The Yamaha TW200 Thread...

Discussion in 'Thumpers' started by neepuk, Jan 10, 2009.

  1. Keithert

    Keithert Been here awhile

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    974
    I asked about this when I looked at a TW. I was told a new cdi was about $350. I'd pick up a spare before I'd convert.
  2. JagLite

    JagLite Long timer

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    I would point you in the tow strap direction. :rofl
    Seriously.
    There are many things that can stop an engine and it would be impossible to prevent them all.
    If you really want to replace the CDI of course you can.
    Or, you could sell that bike and get a newer one.
    Or, you could just carry a 15' piece of 1" Dacron webbing or rope.
    A tow rope can come in very handy in many situations.
    Replacing the CDI system on a good running bike may be just throwing money away.

    As for searching, use Google.
    This is what I got immediately:
    https://www.google.com/search?q=cdi...09,d.cGE&fp=fbc654ff5548d064&biw=1366&bih=624
  3. g-haad

    g-haad Adventurer

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    Hi, I hear tell that my '84 xt200 shares a carb with the early model tw200's, along with many more parts I'm sure. I am having a hellish time keeping her running right now, originally would only idle and bogged as soon as throttle was applied. Thought I resolved that by setting the float higher, revved up fine, swung a left out the drive and.... dead

    Now I keep messing with the float level, it is about 1/8 " below the float bowl gasket level now but still no go. Are these carbs sensitive to float level? Anyone out there with some troubleshooting knowhow to help me out?

    :ear
  4. Small's

    Small's Been here awhile

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    I would put the float level at factory spec. Pull out the brass cap over the idle/air mixture screw "on the bottom of the carb towards the front side" and back it out 2.5-ish turns and maybe take out and clean the idle jet and the main jet. Both of my tw's would hardly run until they were warmed up.
  5. Dyno

    Dyno Conquistador

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    Yep, Like Small's said. Clean the air bleeds and jets. These carbs seem to corrode easily.
  6. Vincenthdfan

    Vincenthdfan Been here awhile

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    Is it an 87?

    Symptoms you're describing are failed CDI symptoms...everyone defaults to the carb when indeed its a no spark condition that can be somewhat intermittent.
  7. g-haad

    g-haad Adventurer

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    I've cleaned her up well, still the same. Any advice on how to isolate the CDI (I'm assuming that means the little silver regulator on the frame body) I have been blaming the carb for a while but I've just noted that the spark seems weak on some kicks and stronger on others.

    That aside, the plug still seems dry so I want to ensure the float is not my problem. Here is a pic of the level at present.

    Thanks for the help fellows.
  8. Falcon86

    Falcon86 I just work here.

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    Anyone have a set of plastics sitting around they'd like to sell?

    I've got an '01 TW that's all black, would like to bring it back to stock looking.
  9. Spud Rider

    Spud Rider Long timer

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    Firstly, make sure the problem resides with a poor, or absent spark. If you don't already own one, I suggest you purchase a digital multimeter. The TW200 Service Manual specifies the correct resistance values for the spark plug cap, ignition coil, stator, and pickup coil. If all the resistance values are good, and you still don't have a good spark, the culprit is probably the CDI unit.

    Spud :beer
  10. g-haad

    g-haad Adventurer

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    OK, done messing with the fuel side. Moving on to CDI side as was suggested. Measured primary (1.5 ohms) and secondary is 11.6K ohms! Seems too high. Anyone know what the value should be? My older Yamaha manual says on the order of 5K ohms.

    It seems to die out and/or not start now once it gets warm. all measurements were taken cold.

    :ear
  11. g-haad

    g-haad Adventurer

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    OK, may have answered my own question. Lead is about 5.8k ohm and coil is about 5.4k ohm. So it might point to possible CDI probs for weak spark. Is this thing possible to diagnose? Can you get into it? worthwhile?

    cleaned up all connections. still seems like a heat related thing.

    :ear
  12. g-haad

    g-haad Adventurer

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    Anybody out there with a manual for this old gal? I'm diagnosing the electrical side now. Would really appreciate a wiring schematic and a resistance value for the pulse coil if one is out there.

    :D
  13. frog13

    frog13 Long timer

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    g-haad......try the TW200discussion forum......it's all TW200 material,knowledgeable folks there!.
  14. g-haad

    g-haad Adventurer

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    Will do, much appreciated.
  15. Dr. John

    Dr. John Adventurer

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    Looking at an 07 with a Revlok clutch setup,anyone with any experience/opinion? Easily removed,lifespan function? Any help would be appreciated.
    Thanks, John
  16. Bikerjosh

    Bikerjosh I was punk once.

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    No experience but revlok is no longer in business of motor cycle clutches I believe. :ear
  17. mrgizmow

    mrgizmow Been here awhile

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    Us TW folks seem to be rather conservative when it comes to spending money. With that in mind, I don't think we are the group to ask, even though the clutch is installed on a TW. Try asking the same question of the Honda/Yamaha/Suzuki, 250-400cc group. Gerry
  18. Solomoriah

    Solomoriah likes the back roads

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    Just discovered what I don't like about the Ricochet bash plate... 'cause it was time to change the oil. It's tricky enough to get that darn plug back in anyway, but with the bash plate in the way it's a real bear.
  19. Dr. John

    Dr. John Adventurer

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    I rode the bike yesterday,and it's not really anything I'd do to anything I rode.It seems like it's pretty hard on the tranny because it's not a very smooth shift,it's almost like clutchless shifting before the revs are low enough. It does keep the bike from moving while in gear till the throttle is rolled on,but that seems to be the only benefit,at least for me as I wanted my wife to be comfortable riding it,but it hits too hard when shifted to be an enjoyable ride for her. That's just my thoughts on it,I've heard great things on these things when offroaded. This setup was done by a dealer,and had very few miles on it,so it may need to break in a bit. Just sayin.:wink:
  20. Kwizard

    Kwizard Conservative

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    If you decide to sell; please let know. I'll pay a fair price, and give you a very good used set of friction disc(less than 2K easy miles) to replace it with.