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4 degrees advance disc

Discussion in 'XJ Modifications' started by Arnaud, Mar 19, 2025.

  1. Arnaud

    Arnaud Member

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    Someone sends me this plate. I am not yet familiar with these types of ignition.
    Do i have it correct i merely have to swap the outer disc?
    ttps://www.ebay.co.uk/itm/153470770511
    s-l1200.jpg
     
    Arnaud, Mar 19, 2025
    #1
  2. Dave in Ireland

    Dave in Ireland Well-Known Member

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    That plate is for a Diversion 900, don't know whether it's the same as the 900f or not.
    Problem with advancing the whole ignition four degrees, is that the full advance will be plus four degrees too, and that's probably not going to do much good.
    Get it wrong and holed pistons will be waiting.
     
    Dave in Ireland, Mar 19, 2025
    #2
    chacal likes this.
  3. Arnaud

    Arnaud Member

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    It is indeed the wro SUNP0033.JPG SUNP0035.JPG SUNP0036.JPG ng one, it does not fit.. Some have altered the holes in the back plate tot rotate it 4 degrees..
    IS there a plug and play rotor for a 1988 xj900f?
     
    Arnaud, Mar 21, 2025
    #3

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