1976 suzuki ds100

Discussion in '2 smokers' started by clicheche, Apr 19, 2013.

  1. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    i have spark, and fuel is getting to it.

    i cleaned the carb. are there any settings or adjustments to the carb that could not allow the sucker to fire up?

    air flow is good as well.

    kill switch is in the 'run' position.
    there is no battery on the bike, but this shouldn't matter right?


    any ideas?

    update: plug was soaking wet. will this definitely halt it from firing up?
    #1
  2. Andyinhilo

    Andyinhilo Long timer

    Joined:
    May 16, 2008
    Oddometer:
    1,763
    Location:
    Hilo, Hawaii
    Wet plug will definitely keep it from starting. You need to find out why it is wet, too. Did you flood it, is the float needle working, etc.?
    #2
  3. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    i believe the float needle is working. it moved when i played with the float upon taking apart and cleaning the carb.

    so it never even had a gas tank when i bought it. not sure how many years its been since it was running. the carb was seized. i may have had the choke on and tried kicking it quite a few times before i ultimately tried roll starting it.

    it puttered pretty good and almost sounded like it wanted to fire.
    could the quality of spark be an issue?
    i considered replacing the plug, but i saw spark when testing it, so figured it would be fine.

    i'm gonna replace the plug and then try roll starting it tomorrow.
    would the ignition coil, (for lack of a better term...maybe that's accurate) need to be replaced? due to lack of quality spark firing?

    would taking the air filter off help, or matter?
    #3
  4. FR700

    FR700 Heckler ™©®

    Joined:
    May 4, 2007
    Oddometer:
    11,243
    Location:
    Your imagination.
    Clean/replace points.

    Fresh plug , B8ES.

    .
    #4
  5. 2TICKLASSIC

    2TICKLASSIC Adventurer

    Joined:
    Apr 6, 2013
    Oddometer:
    30
    Location:
    masshole
    What color is the spark ?
    #5
  6. Andyinhilo

    Andyinhilo Long timer

    Joined:
    May 16, 2008
    Oddometer:
    1,763
    Location:
    Hilo, Hawaii
    NEW PLUG! The float needle may be free, but you need to be sure that it is actually shutting off the fuel. The seat and needle tip could be damaged and/or a a bit of trash could be there as well.
    #6
  7. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    the new plug b8es sucks.

    tiny little spark.

    the old plug sparks better.

    that being said, the spark color, (though much smaller) was more blue on the new plug, and orange on the old plug.

    will consider the points suggestion.

    is compression difficult to test?

    could that be an issue?

    will check the carb again as well. how to tell if the float needle would be stopping the gas flow?
    #7
  8. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    what components of the carb deal with starting? pilot jet? float needle and jet?

    anyone know where one can get their hands on a carburetor rebuild kit?
    1976 suzuki ds100
    #8
  9. Andyinhilo

    Andyinhilo Long timer

    Joined:
    May 16, 2008
    Oddometer:
    1,763
    Location:
    Hilo, Hawaii
    Blue spark is better than orange. Compression is easy to test if you have a gauge.

    The easiest way to test the needle is to see if you can blow into the fuel inlet after the float bowl is full.

    Starting fuel delivery is controlled by all the circuits, dependent on throttle setting. you also need to make sure that the enrichener is shutting off completely.
    #9
  10. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    thanks all!

    the enrichener? like the air/fuel screw? sorry, i don't have a manual for the bike/carb

    (compression does seem simple enough to check. just need the gauge)

    will give a blow into the inlet. what am i looking for? if i am able to blow into it?
    #10
  11. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    new data:

    float bowl was bone dry. could this be related to non-starting issue? :D
    the float needle was extremely tight in the jet, had to pull it with pliers. it was gunged up, but not around the point of the needle. the needle looks to be in pretty fair shape. is the needle supposed to rest on an o ring in the seat? because there wasn't one there.

    how could i have had a wet plug with a bone dry float bowl? (i had the choke engaged, and i kicked it many a time)

    3 more!
    is kerosene an acceptable safe cleaner for carbs?
    is the foam air filter to be oiled like most on this bike?
    could a leaking petcock be of issue? (in process of fixing it)

    thanks for all the help everyone! immensely appreciated
    #11
  12. Andyinhilo

    Andyinhilo Long timer

    Joined:
    May 16, 2008
    Oddometer:
    1,763
    Location:
    Hilo, Hawaii
    Good luck.
    #12
  13. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    excellent help!

    will update with some info once i reassemble etc.

    the float needle being seized, could that have completely blocked fuel entering the bowl? i suppose that's the only and obvious reason...

    super gracious.

    measured excitement!
    #13
  14. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    newer data:

    i got the sucker running! for 20 seconds or so at incredibly high idle speed, smoking white smoke like hell and then it quit. (engine would rev even higher when i pulled some throttle, if that's worth anything)

    this was after the carb finally got fuel to the bowl, and i adjusted the points so that the connection gap (unknown term) was shortened or made smaller than originally set. (the nut on the crankshaft was also quite loose.)

    the plug had some oily spots, darker in color, but wasn't extremely wet.

    the enrichener was not engaged, the air screw on the slide was screwed in quite far, (raising the slide) should it be screwed out more or less, as far as more or less air for idle?

    concerning the idle speed, why would it not want to start when the points were gapped further?

    i was ordering a new points plate and condensor... should i just replace this? could it be a bad condensor? or is my point adjustment to small?(concerning really fast idle)

    ever grateful for the help folks, it wouldn't be running if it wasn't for you!:clap:clap
    #14
  15. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    i freaking owe you guys!
    #15
  16. Andyinhilo

    Andyinhilo Long timer

    Joined:
    May 16, 2008
    Oddometer:
    1,763
    Location:
    Hilo, Hawaii
    Once again, good luck
    #16
  17. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    it will run 'lightly' for about 5 seconds, light blue smoke, and then putter out. completely different from the intense revving and white smoke yesterday.

    it appears its just tweaking carb... and seals wouldn't hurt i'm sure. winter job

    lining up the points gap mark with the flywheel cover doesn't allow the bike to start.

    will adjust the carb ( i know which screws you are talking about, thank you for clarity) and go from there. it seems close folks.
    #17
  18. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    it will start, and idle for a good half minute, but lightly. the second i pull any throttle it quits. it MUST be too rich right? i can't seem to adjust the carb properly.
    yikes.

    it seems 1 and a half turns out on the fuel/air screw is the best bet so far. i'm just wondering if its the timing.

    could the condensor be worn out, and not sending a consistent, good spark? plug wire? like i said earlier, i have spark, but i can't tell if its of the quality and rate it should be. etc.

    as for the screw on the float bowl, which screw is this? i know it deals with fuel/air, just not sure how. it has no spring to tension it in place if it is turned out much.

    last pondering. could my float height be of issue? it seems when i lean the bike back a bit while on the stand it idles much better... could the bowl have too much fuel in it?
    #18
  19. Andyinhilo

    Andyinhilo Long timer

    Joined:
    May 16, 2008
    Oddometer:
    1,763
    Location:
    Hilo, Hawaii
    Does it smoke heavily? Can you slowly open the throttle without it dying? Do you have to choke it to start? These would be the symptoms of running rich at this stage.

    I don't know of any adjustment screws in/on the float bowl. Only thing I can think of there is the drain. The float level could be an issue as well.
    #19
  20. clicheche

    clicheche Adventurer

    Joined:
    Apr 1, 2013
    Oddometer:
    72
    Location:
    Calgary, Alberta, Canada
    doesnt smoke heavily.

    don't have to use choke to start it.

    it was odd. ONE time it idled great, and i could pull throttle, making it rev well and strong. other than that, when i pull on throttle it dies.

    i could potentially lower the height of the float?

    ya, i believe the screw on the float bowl is the drain. it must be.

    thanks!

    ps: does this choke/enrichener block our air or fuel? i've heard some do one or the other
    #20