Engine Trouble 66cc Engine won't consistently pop, won't work well unless at downhill

Discussion in '2-Stroke Engines' started by AshOnABike, Jan 1, 2017.

  1. AshOnABike

    AshOnABike New Member

    My friend gave me his 66cc (dissasembled, I had to replace the rings and put it together) engine kit and bike for $40, but the engine will only fire powerfully 1 in every 5 or 6 strokes. I feel the engine jolting me forward every successful pop but it's not consistent. I cant even ride on completely flat land unless I pedal and even the smallest incline will kill my engine. I also weigh 200lb if that has anything to do with it.

  2. crassius

    crassius Well-Known Member

    will it idle properly? does oil show up around head gasket?
  3. AshOnABike

    AshOnABike New Member

    Nope won't idle. All gaskets are secure. I think it's a problem with the AF mixture as lots of unburnt fuel comes out of the exhaust. Have you any idea on how to fix this?
  4. Street Ryderz

    Street Ryderz Active Member

    Have you checked that the spark is constant and that all wiring is correct and grounded well!
  5. crassius

    crassius Well-Known Member

    my first guess would be motor full of fuel from having petcock turned on when motor was not running (smokes a LOT when running, runs weak - has to be kept running for quite a while to clear out) - less common, is that I've had two guys come to the shop last month with NTTC carbs with chokes that had come loose & stayed on all the time (open filter & check nut that holds choke plate to lever) - rare, is main jet fell out or slide needle fell in)
  6. sp1ke

    sp1ke Member

    my first thoughts are

    timeing is it out ? key at 1 o clock when tdc right way up not 11 o clock
    or just far out of place

    and have ports or piston been altered?

    or an airleak

    over or under fueling isues at carb
  7. Corey l criss sr

    Corey l criss sr New Member

    ........fyi. change your megnet and you cdi. Your clutch is one knocth to tight.