carb needle?

Discussion in '2-Stroke Engines' started by linnix13, Apr 12, 2009.

  1. linnix13

    linnix13 Banned

    my throttle cable broke so i had to replace it. well i took the slide off and i see the long yellow needle that sticks out the bottom. the needle fell out the top so i picked it back up and put it into the slide, i then replaced the cable but i noticed that with it all assembled the needle will move up into the slide if i push it. i dont know if this is normal. i put it all back together and have ridden about 60km so far and it seems ok. i just wanted to know if the needle is supposed to have a washer on the top inside the slide so it wont move up into the spring. but like i said it runs fine so im wondering if that was normal, im just paranoid. thanks guys!

  2. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    The needle has a black circlip into one of the grooves on the top

    A silver slotted washer goes on top of the black circlip inside the slide

    then the spring

    The slot in the washer is so the "acellerommeter" cable and top
    of the needle can pass through

    sounds like you lost your washer........
  3. linnix13

    linnix13 Banned

    yes there was no washer. what will this do if i continue to run it this way
  4. linnix13

    linnix13 Banned

    oh also will any washer i can get at canadian tire work aslong as it fits inside the slide?
  5. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Sure, just file / saw a slot into the washer that matches the slot in
    the slide body so the throttle cable and top of the jet can pass through it

    As long as it holds the clip down you will be good to go :grin5:
    Last edited: Apr 12, 2009
  6. linnix13

    linnix13 Banned

    it still works without the washer though. how come it still works if it needs a washer?
  7. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    It would probaly run OK unless you loop the loop once in a while :jester:

    Gravity will tend to keep the needle down where it belongs but it
    should be held in place. That is the way they come from the factory

    These carbs are so crude, simple and basic. They even sort of run with
    the jet completely unscrewed and loose in the float bowl.....
    Last edited: Apr 12, 2009
  8. linnix13

    linnix13 Banned

    ok thanks i appreciate the info, so what would be the worst that would happen if the needle came up. would it seize or just stall?
  9. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Seize??? No way!! that isn't possible

    Stall? I doubt it.....

    Might run a little rough

    You have been running it with no discernable problems, but
    your question was if there was suposed to be a washer in there.
    Yes, there is.

    I found a bunch of similar shaped and sized C washers in the neighbors
    trash that work.
    They rebuild fuel injectors and other stuff

    PM me your address and I will mail you one gratis
    you can drag a magnet around where you took your carb apart :jester:

    Nothing wrong with a little healthy paranoia! :devilish:
    Last edited: Apr 12, 2009
  10. linnix13

    linnix13 Banned

    well now that you mention it it has been a little off but i thought that that would have been because i installed the boost bottle at the same time as i lost the washer. i will go look around my garage its gota be on the floor somewhere. Canadian tire is just down the road so i can buy a washer for like 13 cents but thanks allot i appreciate your offer
  11. linnix13

    linnix13 Banned

    found it!

    haha i went in with a magnet and the second i bent down it picked it up! thanks for the idea i never new there was suppose to be a washer or what it looked like or if it was metal. thanks it seems alot smoother. so what does the needle do? i know the slide alows more air into the manifold, does the needle alow the fuel in? oh and this is the bike by the way.

    oh yea! finally im no longer a newbie!
    Last edited: Apr 12, 2009
  12. will_start

    will_start Member

    I thort the washer went under the E clip.
    I have always been doing it this way.
    But I'm no authority on the matter.
    Hmmm, more research needed.
    Last edited: Apr 12, 2009
  13. linnix13

    linnix13 Banned

    yeah does it? i would like to know
  14. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    If ya look inside the slide body you will see a depression in the
    bottom that matches the diameter of the "C" clip on the needle.

    Then the slotted washer goes over the top resting on the shoulder
    inside the slide

    Then da spring holds it all down,,,,,,,
  15. linnix13

    linnix13 Banned

    ok thanks
  16. will_start

    will_start Member

    If someone finds a reliable link,
    you know what to do, post it here.

    my bike is not running, so its a mute point for me really...:whistling:
  17. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    You probably have your washer in the wrong place :jester:

    I don't need no stink'in link :grin5:

    I seen hundreds of these motors and carb's

    That would be "moot" but I guess it would be silent too.....:whistling:
  18. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member
  19. arceeguy

    arceeguy Active Member

    Forbisher is correct. (we don't need no stinkin' links)

    Think about it, if the C washer is below the C clip on the jet needle, it will:

    A: not secure the jet needle to the slide.
    B: move the jet needle higher, enriching the fuel mixture.

    There is a set of instructions posted on the internet somewhere that incorrectly shows the assembly order. So don't believe everything you read on the internet!
  20. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    I started pullling apart the carb on my new Grubee 50 cc Gen II motors
    with steel liner, angle fire head and longer bent clutch arm.

    The carb bolts right on the back of the cylinder with no inlet tube
    and has it's own fuel shut off

    The slide is smaller in diameter but longer

    The needle has 5 positions and the clip is much smaller in diameter

    Even the washers are NOT interchangeable

    Unfortuneately the carb still has no mixture screw

    Going to be interesting to see how these motors run, gonna put
    one on a cruiser as the motor has a large front tube diameter
    of 1 3/8" and still has plenty of room to enlarge it to 1 1/2" as
    the front studs are much further apart

    The rear mount studs are standard but the mounting block takes
    a larger diameter too ( can use a standard seat post mount as well )