Ran out of gas today... which way is reserve?

Discussion in 'Motorbike Technical Discussion' started by Phil, Squid-in-Training, Nov 28, 2005.

  1. I'm a new rider on a '93 CBR600 F2. I've never filled a tank before, so
    here's my story.

    So I ran out of gas today about 0.5 miles from home. No biggie. Tank
    looked like it had gas in it... I guess it wasn't enough. Walked back home,
    pedaled the pushy over to the gas station to get a container and some gas,
    pedaled the pushy back to the moto, rode the moto back, rode another pushy
    back out to get the first pushy and gas can, and now all is well.

    Since my bike has different fairings from stock, I don't know whether
    reserve is up or down on the petcock. I tried switching it the other way
    and then trying to start the bike after it lost power, but it didn't make a
    difference. Maybe I was on reserve the whole time... The honda service
    manual is, as usual, completely useless. An owner's manual would be so much
    more useful since I'm a new rider.

    Anyone know how to tell whether reserve is switched up or down, or know off
    the top of their head?
    Phil, Squid-in-Training, Nov 28, 2005
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  2. Phil, Squid-in-Training

    sgoulart Guest

    Def the post of the week !!
    sgoulart, Nov 28, 2005
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  3. Phil, Squid-in-Training

    CK Guest

    Why would the fairing make any difference if the petcock itself is
    bolted to the bottom of the gas tank?
    The main supply is probably straight up and down and the reserve
    setting is probably sideways, pointing forwards.
    CK, Nov 29, 2005
  4. Phil, Squid-in-Training

    CK Guest

    Does that model have an electric fuel pump? I can't tell from looking
    at the fuel tank diagram on www.partsfish.com which model is gravity
    flow and which has an electric pump.

    A motorbike with an electric fuel pump may have the fuel pump relay
    controlled by the engine electronic control unit (ignitor box) and when
    the fuel pump runs out of gas, you may have to do a lot of cranking the
    starter to fill up the carbs. Every time you stop pushing the starter
    button, the fuel pump quits because it's not getting a "run" signal
    from the ECU. This confuses newbies that have added fuel to the gas
    tank, only to find the engine doesn't immediately start.

    (The engineers at Yamaha cleverly engineered a five second electronic
    timer to run the fuel pump and fill up the float bowls but other
    motorbikes lack that handy feature.)
    CK, Nov 29, 2005
  5. Phil, Squid-in-Training

    John Johnson Guest

    From looking at a couple of pictures (link below), it appears that the
    positions are "Off", "On", "Res", with "Off" located a 9 O'clock, "On"
    located at 6 O'clock, and "Res" located at 12 O'clock.

    links to large pictures:

    A google image search might turn up better pictures, but I'm not
    interested enough to spend more time on this. HTH


    'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
    John Johnson, Nov 29, 2005
  6. Hey man thanks... I didn't think of looking up pics like these. I'll give
    it a try.
    Phil, Squid-in-Training, Nov 29, 2005
  7. I'm guessing you know the answer to this one already, but it's because the
    directions are labeled on the fairing.
    Phil, Squid-in-Training, Nov 29, 2005
  8. Interesting. I don't know whether it has an electric fuel pump or not, but
    I do know that when I got gas and filled it up, I cranked it for about 5 or
    6 cranks and it popped right up. A few more cranks than usual, but nothing
    too long. Thanks for the input though, I'll check it out.
    Phil, Squid-in-Training, Nov 29, 2005
  9. Phil, Squid-in-Training

    John Johnson Guest

    Typically not. Most 3-position petcocks that I've seen (on/off/reserve,
    and on/prime/reserve are the variants that I've run into) have the
    off/prime position at a right angle to the on and reserve positions.
    This makes sense given the typical setup of the on and reserve settings.

    IME, the petcock itself is a solid disk of metal, with a hole bored
    through it _off-center_! There are then two holes in the tank fitting
    and some arrangement that leads into a single hose-barb at the other
    end. The reason for two holes in the tank fitting is because a "tower"
    sits inside the tank, and this tower has two separate sides (each
    corresponding to one of the fitting holes), and it has a hole/opening on
    each side. The "on" side has its hole higher up in the tank than the
    "reserve" side does. That's what the reserve is: the gas lower down in
    the tank.

    Back to the positions of the valve: on and reserve are parallel to each
    other because there's only one path through the disk. The difference is
    which side of the in-tank "tower" is supplying the fuel, and that
    difference is made by "switching" the side of the disk that the hole is
    on...accomplished by rotating the disk 180 degrees. The off position is
    simply a position where the body of the disk blocks the flow of fuel
    through the fitting.

    I hope this explanation made sense. Anyway, it's a pretty elegant
    solution to the design problem, IMO. Simple, robust, and quite
    effective. fwiw


    'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.
    John Johnson, Nov 29, 2005
  10. I hope this explanation made sense. Anyway, it's a pretty elegant
    Perfect sense. Thanks.

    Why do they call it a "prime" setting?
    Phil, Squid-in-Training, Nov 29, 2005
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