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CDI Compatibility - 86 XJ900

Discussion in 'XJ Technical Chat' started by discostu_001, Mar 12, 2013.

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  1. discostu_001

    discostu_001 New Member

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    Anyone know if the CDI unit of an xj750 is compatible with the xj900??

    The model number i have is CDI (TID 14-37 58L-10)

    Cheers, Stu
     
    discostu_001, Mar 12, 2013
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  2. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    None of our XJ's have a CDI, it's a TCI :p

    Not only me being pedantic, but will help you in searches etc to use the right term. The 750 one will likely allow your bike to run but the timing will be a way out & will lose you a ton of power & possibly cause overheating, so not a good idea I'm afraid.

    If you put your incorrect one up for swaps there's a chance somebody will have what you're looking for though
     
    750E-II_29Rbloke, Mar 12, 2013
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  3. adrian1

    adrian1 Active Member

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    adrian1, Mar 12, 2013
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  4. discostu_001

    discostu_001 New Member

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    Thanks; and yep after some more research I now know the difference between tci & cdi.

    I'll have to source another xj900 tci unit from a similar year.
     
    discostu_001, Mar 13, 2013
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  5. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    Hang on, tired so just noticed that you have a 58L TCI? That is a 900 TCI...

    What model bike do you have?
     
    750E-II_29Rbloke, Mar 13, 2013
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  6. discostu_001

    discostu_001 New Member

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    Yep I have an 86 xj 900, I've sent off my tci unit to get repaired. Hope to get it back this week!

    I was searching for alternatives as the tci units second hand are hard to get a hold of.
     
    discostu_001, Mar 16, 2013
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  7. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    Right I get ya :) Do you know what was wrong with it or what caused the failure?
     
    750E-II_29Rbloke, Mar 16, 2013
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  8. discostu_001

    discostu_001 New Member

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    So I sent off my TCI unit to an auto elect (Jack @ City Auto Electrics in Coburg, VIC) who diagnosed that one side wasn't firing.

    Not sure if it was a broken solder or if it just needed a cleanup. But $290 later, I have a working TCI unit with a warranty...

    Plugged it into my bike and it fired up like normal on all four.

    Thats an expensive win, but a win all the same :)
     
    discostu_001, Mar 19, 2013
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  9. 750E-II_29Rbloke

    750E-II_29Rbloke Active Member

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    Expensive yes, that's why I was wondering if you knew what caused the failure in case it happened again. Didn't they tell you what they did? I'd wanna know they'd removed, tested & polished n resoldered every part for that money :D

    Glad she's running good :)
     
    750E-II_29Rbloke, Mar 20, 2013
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  10. adrian1

    adrian1 Active Member

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    Did you not think second hand was an option on this one? or.....?
     
    adrian1, Mar 20, 2013
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  11. Rice_Burnarr

    Rice_Burnarr Member

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    Ya gotta do what ya gotta do, but yikes!

    Tell ya what... I'll take care of ya next time for the low, low, price of $250. :wink:
     
    Rice_Burnarr, Mar 21, 2013
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  12. baz666

    baz666 Member

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    tough one. i tried that but the 900 has it's own timing set up not related to 750s etc. Prof. John Oughton owns my old XJ900 and i think he had this issue. Look him up.
     
    baz666, Mar 23, 2013
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  13. darkfibre

    darkfibre Member

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    $290? Holy cow!

    Most TCI units just need the electrolytic capacitors replaced and a full resolder of every connection. On occasion you may need to replace a coil driver (transistor).

    Anyone got any dead units? It may be worth me repairing some and offering an exchange service, as I have repaired ECUs etc as a job for many years and can actually bench run these units.

    A previous play;
    TCI repair
     
    darkfibre, Mar 23, 2013
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  14. discostu_001

    discostu_001 New Member

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    I thought about buying one of the Hyperpack units from NZ but wasn't sure about it... http://bit.ly/106xD06

    I couldn't find a second hand one and didn't want to spend weeks looking.

    Anyway, carbs balanced & tune done, running perfectly with my pipes :) Pretty stoked > Pic attached

    [​IMG]
     
    discostu_001, Mar 24, 2013
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  15. quebecois59

    quebecois59 Well-Known Member

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    Very nice bike! What are these mufflers exactly?
     
    quebecois59, Mar 24, 2013
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  16. discostu_001

    discostu_001 New Member

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    They're a pair off a Triumph Thruxton. Thank you ebay.
     
    discostu_001, Mar 24, 2013
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  17. quebecois59

    quebecois59 Well-Known Member

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    Do these mufflers sound as good as they look?
     
    quebecois59, Mar 24, 2013
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  18. discostu_001

    discostu_001 New Member

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    Ah they could sound better; pretty quiet to be honest. However they do look great.
     
    discostu_001, Mar 25, 2013
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  19. discostu_001

    discostu_001 New Member

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    14 months later, same problem :( FML and the repaired TCI unit is out of warranty

    Cylinders 2 & 4 not firing...

    Started after riding home in the wet, there seems to be no water getting in under the seat though... what else might be causing my TCI unit to fail?
     
    discostu_001, Jun 5, 2014
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  20. k-moe

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

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    What's the output from your voltage regulator look like?
     
    k-moe, Jun 5, 2014
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