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.

turns over doesn't start

Discussion in 'XJ Technical Chat' started by simon perrin, Nov 2, 2016.

  1. simon perrin

    simon perrin New Member

    Messages:
    14
    Likes Received:
    2
    Trophy Points:
    3
    Location:
    cornwall
    Xj550 ,diaphragms in carbs worn and perforated now replaced with new , engine will turn over but won't fire up mechanic reckons that no fuel is getting to spark plugs . He's using a clean fuel container piped up to the carbs rather than the tank that's on the bike . Bike started first time and idled well before it went to garage it didn't run well after 4000 revs probably due to the poor diaphragms . Thanks for any ideas
     
    simon perrin, Nov 2, 2016
    #1
  2. 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
    Start by bringing it home from the mechanic's.
    If all he did to the carbs was replace the diaphrams, he's not at all competent.
     
    k-moe, Nov 2, 2016
    #2
    TheCrazyGnat, Stumplifter and Jetfixer like this.
  3. Jetfixer

    Jetfixer Well-Known Member

    Messages:
    3,191
    Likes Received:
    1,501
    Trophy Points:
    113
    Location:
    Nothern Indiana
    Have carbs been fully cleaned and been bench synched...good chance the fuel enrichment passages are plugged( CHOKE) The best and only way I would do it is full tear down and soaking in carb cleaner.
     
    Jetfixer, Nov 2, 2016
    #3
    TheCrazyGnat and k-moe like this.
  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
    And replacing the throttle shaft seals.
     
    k-moe, Nov 2, 2016
    #4
    TheCrazyGnat and Jetfixer like this.
  5. simon perrin

    simon perrin New Member

    Messages:
    14
    Likes Received:
    2
    Trophy Points:
    3
    Location:
    cornwall
    Carbs now being tore down and cleaned and will be synched. Just wanted to know why no fuel getting through to spark plugs when there was before. The mechanic came highly recommended and has a good reputation he just wanted to see what it ran like before doing a full strip down
     
    simon perrin, Nov 3, 2016
    #5
  6. XJ550H

    XJ550H Well-Known Member Premium Member

    Messages:
    13,199
    Likes Received:
    3,861
    Trophy Points:
    113
    Location:
    Great North Woods
    could be he did not fully seat the diaphrams.
    what diaphrams did he use?
     
    XJ550H, Nov 3, 2016
    #6
  7. Toomanybikes

    Toomanybikes Well-Known Member

    Messages:
    2,836
    Likes Received:
    815
    Trophy Points:
    113
    Location:
    Tsawwassen bc
    Oem or jobber replacement ones have to be "indexed" correctly so that vacuum holes in the throttle slide are towards engine.
     

    Attached Files:

    Toomanybikes, Nov 3, 2016
    #7
    Stumplifter likes this.
  8. Stumplifter

    Stumplifter Well-Known Member

    Messages:
    2,792
    Likes Received:
    1,051
    Trophy Points:
    113
    Location:
    near Irma, WI
    Simon - we aren't hating on your mechanic (well maybe a little) but the collective experience here is that most mechanics are:
    1) younger than the XJ brought to them
    2) making a living turning over jobs

    So they do not have the experience/ knowledge of a synchronized 4 CV carb system AND their job is to get your bike in and out as quick as possible so they can move on to the next job. ,< This could be translated to mean that the mechanic says "That's close enough" and then hands you a bill.

    Do the work yourself (you can with help from this corner of the WWW) and rest easy knowing that everything was done right.
     
    Stumplifter, Nov 3, 2016
    #8
    TheCrazyGnat likes this.
  9. simon perrin

    simon perrin New Member

    Messages:
    14
    Likes Received:
    2
    Trophy Points:
    3
    Location:
    cornwall
    OK stum
    Mechanic is 55 years old has synched and cleaned many carbs .He also explained the process of fitting new diaphragms to me holes toward the engine and marking the position he also said I could do this myself but I don't know what I'm doing when it comes to synching the carbs I have tried to follow instructions but I get a bit lost i need to be shown person to person
     
    simon perrin, Nov 3, 2016
    #9

Share This Page