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to the max... gonna need some pointers (thanks in adavance)

Discussion in 'XJ Technical Chat' started by to the max, May 26, 2018.

  1. k-moe

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

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    That's part of the enrichment circuit. The brass part inthe bowl is the enrichment jet. They are non-removeable, and tend to clog.

    What you need is a sermon.
    IN THE CHURCH OF CLEAN
    Replacing your Hitachi throttle shaft seals
    Setting the fuel levels
    Inside your Carbs
     
  2. to the max

    to the max Member

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    this needle came out of it's seat. can i fix this?
     

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  3. to the max

    to the max Member

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    this came apart
     
  4. k-moe

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

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    I've never run across that problem. It should be able to be repaired with a 2-part epoxy, but make sure that the overall length is the same as an undamaged needle and holder.
     
  5. XJ550H

    XJ550H Well-Known Member Premium Member

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    you cut a new slot in the jet with a dremel or hacksaw .. or try vise grips
     
  6. to the max

    to the max Member

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    this is how i fixed the diaphragm needle. had to squeeze the end down to get it back in the seat. chucked it up in this tool because it uses a collet. then hit the end with a sharp chisel to expand it.

    the kits i ordered for the bowl side rebuild came with an o-ring and an aluminum disc. (ordered off ebay from some place in korea or something) any ideas what the o-ring and disc are for?
     

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  7. Colin 85 700

    Colin 85 700 Active Member

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    That is a pickup for the choke circuit, there is a tiny jet in the bottom that must be clean, squirt carb cleaner in the hole top, should come out the bottom, if I does not, a lot of time fiddling with a single strand of a copper wire down there from that top hole sometimes cleans the jet, it's like .010" diameter, also try heating the tube with a torch and hit it with compressed air.... or find another float bowl.
    Hope this helps
     
  8. to the max

    to the max Member

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    got them all open. soaked them in the stuff in the picture, then shot carb cleaner through both ways. thanks for your info friend.
     

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  9. Colin 85 700

    Colin 85 700 Active Member

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    Mint! Glad I could help!
     
  10. to the max

    to the max Member

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    it ran today. wouldn't idle with the choke closed
     
  11. Colin 85 700

    Colin 85 700 Active Member

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    Then the idle jet is plugged, or the float level is way too low, gotta pull the carbs back off, uuuh
    Believe there's a thread heard about carb set up, browse around, if not I can give some pointers
     
  12. to the max

    to the max Member

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    firing order... 1-2-3-4? is this diagram right? if so, my #4 wire doesn't reach the plug.
     

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  13. to the max

    to the max Member

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    after a buddy noticed the wires on the wrong plugs, it idled but exhaust 2 & 4 are way colder, and throttle response was way too slow. plugs do spark outside the engine. i'll look for a thread on plug wires
     
  14. XJ550H

    XJ550H Well-Known Member Premium Member

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    coil pack fires 1 and 4 at same time the other coil pack fires 2 and 3. wasted spark ignition so 1 and 4 fire each time. you can swap wire from 1 to 4 and 4 to 1 .

    try swaping the #1 spark plug with # 2 to rule out spark plug. then 3 and 4 plug

    the spark plug caps have a resistor in them unscrew the cap trim end of spark plug wire re attach also ohm out cap see if it is in speck swap cap 1 with 4 see what happens then 2 with 3 .
    you can buy plug wire splices and put new longer wires onto coils.

    what you are doing above is seeing if problem moves with spark plug then with cap. If problem does not move it would be a carb issue most likely
     
  15. Rooster53

    Rooster53 Well-Known Member Premium Member

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    Firing order 1, 2, 4, 3 and the photo looks correct. Is this how they are currently connected?
     
  16. to the max

    to the max Member

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    and my 1&4 coil has t-134 boots with about 10k ohms on each. the 2&3 coil has t-133 boots with roughly 5k ohms on each.
     
    Last edited: Jul 14, 2018
  17. XJ550H

    XJ550H Well-Known Member Premium Member

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    XJ700 air-cooled models:

    Pick-up coils:
    120 ohms +/- 20% = 96 ohms to 144 ohms acceptable range


    Ignition Coils:

    Primary side (input from main wiring harness):
    2.7 ohms +/- 10% = 2.43 ohms - 2.97 ohms acceptable range

    Secondary side (spark plug wires, without their end caps):
    12K ohms +/- 20% = 9,600 ohms - 14,400 ohms acceptable range


    Spark plug caps:
    1985 N/NC models: 5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range
    1986 S/SC models: 10K +/- 20% = 8,000 to 12,000 ohms per cap acceptable range


    Spark plugs:
    1985 N/NC models: 0 ohms per plug
    1986 S/SC models: 5K ohms per plug
     
  18. to the max

    to the max Member

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    the service manual i have is for the "xj700 n/nc". sounds like i need the "s/sc" manual.
     
  19. to the max

    to the max Member

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  20. turpentyne

    turpentyne Active Member

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    Yep... same tools I splurged on. :) If I recall, the thinnest wire is the one I used in the enrichment components. Be careful about the bottom where the hole in the bowl changes direction. And, I don't believe those are completely smooth wires, they have a little 'texture' for cleaning -- you don't want to enlarge the hole. Just clean it out.

    After, go into a dark room, shine a good penlight in from the bottom hole and look down the top to see if light glows up from below.. and no microscopic boogers.
     
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