cant get cylinder on piston

Discussion in '2-Stroke Engines' started by daveet66, Aug 20, 2016.

  1. daveet66

    daveet66 Member

    ok i too heaD cylinder off piston! now i cant get it back on anyone got any advice?

  2. butre

    butre Well-Known Member

    make sure the rings match up to the pins in the grooves, and hold the rings in place with your fingers. it should slide on with ease.
  3. jaguar

    jaguar Well-Known Member

    the rings have to be compressed so that the ring ends are almost touching, all the while the ring ends are centered over each ring location pin.
    There are two ways to do this. Try them both so you'll know in the future which is easier for you:
    1. put the wrist pin into the piston only partially so that the connecting rod has its free space for installation. put the piston into the cylinder so that the ring ends are on the intake side of the cylinder. Then make sure the connecting rod bearing is in place and put the cylinder with piston into place. Holding it up so that the connecting rod is ready to receive the wrist pin go ahead and tap the pin into place. Then install the circlip while a rag is covering the open crankcase to prevent it from going down there in case it flies off.
    2. install the piston onto the connecting rod and then slide the cylinder down onto it and press the top ring till it slides into the cylinder. then do the same for the second ring.
  4. daveet66

    daveet66 Member

    Thanks got it on but now the back wheel is stuck!I can't seem to find a mechanic i am screwing everything up!
  5. crassius

    crassius Well-Known Member

    take spark plug out and get back wheel off ground - try to turn motor by turning the nut on the rotor

    if it doesn't turn, you may have to open top end again to look inside (assuming motor turned before putting piston in)
  6. Frankenstein

    Frankenstein Well-Known Member

    Check for a jammed chain first, pull the clutch arm cover off and look for bunched up chain.
  7. Rjb13074

    Rjb13074 New Member

    Be sure your rings are not upside down. The placement pins on your piston is seated on the top side of the ring groove. On your ring opening,the cut out is shaped like an "S" or "/" on both ends. The larger opening of the ring goes up and the smaller opening down. If you have ut backwards, the ring will not compress fully and will be too tight on cylander wall that will cause seizing of the engine.
  8. Frankenstein

    Frankenstein Well-Known Member

    Did you notice he got it together? Rings wouldn't install upside down even if you wanted them to unless they were damaged on the ends.