Hello from the Dessert

Discussion in 'Introduce Yourself' started by Maddmatt, Sep 28, 2008.

  1. Maddmatt

    Maddmatt New Member

    Hi, I'm Matt. I'm in Tucson, AZ. It's hot.

    I found this forum when trouble shooting my 4 stroke, joined up to explain my issue and I hope someone has an idea what is wrong.

    I'll just jump in. I'll post it in the proper section too. My 4 stroke (china) ran fine, but then sat for 3 months. I've stripped down the carb and cleaned every nook and cranny but it only idles with the choke on and the second i turn the choke off, it revs up and dies within seconds.

    It's driving me mad. I can't for the life of me figure out whats wrong.

    The spark plug is good and gapped correctly
    There are no air leaks between carb and engine
    Wires are all connected correctly (kill switch etc)
    New gasoline, 92 octane
    gas cap is vented correctly
    black hose from air intake is connected with the engine block
    Air/fuel screw is currently at 2 1/4 turns out
    New oil in sump

    If I leave the choke on it will idle for ever, the second I take it off it revs up, tries to take off and dies. WHY!?!?!!

    Help me.

  2. Mountainman

    Mountainman Active Member


    I seem to hear a lot about -- those floats needing adjustment at times ??

    just a guess
    usually a float -- just keeps doing it's job
    but noted -- this may be one weak spot with these engins ??

    ride that thing - Mountainman
  3. Maddmatt

    Maddmatt New Member

    how do you adjust the float?
  4. Mountainman

    Mountainman Active Member

    good Sunday morning

    if by chance you are in need of more gas in the bowl

    a slight bend where float is connected

    so as for float to ride higher in bowl

    thus more gas will be in bowl..

    sounds like you my be starving for gas ????

    ride that thing Mountainman
  5. BoltsMissing

    BoltsMissing Active Member

    Check the main jet in the carb for gummed up old fuel. May need to blast it with compressed air.
  6. Maddmatt

    Maddmatt New Member

    Done that. No effect

    Opposite. The bowl is full, I'm wondering if it could be two much fuel.
  7. Mountainman

    Mountainman Active Member

    not sure -- but you mentioned ran a little with choke on

    thinking that is usually caused by lack of fuel ???

    kind of early here -- coffee kicking in -- ???

    ride that thing Mountainman
  8. Maddmatt

    Maddmatt New Member

    The bowl is full. When I took off the carb it full. I was surprised how much gasoline was actually in the little sucker, it just kept pouring out.

    Plus, it wouldn't explain why the engine "revs" suddenly before it dies. It doesn't make any sense to me. It really revs, if it's sitting under it's own weight it spins the tire enough to burnout a little and try to take off.
  9. stude13

    stude13 Active Member

    the reving is caused by a lean condition. you said no air leaks. i say yes air leaks. spray starter fluid at carb connections and base gasket and around the head bolts.
  10. Maddmatt

    Maddmatt New Member

    I've dressed all the gaskets and checked for any air leaks and I can't find any between the carb connections.

    que? What base gasket? Are the head bolts the 4 securing the valve cover?