Any ideas

Discussion in 'General Questions' started by dougsr.874, Dec 26, 2014.

  1. dougsr.874

    dougsr.874 Active Member

    Been doing these 2 strokes a long time but this one has be whipped.....66cc...has bluish, whitish spark at carb...compression tester jumped to over 200psi but then fell (is that normal?)...still engine won't start.....have checked everything with no to all suggestions...

  2. birdmannn101

    birdmannn101 Member

    Sounds like your running too hot and with a lean mixture. Check your oil/fuel mixture and your high speed jet.
  3. darwin

    darwin Well-Known Member

    Have you tried spraying some gas/quick start into the carb? Does it fire up? You have a good blue spark so it must be fuel. Do those have a sheer key on the crank/fly wheel? If it shears just a tad it can put it out of time. Do you have good suction at the carb intake when turning over, if not one/more of the reed flaps might be messed up.
  4. crassius

    crassius Well-Known Member

    when I see high compression like that, I usually start checking for a bunch of oil in motor - drain carb & check that user didn't try to mix fuel in tank & get a blob of pure oil down into bowl
  5. HeadSmess

    HeadSmess Well-Known Member

    same old same old.

    change the plug to a ngk.

    remove carb, insert petrol down intake.

    attempt start. if starts... carby. if not....something in engine, which can be either bad timing (check magneto+key), bad plug (we changed that though!) or busted crank seals (usually the one under the magneto). replace cruddy chinese seals with these...

    very rare...make sure the head itself is electrically connected to the engine!

    blocked exhaust?