sticky throttle

Discussion in '2-Stroke Engines' started by elwood, Apr 15, 2007.

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  1. elwood

    elwood Guest

    the brass piece inside the carb is very very tight and the spring isnt pushing it back down this caused the throttle to jam launching my like a rocket ship, its really tight, any ideas why?

  2. Hugemoth

    Hugemoth Guest

    Are you sure the cable isn't the problem? First I would take the cable out of the throttle slide and see if it moves freely. If it doesn't I would look for a burr on the surface of the slide.

  3. Guest

    Guest Guest

    Sometimes the slides in these carb are too tight and stick....remove the slide from the carb and make a "tube" of paper. Use some 400 wet or dry sand paper and water and sand the slide a little, clean it off, then test fit it. I won't take much, so don't get carried away. sand a little, test, sand a little, test.
  4. JosephGarcia

    JosephGarcia Guest

    Yeah, sand it down lightly and refit, inspect it visually, if u can see dings or dents in the brass, sand those down, same problem happened to me. Also lube the cable inside its sheath if you have it making some tight bends.
  5. ringal

    ringal Guest

    Sticking slide

    Just a quick comment on sticking carby slide...... The metal that the carby is cast with is very soft and by over tentioning the screw top that holds the throtle cable can cause the slide chamber to close up and jam the slide..... Also over tentioning the carby mounting screw can cause distortion and jam the slide as well..... I have had this problem on one of my engines...

    Regards Al
  6. Guest

    Guest Guest

    Exellent observation!
    Good thing to remember.
  7. Tom

    Tom Active Member

    I just called my sticky throttle "Cruise Control". I could go WOT and then ride up the street with no hands. Then I really got some looks.
  8. JosephGarcia

    JosephGarcia Guest

    HAHAHAH! Nice. I got looks, but for different reasons.

    I have a fear of internal combustion engines (don't laugh), and when my throttle stuck, I completely freaked out. Jumped off my bike and watched it ram a parked car and die off after 10 minutes. Everyone in the party accross the street had to laugh at the guy who fell off his bike screaming "OH MY F****ING GOD ITS ALIVE!"

  9. azbill

    azbill Active Member

    :lol: :lol:
    I had the same problem, I sanded the brass cylinder inside a tube of wet/dry sandpaper.
    I did this a few times, a little at a time, till it slid smoothly
  10. elwood

    elwood Guest

    ok i tried sanding it, cleaning it, everything, still sticks,
    bought new cables, new throttle, i think the carb is bust.
    now looking for a doner carb or someone who can send me a quote for one plus shiping to uk. thnx
  11. Guest

    Guest Guest

    FYI- I had to sand mine for a long time, around a half hour if I remember.
  12. elwood

    elwood Guest

    well, i grinded it with the dremel to get rid of the chunks then sanded it for about 10 minutes using my sand paper, then buffed it, did the same with the brass slider, apart from using the dremel on it,
    its really getting on my nerves now
  13. rcjunkie

    rcjunkie Guest

    Get a brake honing tool and hone out the carb cylinder. I suspect that it is no longer perfectly circular due to poor machining.
  14. gone_fishin

    gone_fishin Guest

    also take note re: my personal experience.

    if i over-tighten the "cap", it warps the cylinder enuff to bind up the slide at the top of travel. slightly loosen it & it's just fine.
  15. Chopper

    Chopper Guest

    Just wanted to bump this up as I just did this to mine.
  16. Scottm

    Scottm Guest


    I didn't even bring my bike home because I was afraid I would end up in the ER. It too launches like a rocket and the tire was squeeling through the parking lot at work. I popped the kill switch and pulled the clutch. I let the bike roll 100 yards before I hit the brakes. It was really cool to see it work so well.

    I'll try your tips tomorrow.
  17. wolverene13

    wolverene13 New Member

    Nub inside throttle cylinder

    There's actually a little nub inside the cylinder where the brass piece goes...the slit in the side of the brass piece has to line up with the nub or else it will not slide up and down properly.