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firing order.. help me !

Discussion in 'XJ Technical Chat' started by jace5150, May 10, 2011.

  1. jace5150

    jace5150 New Member

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    hello all,
    i have an 81 xj 750 seca. i dont have a manual yet but i was wondering the firing order. if your sitting on the bike. so is it # 1 plug wire on the left side of the bike or is it on the right thx
     
    jace5150, May 10, 2011
    #1
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    The #1 is on the left when seated on the bike. Firing "order" is NOT 1-2-3-4; however since each coil fires a pair of plugs (one cylinder receiving a "wasted" spark each time) the actual firing order isn't as critical as it is on a car, plug-wire wise.
     
    bigfitz52, May 10, 2011
    #2
    GunnersaurusRex likes this.
  3. Militant_Buddhist

    Militant_Buddhist Member

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    yep, numbered left to right viewed from the seat. Same is true when talking about carbs.
    it's ok to swap the 1 and 4 wires. Same is true of 2 & 3.
    there is a coil for the inner pair of cylinders and a coil for the outer pair.
     
    Militant_Buddhist, May 10, 2011
    #3
  4. KrS14

    KrS14 Active Member

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    I would think the firing order (power stroke) would be 1-2-4-3
    or some variation (2-4-3-1 etc)

    as 1&4 and 2&3 can't fire in succession.
     
    KrS14, May 10, 2011
    #4
  5. schmuckaholic

    schmuckaholic Well-Known Member

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    Right. I seem to remember there being a discussion on this before...
    Lessee here...

    http://www.xjbikes.com/Forums/viewtopic/t=18295/

    http://www.xjbikes.com/Forums/viewtopic/t=18148/

    http://www.xjbikes.com/Forums/viewtopic/t=13105/


    I'm thinking it's the same as on a four-cylinder car, or 1-3-4-2 (which alternates coils).
     
    schmuckaholic, May 10, 2011
    #5

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