as has been implied, it is one single large container.
    if you were on reserve, flip to "on" so that you have a reserve to work with after a few more hours of riding. otherwise, you might find yourself pushing the bike to the next gas station.
    Ride Safe, Ride Lots

  7. #7

    Petcock question

    Thanks. All is clear. Now just sitting around waiting for R100RT to be delivered to day.

  8. #8
    Registered User
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    Congratularions!

    One of the very best days is the one when you take delivery of a new ride. And, an Airhead???

    Excellent.

    Walking Eagle

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