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Different color plugs and pipes

Discussion in 'XJ Technical Chat' started by xj750midnight, Jul 21, 2016.

  1. xj750midnight

    xj750midnight Member

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    Hi guys!
    I have checked the search option first, but I couldn't really find an answer!

    I have a XJ750MK '83 and I run with Pods and a 4-1 exhaust from a '84 XJ750F...
    Thanks to this forum and my colortune I've managed to make it runs good!

    First checked/adjusted valve clearance
    Got carbs who went to church!
    No vacuümleaks (anymore)
    Colortuned
    Carbtune pro tuned

    But now.........:
    I took my exhaust off for repainting...
    Cilinder 1 pipe: Grey
    Cilinder 2 pipe: Black
    Cilinder 3 pipe: white
    Cilinder 4 pipe: black

    So I have 2 Rich cilinders and 1 very Lean cilinder and 1 pretty good cilinder??

    Can I make the Lean cilinder more Rich by adjusting the throttle needle? And vice versa? I normaly drive "chill" (throttle 1/2???) I have a needle which I can't adjust with a clip, so I need to use washers to raise the needle...?

    The main jets are 120 and seem to be fine because of the two Rich cilinders... Is it normal to use different size of jets in each cilinder??

    Thanks in advance!

    René
     
    Last edited: Jul 21, 2016
    xj750midnight, Jul 21, 2016
    #1
  2. xj750midnight

    xj750midnight Member

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    The picture with the most white pipe is cilinder 3 and 4 the other one is 1 and 2
     

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    xj750midnight, Jul 21, 2016
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  3. Jetfixer

    Jetfixer Well-Known Member

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    What do your plugs look like? black,white grey brown? It is possible your synch is off, and what are your mixture screws set at? You state you are running pods and 120 main.... This is the stock size with stock airbox ... most people have to go up a couple of sizes to get bike running better ( I'm no fan of pods either) 124 is usual next step up. Sure there will be more opinions on this, just my 2 cents on this.
     
    Jetfixer, Jul 21, 2016
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  4. k-moe

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

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    +1 the color inside of the pipe does not necessarily indicate what's happening in the combustion chamber. Plug color is the telltale for that.
    As for the color in the pipes, I'd say that two of your exhaust gaskets may have been leaky.
     
    Last edited: Jul 21, 2016
    k-moe, Jul 21, 2016
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    xj750midnight and Jetfixer like this.
  5. tabaka45

    tabaka45 Well-Known Member

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    trust your colortune plug.
     
    tabaka45, Jul 21, 2016
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    k-moe and xj750midnight like this.
  6. xj750midnight

    xj750midnight Member

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    score for K-moe! Exhaust gaskets where leaking! But.... Cilinder 1 plug is greyish (not coffee Brown... 2 is black, 3 is white and 4 is black...

    My mixture screws are probably about 6 turns from soft seat. Because of the pods... But I live in Amsterdam, Holland where we are below sealevel... So 120 is Maybe stock in USA but Maybe not in the Netherlands?

    When I use my colortune, I tune my combustion at Idle right? (Mixturescrews) but how do I adjust the middle range while colortuning?

    I Ride 25 mins of highway 2 times every day... If 120 main is too small, cilinder 2 and 4 can't run Rich in my opinion...
     
    xj750midnight, Jul 22, 2016
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  7. k-moe

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

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    120 is stock whe whole world over.
    The idle mixtrue screws jus fine-tune the mixture. For mor radical changes (such as are needed with pods) you must change jet sizes and possibly shim the jet needles.
    A small jet will not cause a more rich condition, but a more lean condition, and since your pods are already making the biek run lean you had better do one of two things before you hole a piston.

    1. Bump up the pilot and main jets a size or two, and then fart around for a few weeks getting the jetting and jet needle position correct.

    2. Put the factory airbox back on and ride.


    Fuel mixture above idle is entirely controlled by the slides via engine vacuum.
     
    k-moe, Jul 22, 2016
    #7
  8. tabaka45

    tabaka45 Well-Known Member

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    For the life of me I can't understand why anyone would think the "pod look" is worth all the carb problems they cause. Just stay stock and like k-moe says, "enjoy the ride.":
     
    tabaka45, Jul 22, 2016
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  9. xj750midnight

    xj750midnight Member

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    I bought this Bike with pods, it was running awefull and I managed to make it run ok... I know that stock is the best you can get, but... Don't want to give up yet! :)
    I like to work on my bike, so it worth it for me!
     
    xj750midnight, Jul 23, 2016
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  10. rocs82650

    rocs82650 Well-Known Member

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    Are the pods stacked (cut off air boots attached to pods) to compensate for the extreme and erractic air flow delivered by the pods? Have you read the information in The Overload Hour regarding pods and how to establish a baseline if you insist on using them that includes a aftermarket exhaust system?

    Gary H.
     
    rocs82650, Jul 23, 2016
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  11. xj750midnight

    xj750midnight Member

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    Yes I have read the information in the overload hour, and don't know what you mean with stacked pods... I show you a picture of the filters which are on.
    image.jpeg image.jpeg
     
    xj750midnight, Aug 2, 2016
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  12. k-moe

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

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    He means attaching the filter to the airbox boot instead of irectly to the carb. The airbox boots are also velocity stacks; not just simple rubber tubes.
     
    k-moe, Aug 2, 2016
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  13. xj750midnight

    xj750midnight Member

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    Ah! Now I understand! They're directly fitted on the carbs in my case...
     
    xj750midnight, Aug 3, 2016
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