Piston will not go low enough in cylinder for intake

Discussion in '2-Stroke Engines' started by Hulk_Hogue, Jan 4, 2013.

  1. Hulk_Hogue

    Hulk_Hogue New Member

    My first post here, hoping you all can help.

    As the title says, the piston of my kit doesn't go low enough in the cylinder to reach the intake port at all. It's a brand new HT kit that hasn't turned over once. Below are some pictures.

    Photo01040421.jpg Photo01040421_1.jpg

    In each of these, the exhaust port is on the top of the photo. The piston is as low as it can go in its cycle. This makes the process come to a complete stand still, as the piston's fighting to compress/decompress nearly halts all movement.

    How can I fix this?

  2. Old Bob

    Old Bob Member


    I think you need to learn how piston port two strokes work.
  3. Fabian

    Fabian Well-Known Member

  4. Hulk_Hogue

    Hulk_Hogue New Member

    Ahhh, just learned up. Sorry, come from a car background; ports not opening usually mean a no-go.

    Great, now I'm stumped. I can't get this engine to turn over for the life of me and I've no idea what to do. The spark plug doesn't feel wet, nor do I know if it's even sparking while under compression.
  5. crassius

    crassius Well-Known Member

    Getting the first start out of these can sometimes be tough. I suspect that the rings need a few minutes running to get a good seat.

    Try hitting the tickler button on the carb till you see a bit of fuel leaking out. Try some choke.

    If the plug doesn't look wet, you can throw any old plug in that has enough deposits on it to show wetness easily & crank it without the plug cap on to see if you see wetness then.

    if not, then check your fuel lines for flow by removing to drain plug on the carb bowl.
  6. keatonx

    keatonx Member

    on a piston port 2 stroke, the intake is uncovered by the bottom of the piston, not the top. The transfer and exhaust ports however, are uncovered on the top of the piston. and in your pic I see them so its all good.
  7. jaguar

    jaguar Well-Known Member

    spark plug should be wet. check float height in fuel bowl. pull fuel line off of carb and see if fuel flows out.
    to check spark take the spark plug off, reconnect it to the spark wire, hold it onto the head with your hand (gloved if scared) in the evening or at night and push the bike causing the engine to turn over. it may only spark with a really healthy push. if no spark then ya got a problem.
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