is this normal?

Discussion in 'Engine, Fuel and Exhaust' started by Adamal47, May 24, 2010.

  1. Adamal47

    Adamal47 Active Member

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    I have a 97 heritage softail with a s&s carb, Andrews cam, upgraded ignition, and 2 into 1 exhaust. I bought the bike this way so I'm just curious if its normal for me to get just over 125 miles per tank. This seems awfully low or should I expect this with these sort of mods?
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  2. Hoople

    Hoople Account Removed

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    What is your MPG. Because if you have a 2 gallon tank that is Great mileage and if you have a 6 gallon tank...well you know..:p:p
     
  3. Adamal47

    Adamal47 Active Member

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    Its a stock tank. I think it is roughly 5 gallons.
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  4. glider

    glider Veteran Member

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    If you record the number of miles traveled and record the gallons you fill up with at the next fillup, you can figure your MPG from there.

    Throttle use over the norm will lower the MPG.
     
  5. Hoople

    Hoople Account Removed

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    Well I doubt your running on vapors when you fill up so your looking at maybe 23 miles per gallon which is poor even for city driving. Yes, your bike is thirsty.

    The key items to look at for miles per gallons numbers is 1) cruise A/F ratios and 2) amount of spark timing at cruise RPM under light load map pressures.
     
  6. ultrat

    ultrat Senior Member Contributor

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    Around here we call them super soakers.... No thats low for s&s... mpg
     
  7. Adamal47

    Adamal47 Active Member

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    I would be happy to run in vapors rather than run out of gas like I did on the way to work today.
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  8. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    I have a 94 FLSTC with about the same mods, EV27 Andrews cam, Dyna 2000 ignition, Python 2 into 2 exhaust, and get 42 to 44 MPG if I stay out of the throttle. Drops to 39 to 41 if I'm running hard with friends. I've got a stock 4.2 gal tank and I'm looking for a gas station at about 140 miles.:D
     
  9. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

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    Be sure to check the tank vent check valve. If it aint working properly, you could be force feeding fuel through the system. Ask me how I know...........

    Bodeen
     
  10. Hoople

    Hoople Account Removed

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    Adam, just curious. What RPM does your engine tach at when in high gear (think your a 5 speed?) and doing 60 miles per hour.