strange loss of power down hill

Discussion in 'Motorized Bicycle General Discussion' started by WildAlaskan, Oct 2, 2010.

  1. WildAlaskan

    WildAlaskan New Member

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    so first off im running a 66 cc i bought off zoombicycle in the spring it performed well and im satisfied with it aside from the many many bugs i eventually worked out to many to even remember them all

    but any way to the piont there is a hill a few miles away from my house and by the time i get to it my engine is warmed up so when i go down it at full throttle witch i normally dont do but to see how fast i can go i tried it twice in the last week and both times i made it down about 2/3rds of the way down then my bike slowed down
    it almost felt like i was trying to use my motor to slow down like when engine braking but i was full throttle but probably only goin 30 or so the engine runs good and idles great but i dont seem to have the top end mostly just mid and high mid well medium high mid if that makes sense

    ANY HELP AND ADVICE WOULD BE NICE oh and it is completly stock except for a poo poo pipe i didnt know about port matching when o got it although i did smooth the exaust manifold just didnt enlarge it i guess out of instinct or something i dont know i just felt like it should have been smoother the thought that making it larger never really crossed my mind
     
  2. Mind_Reader7

    Mind_Reader7 New Member

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    You really should pull the clutch when you go down hill.

    Anyhow, I think it would be bcause the float in the carburator would be on an angle, causing it to block off a lot of the fuel supply.
     
  3. WildAlaskan

    WildAlaskan New Member

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    yes i know i should pull the clutch in but i felt compelled to see the top end out of this hill and after the bogg down i felt like trying it again


    i dont think its the carb angle the hill is not super steep its just a long hill
     
  4. Mac

    Mac New Member

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    Could be running out if gas?? It could be 4 stroking as many do unloaded, suggest a good billet intake, shorter and makes a huge difference, also a tuned pipe, gotta let these things breath, aftermarket air filter?? Other than throwing parts at it, enjoy the reliability in stock form, once ya port match, clean up, new plug, intake and pipe... Your gonna need better mount bolts! On a positive note, you may be suprize'd how high you RPM is screaming down a hill, may not seem high cause your diggin the ride, but I bet it's all the stock motor can do.

    Mac

    Rid I say "reliability"... WHAT was I thinking.
     
    #4 Mac, Oct 2, 2010
    Last edited: Oct 2, 2010
  5. WildAlaskan

    WildAlaskan New Member

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    it had plenty of fuel in the tank
    the tuned pipe and billet intake sound great im gonna install them on my next build also with some moderate porting and hopefull thinking here but a crank truing and balenc
     
  6. msrfan

    msrfan Well-Known Member

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    Sounds like you topped out. The cheap mag or control could be crapping out at high rpms also.
     
  7. WildAlaskan

    WildAlaskan New Member

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    cheap mag huh maybe what do you man by control o assume cdi

    also i am impressed with how well balenced the stock cramk is from what ive heard from others about the vibration they are getting but maybe thats cause im not getting the rpms they are but at to speed the vibration is thruoghout the bike but not to bad
     

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