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250 miles on new rings and two new valves number 4 missing

Discussion in 'XJ Technical Chat' started by jamings67, Jun 14, 2015.

  1. jamings67

    jamings67 Member

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    Hi I have a 82 XJ1100 and the number 4 cyl is not working 100% . I can pull the plug at idle with no change in rpm or sound. If I hold it at 3k with the wire off it will start to pop from extra fuel in the exhaust and as soon as I put it back on it stops popping. So it seems to work at higher RPM and has good power after it gets above 2500 rpm.
    I know that the low jet controls this but I cleaned all the carbs when I got it running and it did change the idle speed when adjusting the needle. Anyone think it could be something other then low speed carb issues ? I also have done a full shim swap and have some valve tick on that side. What else can cause a miss at idle?
     
    jamings67, Jun 14, 2015
    #1
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    you should not be pulling the wire off with the engine running it can ruin your cdi/tci box.
     
    XJ550H, Jun 14, 2015
    #2
  3. k-moe

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

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    Unscrew the plug wire cap and cut back the wire by 1/4". see if that changes anything.

    Valve tick is a good thing.
     
    k-moe, Jun 14, 2015
    #3
  4. k-moe

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

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    As long as one of the plug wires on the coil has a path to ground there won't be any problems.
     
    k-moe, Jun 14, 2015
    #4
    jamings67 likes this.
  5. jayrodoh

    jayrodoh YimYam

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    I was gonna say carb issue. Do you have a colortune plug? Swap that in and see if it's firing at idle, then check your sync. I had a similar issue with my 750 and was carb sync problem (butterfly valve was closing before the others).
     
    Last edited: Jun 15, 2015
    jayrodoh, Jun 15, 2015
    #5
  6. Polock

    Polock Well-Known Member

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    swap #4 and #3 plug, see if the problem follows
     
    Polock, Jun 15, 2015
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  7. jamings67

    jamings67 Member

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    I fixed it. I cut the wire and recapped it. That was not the problem, I then turned the needle out 3 turns and ran the bike.
    I played with it for a few min turning it in a and out. Got a noted change in idle. set it at highest idle and then checked it by pulling plug wire. WORKING NOW. Must have been some shit stuck in the needle. Well it works now so all is good except it's raining and I can't ride it now.
     
    jamings67, Jun 15, 2015
    #7
    k-moe likes this.
  8. jayrodoh

    jayrodoh YimYam

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    Awesome. I won't edit my previous post but it was the low circuit still had an obstruction in the cicuit, not the butterfly closing. Total brain cart there.
     
    jayrodoh, Jun 15, 2015
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  9. k-moe

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

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    Riders ride. Rain is no excuse :) Thunderstorms and tornadoes are a perfectly fine excuse however.
     
    k-moe, Jun 15, 2015
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  10. jamings67

    jamings67 Member

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    YEAH but I have a bald tire and no full face helmet. I have tires on the way and need to get another full helmet. Mine is shot,was in a shed for two years and molded on the inside.
     
    jamings67, Jun 16, 2015
    #10
  11. k-moe

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

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    Well that's different then.
     
    k-moe, Jun 16, 2015
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  12. Toomanybikes

    Toomanybikes Well-Known Member

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    And an xj1100 will spool up the rear tire in the rain bald or not. And worse if your on a greasy road right after the rain starts
     
    Toomanybikes, Jun 16, 2015
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  13. Toomanybikes

    Toomanybikes Well-Known Member

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    Didn't own 4 wheels until 2 months before first son born. And it was a 1962 Valiant from mom !!! and robins egg blue to boot
     
    Toomanybikes, Jun 16, 2015
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  14. jamings67

    jamings67 Member

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    Do you own a xj1100?
     
    jamings67, Jun 16, 2015
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  15. Toomanybikes

    Toomanybikes Well-Known Member

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    Had a new xs1100e in 1978 bags and fairing , was a boat in town but on the hwy magic ,had long hair then and it wasn't grey Ps still have lots of hair!
     
    Last edited: Jun 16, 2015
    Toomanybikes, Jun 16, 2015
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  16. jamings67

    jamings67 Member

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    COOL I had long hair once, Most of its gone now but I sport a gray goatee. LOL
     
    jamings67, Jun 16, 2015
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  17. k-moe

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

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    To be fair, a Honda Cub will spool up the rear tire in the rain if you want it to.

    [​IMG]
     
    k-moe, Jun 16, 2015
    #17

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