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Thread: CDI repair

  1. #11
    Senior Member Dell's Avatar
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    This is great! Where were you when I needed you? I have a spare since this is such a problem. A while back, there were attempts to address this on this forum, but never got much beyond the silicone that I recall.
    littletommy and jtomelliott49 like this.

  2. #12
    Senior Member tombauer's Avatar
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    if there were any serious threads about someone making a replacement. if you could please refer me to that thread that would be great, all i find are dead ends and people giving up. next time someone needs one let me know and i will make a prototype. i already have all the software and hardware they use.
    tom

  3. #13
    Senior Member WECSOG's Avatar
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    Just a question, no offense intended but do you have any references for actual TW CDIs you have repaired? Reason I ask is the only thing I find about you is Honda tractor CDI repair on tractor forums and ebay. There does seem to be some crossover between Honda tractor and Honda motorcycle CDIs, but those CDIs are much simpler than a TW CDI because their static timing is where it should be, while Yamaha set the static timing of the TW such that only a microprocessor controlled CDI will work.

    I'm not saying you don't possess the capability to rebuild a TW CDI. I'm merely asking for references if you do have experience with these specific CDIs.
    '87 TW200
    '94 Sportster 1200
    '74 XL70 Frankenbike
    '76 CT90
    '72 CT70
    '72 XL250

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  5. #14
    Senior Member Badgerflorida's Avatar
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    After all the CDI nightmares I've read about on here, I'm filing this under - good shit to know when it happens to me.

  6. #15
    Senior Member tombauer's Avatar
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    TW and BW CDI's do not use a microprocessor. They use a crude time delay with a quad op-amp at its heart. Honda mower CDI's use a dedicated time delay IC but much the same result. I have true microprocessor controlled CDI's for 1985 to 2000 BW and TW bikes. Need some people to test them on actual bikes and report the timing just for fine tuning of the curve.

  7. #16
    Senior Member Lyterx's Avatar
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    Quote Originally Posted by tombauer View Post
    T Need some people to test them on actual bikes and report the timing just for fine tuning of the curve.
    I have a 91 and will try one for you. My daily commute is 36-40 miles round trip mostly highway.
    1991 TW200

  8. #17
    Senior Member AGman's Avatar
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    XT200 is 35° @ 6000rpm while the AG200 is 29° at the same RPM if that helps. Don't have the specs for the TW200 but it would be somewhere around these values Id say considering they are the same top end. I may have the curves somewhere if I dig a bit deeper...

  9. #18
    Super Moderator Purple's Avatar
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    TW200


    advance tw200.JPG


    It might be worth trying to find the same information on the '87 TW, which were reputed, (according to our local donut dealer), to have the edge on acceleration, though they also had the tendency to wheelie easily if you goose it ....
    Last edited by littletommy; 08-24-2017 at 05:04 AM.
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 5000 miles on the clock - TW225 Special Edition 2007

  10. #19
    Super Moderator littletommy's Avatar
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    Quote Originally Posted by Purple View Post
    TW200


    advance tw200.JPG


    It might be worth trying to find the same information on the '87 TW, which were reputed, (according to our local donut dealer), to have the edge on acceleration, though they also had the tendency to wheelie easily if you goose it ....
    Indeed, so be extremely careful ...
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

  11. #20
    Senior Member TopPredator's Avatar
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    Welcome from Bel Air Maryland. Give me a shout if your in my area. We'll take a spin.
    littletommy and jtomelliott49 like this.
    If I’m ever on LIFE SUPPORT, UNPLUG ME. Then plug me back in... See if that works. Hidden Content

    TW 2006 Ruth
    TW 1988 Black Widow.
    1994 Harley FXR

    Rick

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