Suzuki ts 400

Discussion in '2 smokers' started by Bon Scott, Mar 5, 2013.

  1. Bon Scott

    Bon Scott n00b

    Feb 27, 2013
    Torquay England
    Hi, I have a suzuki ts a 400 1976, and I am not happy.
    The question is , is the bike fundamentally flawed or although I think I've tried everything is there a fix , that I haven't.

    List :
    Crank seals
    2 x carburettors rebuilt
    Burnt out exhaust
    CID checked
    Points and timing
    The bike looks very original, but won't run clean top end and misses on quarter throttle.
    Any help would be appreciated.

    Cheers rob
  2. wfopete

    wfopete Suffer Fools; Gladly!

    Aug 19, 2004
    Somewhere North of Dover, AR
    I have one too. Ran better than yours. Are you running premix or injector lube? I just keep with the injector because to bypass it is a hassle. Mine didn't run great but it got the job done. Terrible fuel mileage and the motor ran all over the place from decent to crappy.
  3. mudgepondexpress

    mudgepondexpress Long timer

    Jan 11, 2007
    Spokane, WA
    Does it stutter on the top end or does is feel fat? Sounds like you need to do some jetting to me. I don't think I have ever seen a 70's 2 stroke from Japan that wasn't overjetted from the factory. If you haven't tried it yet, pick up 1 richer and 1 leaner main jet. Start with the richer (bigger) jet and see if it makes it worse or better, my bet is it will be much worse. If I am correct, go to the 1 step leaner and keep going until it runs out clean.

    Once you have the main jet dialed in, then go to work on the pilot and/or needle. I would work the same system on the pilot and see how it affects the bike, then work from there.

    Yes, you will have a handful of jets when you are done, but it will feel good when it runs correctly. You will also learn how to pull the carb quicly and how little you need to disconnect to do it. I became quite good at the parking lot pull...leave the fuel line and throttle hooked up, loosen the carb, put a rag under it, pull it out far enough to remove the bowl and replace the jet. All told I could do a Yamaha DT in less than 5 minutes, a XR650L in roughly 8 (by leaving off those ugly scoops).

    If the bike is not consistant in its running...sometimes good, sometimes bad, you will need to look at the spark advance system to see if it is operating correctly. I believe this was a common issue to the big ts/tm series (though this is from memory...they could have fixed it by 76).

  4. Aah5

    Aah5 russ

    Feb 28, 2009
    I had TS400-K back in '75/76 when working at Suzuki dealer, bike was a tradein that had was absolutely gutless 80 kph/50 mph tops.
    Picked it up at our traded price and proceeded to make it run properly. Opened up the air box intake vents, rejetted carby, burnt out the exhaust carbon, decoked the exhaust port etc.
    Anyway after a lot a fussing around, mainly jetting, in the end I had a TS that was capable of a genuine 160kph/100mph, had a flat torque curve and was an absolute blast to ride on the street not so good on the trails.
    Persist with jetting and make it breathe better.
  5. mikejohn

    mikejohn Long timer

    Sep 15, 2007
    Nashville TN
    What is TS 400 worth these day? Not looking for a restored bike, just one that runs or needs a little work to run.
  6. spo123

    spo123 Man About Town

    Nov 7, 2006
    North Shore Mass. USA
    Do NOT run premix on any Suzuki 2 stroke, except MAYBE the PE and RM series!
  7. mikejohn

    mikejohn Long timer

    Sep 15, 2007
    Nashville TN
    I am looking around for a TS400. All I want is the motor, electrics, oil tank and the pipe.
    Why you ask? Well I have a 77 AW Maico frame and some 17" wheels:evil
  8. Duck_Pilot

    Duck_Pilot Retired Roadracer

    Jun 13, 2007
    Denver 'Burbs, Colorado, USA.
    Correction: Don't run premix in Suzuki's designed with oil injection. Why?

    1): Many have shrouds ("slingers") over the crank's main bearings, to help keep the oil in, from passages in the crankcase. Unless these are removed, premix oil will not properly reach them.

    2): You will be opening up a can o'worms trying to get the jetting correct, because premixing will mean less fuel through the jets. That may lead to overheating and seizures, unless you compensate for it.

    PE's and RM's are designed to run premix.
  9. thejunkman

    thejunkman Been here awhile

    Jan 12, 2015
    Follow THIS ^ advice.

    I also wrote about this topic generally in an article years ago for a magazine and republished it on my site.

    2 stroke oil injection myths