1. 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.

unstable throttle

Discussion in 'XJ Technical Chat' started by Cudaguy, Jul 6, 2017.

  1. Cudaguy

    Cudaguy Member

    Messages:
    33
    Likes Received:
    5
    Trophy Points:
    8
    Location:
    Shelby Twp, MI
    Seems last week that I started getting some unstability in the throttle on my 82 xj1100j. Idle dropped so low that it would stall. Tried to adjust the throttle cable which helped...sort of. It fluctuates and either drops low or goes a bit higher, but does not stay steady for long. When turning the bars right, idle increases to over 3000 rpm; turn them left and idle drops to 500. Pull or tug on the throttle cable and rpms increase. The sheath appears tight at the carbs, but I have not yet lifted the tank to be certain. Anyone have ideas? Is this a bad throttle cable issue?
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    first adjusting the idle is done with the idle adjustment knob on front of carbs. it sounds like it was never adjusted properly or has backed itself out

    sounds as if your throttle cable may not be routed correctly or adjusted to tight . ie rpm changes when bars are turned left full or right full.

    of course pulling on the throttle cable is going to pull the internal cable and open carbs up and increase rpms.

    slack off the cable adjustment adjust idle with knob and lube the throttle cable while you are at it.


    edit for knob location
     
    Last edited: Jul 7, 2017
  3. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    ebknob.JPG Idle Knob


    edit for knob location corrected with pic
     
    Last edited: Jul 7, 2017
  4. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    your idle knob is in the front of the carbs as shown in this photo from ebay . it is the knob above the #1 in circle in the pic from FSM. fsm pic is a little off with its "RIGHT" and throat dipictions.
    knob.JPG ebknob.JPG red arrow points to knob
     
    Last edited: Jul 7, 2017
    Timbox likes this.
  5. dkavanagh

    dkavanagh Well-Known Member Premium Member

    Messages:
    1,301
    Likes Received:
    570
    Trophy Points:
    113
    Location:
    Rochester, NY
    FSM = Flying Spaghetti Monster, right?
     
    Wintersdark likes this.
  6. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    church of the Flying Spaghetti Monster. have you ever been to their web sight?

    beer volcano in heaven, stripper school , and we are all decendants of pirates

    Church of the Flying Spaghetti Monster

    FSM=Factory Service Manual
     
    Stumplifter likes this.
  7. Paul Howells

    Paul Howells Active Member

    Messages:
    362
    Likes Received:
    192
    Trophy Points:
    43
    Location:
    Victoria, BC
    No religion please. Motorcycle and motorcycle related topics only.

    Oops, there I go moderating again. Sorry.

    Ramen.
    ~••~
    }}{{
     
    k-moe, TheCrazyGnat and Stumplifter like this.
  8. dkavanagh

    dkavanagh Well-Known Member Premium Member

    Messages:
    1,301
    Likes Received:
    570
    Trophy Points:
    113
    Location:
    Rochester, NY
    come now, it's barely a religion! (ok, I'm done now)
     
  9. Ribo

    Ribo Prefectionist

    Messages:
    975
    Likes Received:
    260
    Trophy Points:
    63
    Location:
    Austin Texas USA ( a long way from the UK )
    What if motorcycle's ARE my religion!!!!
     
    TheCrazyGnat likes this.
  10. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,854
    Trophy Points:
    113
    Location:
    Great North Woods
    but I love pasta.
     
    TheCrazyGnat and Paul Howells like this.
  11. Ribo

    Ribo Prefectionist

    Messages:
    975
    Likes Received:
    260
    Trophy Points:
    63
    Location:
    Austin Texas USA ( a long way from the UK )
    This is why we have moderators - it's statements like this that can offend people and cause serious strain on the group, remember the penne is mightier than the sword.
    Pastafarianists welcome anyone to feel the warm embrace of his holy noodly appendage without judgement. Is not a fusilli religion.
     
  12. Stumplifter

    Stumplifter Well-Known Member

    Messages:
    2,792
    Likes Received:
    1,051
    Trophy Points:
    113
    Location:
    near Irma, WI
    brilliant! :p
     
    Ribo likes this.
  13. Cudaguy

    Cudaguy Member

    Messages:
    33
    Likes Received:
    5
    Trophy Points:
    8
    Location:
    Shelby Twp, MI
    Thanks for the help, that seems to have taken care of it by adjusting the throttle cable looser and using the knob at the carbs. I do think its time for carb rebuild as it seems they are leaking down after sitting and I had gas in the crankcase when I changed the oil last. I'm not very good with carbs.
     
  14. Stumplifter

    Stumplifter Well-Known Member

    Messages:
    2,792
    Likes Received:
    1,051
    Trophy Points:
    113
    Location:
    near Irma, WI
    Sure you are - you just haven't learned yet; go to Sunday School and get to Church!
    http://www.xjbikes.com/forums/threads/in-the-church-of-clean.14692/

    Order a Deluxe Rebuild Kit form XJ4Ever, take a deep breath, be organized, take digital pics and notes and ask questions here as you move through it. Don't be in a rush, take your time, cause you do it right and you may never have to do it again.

    Probably replace the engine intake boot gaskets also since you have the rack off.
     
    Plug likes this.
  15. k-moe

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

    Messages:
    19,613
    Likes Received:
    6,703
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    Motorcycle forum :)
     

Share This Page