Gas mileage too low?

Discussion in 'Rack Mounted Engines' started by Torques, Dec 3, 2006.

  1. Torques

    Torques Guest

    When I first got my Robins/Suburu motor new in mid August I was getting around 138 mpg. 2200 miles later I seem to getting around 114 mpg. I have a Robins/Subura eho53 friction drive system on my cruiser. I have run unleaded regular in it. Performance is good. I change oil around every 3-400 miles with Mobile 1. I have run some Seafoam thru it in case of some carbon buildup. Any ideas? Thanks.

  2. davidsis

    davidsis Guest

    Bad gas milage

    Maybe some adjustments on your carburator need to be made. Usually the vibration on engines will loosen up a screw on your carberator and make it burn more rich.
  3. Tom

    Tom Active Member

    There are a bunch of factors that could play a role in this problem.

    Tire pressure
    Riding conditions
    Riding style
    Engine wear?
    Drive pully wear?

    You should tune your bike up and then try checking your mileage again. Maybe you didn't use the exact same amounts of gas when you checked the first time vs the last time.
  4. mrsaxman99

    mrsaxman99 Guest

    how about replacing the spark plug?
  5. Torques

    Torques Guest

    The motor is only 4 months old with 2200 miles on it. Should a new spark plug be nccessary that soon?