Suzuki TS400 Spark Help!

Discussion in '2 smokers' started by johmarq, Jun 26, 2012.

  1. johmarq

    johmarq RottenMongrelBastard

    Joined:
    Nov 16, 2007
    Oddometer:
    140
    Location:
    Australia
    Hi all,

    I'm hoping there might be some Suzuki TS/TM gurus here that can help me with a problem I'm having with my 1973 TS400.

    I just purchase it, She had been sitting for 30 years, and only has 385 genuine miles.

    Did all the usual stuff, cleaned and lubricated, new oil etc etc.

    Started right up on second kick.... yipeeee :clap

    over the next weeks started real easy, but today tried again, no start... fuel good but no spark.

    Did the usual again, changed plug, checked leads and connectors, Kill switch etc.... still no spark :becca

    tested the coil, seems ok,

    Now while stuffing around I noticed that after kicking it over, and getting no spark I happened to press the kill switch,

    and there you go one full strong spark, but just one.

    I can repeat it over and over, kick it over and then press the switch and get one good spark.

    Now my question is .... has anyone seen this before?

    Is it the CDI unit, coil or maybe a bad wire or earth?

    really appreciate any help you can offer.

    before I start laying out hard cash

    while here does anyone know if the CDI units from other Suzuki bikes are compatible ie: PE, other TS or TM etc.

    Cheers in advance

    John
    #1
  2. PFFOG

    PFFOG Richard Alps-aholic

    Joined:
    Aug 19, 2005
    Oddometer:
    4,346
    Location:
    Western NY, further from NYC than 6 entire states
    First think I would do is disconnect the wire going to the kill switch AT the cdi unit plug. Could be as simple as a shorted switch.

    Then check all connections and grounds, anything sitting for 30 years probably has some corrosion.
    #2
  3. johmarq

    johmarq RottenMongrelBastard

    Joined:
    Nov 16, 2007
    Oddometer:
    140
    Location:
    Australia
    Yep, I did that, the switch is good.
    also have checked, cleaned and re plugged the wiring.
    I will be testing the wiring with a meter tomorrow

    Just don't get why I get a spark when pressing the kill switch:scratch
    #3
  4. PFFOG

    PFFOG Richard Alps-aholic

    Joined:
    Aug 19, 2005
    Oddometer:
    4,346
    Location:
    Western NY, further from NYC than 6 entire states
    Possible trigger coil is bad, been a LONG time since I played with these systems. Remember there is an energizing and trigger coil though. One charges the cap, one triggers it to discharge. It would make some sense that they discharge the unit when you hit the kill switch, to prevent an unwanted zap.
    #4
  5. johmarq

    johmarq RottenMongrelBastard

    Joined:
    Nov 16, 2007
    Oddometer:
    140
    Location:
    Australia
    Hi Richard,

    So, the fact that there is a charge there, Would that indicate that the CDI and coil are working correctly?
    and if you think about it also the energizing coil as the charge has been sent to the CDI Cap.
    Yes ....No???
    will definitely look for the trigger circuit.
    #5
  6. Shocktower

    Shocktower Long timer

    Joined:
    Jul 27, 2009
    Oddometer:
    9,535
    Location:
    Oregon City Orygun
    Some things I would change when a bike has sat that long is change the main seals alway change them, on a sitter. :evil
    #6
  7. johmarq

    johmarq RottenMongrelBastard

    Joined:
    Nov 16, 2007
    Oddometer:
    140
    Location:
    Australia
    Bugger Me, the problem disappeared!
    I spent the morning chasing my no spark problem,
    then after lunch and a break got back into it and stuff it it's working!
    Put it all back together and it rides just fine
    You just gotta love these old bangers!
    Must be a bad earth or a broken wire somewhere.
    I bet It will come back and bite me it the bum at the worst possible place and time!:wings
    #7