1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

poor gas mileage

Discussion in 'XJ Technical Chat' started by dowski68, Oct 10, 2017.

  1. dowski68

    dowski68 Well-Known Member

    Messages:
    645
    Likes Received:
    280
    Trophy Points:
    63
    Location:
    Medford, Oregon
    usually I get about 40-45 mpg however all of a sudden it has dropped down to 36 mpg. Kinda frustrating!
    I recently rebuilt the engine so I am at a loss as to what the problem could be.
    When I rebuilt the engine I got new plugs and everything was great until three days ago.
    Any ideas ?

    just looking for some direction to start
     
    dowski68, Oct 10, 2017
    #1
  2. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,861
    Trophy Points:
    113
    Location:
    Great North Woods
    start as if you just got the bike
    check air filter
    compression test, check valves, ohm out ignition system, check for spark on all four cylinders. check exhaust pipe temp to see if it is running cold on a cylinder
     
    XJ550H, Oct 10, 2017
    #2
  3. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,861
    Trophy Points:
    113
    Location:
    Great North Woods
    how long ago did you rebuild and did you go through a break in proceedure?
     
    XJ550H, Oct 10, 2017
    #3
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

    Messages:
    19,647
    Likes Received:
    6,755
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    How's the wind been lately?
    Has the winter-blend fuel showed up at the gas station?
     
    k-moe, Oct 10, 2017
    #4
    TheCrazyGnat likes this.
  5. dowski68

    dowski68 Well-Known Member

    Messages:
    645
    Likes Received:
    280
    Trophy Points:
    63
    Location:
    Medford, Oregon
    Rebuilt engine last winter 2017-
    Not sure about the winter blend
    all four exhaust pipes are hot equally
    just changed all four plugs and gapped them at 6mm
    new fuel filter
    washed K&N air filters (PODS)
    will check mileage on this tank and see what it is.
    also will check spark resistance and such
     
    dowski68, Oct 11, 2017
    #5
  6. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,861
    Trophy Points:
    113
    Location:
    Great North Woods
    6mm gap? a little wide you mean .6mm
     
    XJ550H, Oct 11, 2017
    #6
  7. dowski68

    dowski68 Well-Known Member

    Messages:
    645
    Likes Received:
    280
    Trophy Points:
    63
    Location:
    Medford, Oregon
    yes indeed sir
     
    dowski68, Oct 11, 2017
    #7

Share This Page