Take on 2 stroke from a FNG

Discussion in '2-Stroke Engines' started by chain, Jun 11, 2015.

  1. chain

    chain Member

    Hey,
    So just getting into this and I hear a lot about ...are these engines good are they any
    different from one to the other . All I know is I got a engine 80cc kit off ebay new with shipping
    for $ 110 !!!. Now I'm not rich but I do have a Harley that I built and work on my self . It cost me about $50
    to do just a oil change on it . So If this motor last me a year I'll be happy, pull It off and get a new one .
    The only thing I thought was crap is that rear sprocket rag thing so I got a Hub adapter that works great .
    I also included a few pics Of my motor brake down in case someone doesn't have it . My bike is also a Kent La Jalla
    That i'm sure some will say is crap but if you grease it and adjust it I think It will last . I have a Genesis 2100
    that I beat the heck out of and it still rides great .
    This is a awesome site and I appreciate all you guys have shared .I'm psyched to get more into this , It's a
    great hobby !!!
    Thanks
     

    Attached Files:


  2. crassius

    crassius Well-Known Member

    At that price, I'm guessing it is one of the pre-2012 motors. These aren't horrible (everyone used them until 2012), but they do then to vibrate a lot over 25mph or so.

    These kits are as reliable as the builder (so don't expect a lot out of your first time building unless you're an awesome mechanic).

    read a lot here & learn how best to do it
     
    chain likes this.
  3. chain

    chain Member

    hey , Thanks man I will . How can you tell a pre 2012 ? i included a motor breakdown so what is the difference ?
     
  4. butre

    butre Well-Known Member

    pre-2012 motors were balanced for 50cc bore and stroke and needed a considerable amount of work to not shake your teeth out
     
    chain likes this.
  5. chain

    chain Member

    Hey , you telling me that being balanced by some 12 year old chinese kid is going to make a difference ??
    lol thanks man .
     
  6. crassius

    crassius Well-Known Member

    there are many ways to balance a crank for the same engine for power or speed or smooth running - I've seen no reports on what anyone is balancing for in these, so I usually just call them machined cranks because they are much lighter overall

    I certainly like the smaller mains that eliminate the external seals too.
     
  7. butre

    butre Well-Known Member

    you'd be surprised, I just measured the runoff on the best crank I ever had and the worst crank I ever had. The best had an 8 tenths runoff and the worst had a 65 thou runoff. the 65 thou one came from an engine made before 2012
     
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