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cylinder #2 does not fire? Cold exhaust.

Discussion in 'XJ Technical Chat' started by Victor Hugo, May 14, 2020.

  1. Victor Hugo

    Victor Hugo New Member

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    Hi guys, I've been trying to find out why exhaust no. 2 is cold to the touch all others are plenty hot. I noticed it after I accidentally touched my exhaust pipe.

    While riding, the engine still runs smooth after it's warmed up.

    The spark plug is OK, I've switched the plug with #1 and #1 still gets hot.

    I think the carb is the problem, I let my bike idle w/choke and my exhaust no. 2 gets hot, but with no choke my exhaust no. 2 starts to get cold.

    Last week I had off the carbs of the bike, they all seemed fine and had no vacuum leaks. I cleaned them but I still have the problem.

    Any guesses?
     
    Victor Hugo, May 14, 2020
    #1
  2. Ben Hinz

    Ben Hinz Member

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    I had this issue when my float fuel levels were out of spec. The one cylinder that wouldn't fire when cold was a few millimetres too low. If those are all in spec, you may have some debris in the pilot jet/passage, any amount of gunk in there is going to cause issues.
     
    Ben Hinz, May 15, 2020
    #2
    Franz likes this.
  3. joejr2

    joejr2 Active Member Premium Member

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    Doesn't the pilot fuel system supply most of the fuel up to about 20 mph the the main system kicks in ?
     
    joejr2, May 16, 2020
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  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    yes up to 2k to 3 k rpm you run off of pilots.

    could be air jets are reversed mixture screw needs a little more adjusting sync off for that carb or pilot jet circuit is dirty/bad parts mixed up jets
     
    XJ550H, May 16, 2020
    #4
  5. joejr2

    joejr2 Active Member Premium Member

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    I had a similar problem a while back and it was a loose connection in the spark plug boot
     
    joejr2, May 16, 2020
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    XJ550H likes this.

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