Motorized bike not running

Discussion in 'General Questions' started by boogster, Sep 21, 2014.

  1. boogster

    boogster New Member

    We have one of these bikes and put about 100 miles on it. it lost about 30% power and then stopped all together and will not restart. We have checked for spark , fuel flow , and air flow and it has all three. We replaced the Magneto and the cdi. Also anytime when we try to start it, regardless of fuel setting, it continues to flood motor. Finally we have tried 3 different carburetors on it and no results. Any ideas?
     

  2. Fabian

    Fabian Well-Known Member

    What oil/fuel ratio was used?

    How hard was the engine revved?
     
  3. crassius

    crassius Well-Known Member

    loss of power before failure is almost always a gasket or seal failing - most usual is the head gasket leaking which will be found by looking for oil seeping between the head & cylinder
     
  4. Fabian

    Fabian Well-Known Member

    If that is the case, simply throwing another head gasket on the engine will either prove or disprove the theory.

    It's a quick and simple and cheap theory to test.
     
  5. boogster

    boogster New Member

    Thx guys. i will check the head gasket. Btw its a friends bike and i have one and we run 50:1 oil to gas and we use Saber Professional oil and i have over 2000 miles on mine and it runs like a champ. i just couldnt figure out why it would flood every time(by it i mean his bike not mine).
     
  6. boogster

    boogster New Member

    Replaced Head gasket and no luck. Any idea anybody?
     
  7. Fabian

    Fabian Well-Known Member

    I was fairly confident that it was not the head gasket.
     
  8. darwin

    darwin Well-Known Member

    How is it flooding, what makes you think that's the issue. 3 different carbs, that's a tuff one. Can the carb breathe properly through the air intake/filter with no leaks? Choke open all the way?..........................
     
  9. boogster

    boogster New Member

    Its the issue. we pull the plug after each run and its soaked and black. We have the air filter completely taken off for unrestricted air flow. yes choke is open all the way
     
  10. butre

    butre Well-Known Member

    look for blown gaskets around the intake plenum, the cylinder base, and the crankcase

    are you giving it gas while trying to start it?
     
  11. crassius

    crassius Well-Known Member

    have you tried loosening the muffler a bit to see if it is clogged?
     
  12. electron

    electron New Member

    Search how to check for spark and timing
    OR
    Crank space full of fuel, mainly oil now as the petrol has been evaporating. I bet the first carby had the needle and seat leaking. Need to blow out crankcase (ah, crankcase not crank space) or ride around with spark plug out (rag over hole or you'll b wearing it). The proof will b on the rag.
    Let us know how u go, it's important.
    And DON'T run it without any form of exhaust pipe.
     
  13. boogster

    boogster New Member

    yes i am giving it gas
     
  14. electron

    electron New Member

    Spark? Crankcase flooded?
    Read post 12, please.
     
    Last edited: Sep 30, 2014
  15. boogster

    boogster New Member

    We replaced the cylinder gasket and still no avail. the plug is no longer flooded as bad as before. and yes it has plenty of spark. i will try riding it around without plug.
     
  16. Fabian

    Fabian Well-Known Member

    If you are going to ride the bike without the spark plug, make sure that you disconnect the CDI from the magneto, otherwise there is a good chance that you could damage the CDI.

    When you disconnect the CDI from the magneto wires, make sure that the ends of the magneto wires don't come into contact with each other, otherwise there is a good chance you will damage the magneto.

    Although these engines are simple in their design, you need to think ahead and not create more problems than you are trying to solve.
     
  17. boogster

    boogster New Member

    I did all that now what should i do.
     
  18. Fabian

    Fabian Well-Known Member

    You do what i did when getting involved in this transport/hobby: you go in a corner and cry your eyes out for three days, because the damn engine won't work, no matter how much you try and fix it.

    Then after a good three days of crying your eyes out, you hit the internet and spend 3 weeks reading everything and anything about these engines. Only then do you go back to the bike and start working on it, to make a complete success of the situation.


    The other option is to do what one forum member did: throw the bike in a lake because he couldn't bear the despair of spending countless hours of his life trying to get the engine to work.
     
  19. boogster

    boogster New Member

    HAHAHAHAHA. Srsly tho any ideas on what could be wrong?
     
  20. crassius

    crassius Well-Known Member

    did you check for leaking cases, seals?
     
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