New 2 stroke Mitsu clone hard to crank.

Discussion in '2-Stroke Engines' started by andyszyd, Oct 19, 2009.

  1. andyszyd

    andyszyd Member

    I have a new 52cc Mitsu clone trying to break it in.
    After a few tanks of 87 gas and 25:1 Penzoil 2 stroke oil running at variable speeds low to about half throttle. Now it is harder to crank it, it feels like it wants to backfire before it even turns no more than 1 or 2 times.

    Today I was able to start it once, was runing good about 20 min, after it cooled down, same problem but getting worse.

    When I remove sparplug it turns smooth and easy, so the problem seems to be compression or/and timing or what? I do not have experience with small 2 stroke engines besides 2 stroke Ryobi weedwacker which was kind of temperamental, but never acted like this

    Any hints will be apprecciated as to where the problem might be?

  2. andynogo

    andynogo New Member

    Could be anything. Check that your timing isn't too far advanced- it's possible it may have slipped.
  3. andyszyd

    andyszyd Member

    I removed sparplug and put few drops of oil in. It seemed to help, also I run richer mix now, 20:1 instead 25:1.

    The manual sucks, no word about anything, this lousy manual is a poor copy of 4 stroke engine manual, they are talking about chainging oil after 20 hrs of operation LOL!