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Won't idle.

Discussion in 'XJ Technical Chat' started by Paradox1559, Apr 30, 2019.

  1. Paradox1559

    Paradox1559 Member

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    Ok, progress has been made. after taking It to church, It will now run without choke. But it revs up to 6k at startup and wont idle down passed 2500 rpm. The idle set screw is mostly for looks. I do have vacuume leaks according to the propane test. BUT it's a step in the right direction, I'm going to have to change my shaft seals and find boot fittings that aren't bottomed out and bent.
    For giggles I took it for a mile long stretch down the road, and it does not like the low end. But dam is it happy passed 4.5k. Then it also has trouble reving down, no doubt a symptom of vacuume leaks.
     
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  2. Jetfixer

    Jetfixer Well-Known Member

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    You need to a running synch , if one carb opens more than another this will cause what you describe, and if butterfly plates are not centered right is another symptom.
     
  3. Paradox1559

    Paradox1559 Member

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    Tomorrow I'm going to be looking at affordable vacuume gauges. I'm not too fond of the two bottle thing. I'm also curious about that clear spark plug whos name escapes me.
     
  4. k-moe

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

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    The clear sparkplug is a Gunson Colortune.

    Cheap gauges are just that. Invest a bit more for a MorganCarbtune, or a set of MotionPro stick guages. If you can find a used Morgan Carbtune set all the better; those don't ever need to be calibrated.

    @chacal sells all of that (except for the possability of getting one used).
     
    Last edited: May 2, 2019
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  5. Paradox1559

    Paradox1559 Member

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    Screenshot_2019-05-03-18-30-00.png
    Just ordered one of these. Can't believe it's taken me this long. I've got a suzuki gt750, Honda cb750, a katana, a goldwing, and a couple vws. I can only imagine the kind of difference I'm going to have after everything is tuned properly.
     
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  6. Jetfixer

    Jetfixer Well-Known Member

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    You will not believe how easy it is to use and tune, I have the 4 vacuum gauge manifold , finally ordered the Morgan tune , I was close with the vacuum gauges but now spot on .
     
  7. Paradox1559

    Paradox1559 Member

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    Well, this is the reading I got......

    My #4 has no vacuume, at least not enough for my guage to pick up... I moved the tubes around in different ways, but every time, the result was the same.

    I suppose that points to valves....

    20190506_202126.jpg
     
  8. XJ550H

    XJ550H Well-Known Member Premium Member

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    nipple could be plugged. shims out of spec.

    move hose to another cylinder see if it is the tool
     
  9. Polock

    Polock Well-Known Member

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    i think the only way to have no vacuum is to have no compression
     
  10. k-moe

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

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    Pretty much. Unless it's not.

    Compression test is order, in addition to the things XJ550H mentioned.

    Valves being out of spec would still draw vacuum, and if they were so far off that there was no vacuum then that would mean they aren't opening at all. That is unllikely to happen on just one cylinder.
     
  11. Paradox1559

    Paradox1559 Member

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    Bout had a heart attack, it was a plugged nipple.
     
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  12. k-moe

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

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    The easy things.....
     
  13. Paradox1559

    Paradox1559 Member

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    Does anyone have the exact measurements of the yics blicking tool? I would like to see if I can make them.

    Also, are the passages the same on every bike?
     
  14. Chitwood

    Chitwood Well-Known Member

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    I think somewhere here are the measurements to make one but it's not needed IMHO. I've sync'd mine with and without, cant tell a difference
     
  15. Paradox1559

    Paradox1559 Member

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    Well, I've cleaned my carbs with the intensity of a thousand suns. My throttle shaft seals are still soft, and look fairly new. I have the Carbs synched, and the pilot jets opened to 2 turns. But I can't get the dam thing to idle. It barley even responds to tuning but it will run with enrichment.. I've tried a lean mixture, and a rich mixture. Everything is where it should be, I've checked 4x. The only thing I can think of messing it up is the 4-1 exhaust that came on the bike.
     
  16. Polock

    Polock Well-Known Member

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    don't need exact measurements, don't need the tool at all really. all it takes is to isolate each port, and keep the ends sealed.
    the ports are in line with the carbs so somewhere between the carbs works
     
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  17. Polock

    Polock Well-Known Member

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    two turns isn't enough try 3
    turn the idle up till it will run and take it from there
    4/1 pipes isn't the problem as far as idle goes
     
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  18. Paradox1559

    Paradox1559 Member

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    3 turns... Dayum. I'll try it when I get off work. I think I read somewhere that you can jam a strip of ATF soaked tee-shirt in the port and block it off with that.
     
  19. Polock

    Polock Well-Known Member

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    ATF, what a mess. then are you sure their all blocked? 1 and 4 are close to the ends, is there a vacuum leak there?
     
  20. Paradox1559

    Paradox1559 Member

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    I work in a diesel shop so I have plenty of crush washers, I'm going to try changing them. But the boots aren't leaking.
     

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