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Spark plug spark comes and goes... ?????

Discussion in 'XJ Technical Chat' started by thunder1295, May 2, 2010.

  1. thunder1295

    thunder1295 New Member

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    Hello again.. well now I have 2 1984 XJ750 Seca's I must be nuts..lol .. my problem is its getting a good spark on all cylinders bike runs great then the next time I start it it looses the spark on the 2 right cylinders, mess with the spark plug wires by taking them off and on and then I get the spark coming again and the cylinder firing again.. put in new plugs BP7ES, I know this isn't much info.. but maybe this has happened before..
    Thxs in advance..

    Jim
     
    thunder1295, May 2, 2010
    #1
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    The first thing to check is the caps and the ends of the wires. The caps actually screw onto the ends of the wires, there is a threaded spike inside the cap that screws into the core of the wire.

    Unscrew the offending caps from their wires, carefully lop off about 1/4" of the end of the wires, and screw the caps back on (don't overtighten and strip out the ends of the wires.)

    Since one coil fires #1 and #4 and the other fires #2 and #3 you can eliminate the coils if it's doing it on #3 and #4.
     
    bigfitz52, May 2, 2010
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  3. thunder1295

    thunder1295 New Member

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    Thxs Bigfitz52, going to try that.. and let you know...

    Jim
     
    thunder1295, May 2, 2010
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  4. thunder1295

    thunder1295 New Member

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    That fixed the problem.. did it to all 4 plug caps.. running like an old rolex..lol
    Thxs again...

    Jim.
     
    thunder1295, May 5, 2010
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