80cc Mystery

Discussion in 'Motorized Bicycle General Discussion' started by MrLarkins, Jun 17, 2008.

  1. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Looks like your base gasket was leaking and it ran lean. How long have you had it? Talked to the seller (warranty) yet?
     
  2. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    BTW the squeek is in the drive area and has nothing to do with your other problems.
     
  3. MrLarkins

    MrLarkins HS Math Teacher

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    lean, i keep hearing those kind of words...lean means too much (oil, gas, fuel, air) PICK ONE please.
     
  4. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Traditionally when someone is talking about an engine and says "lean" they mean less fuel in the air+fuel mixture. So naturally this means more air.

    Lean oil in a 2 stroke premix means a light oil in the mix, less oil per quantity of fuel. (Confusingly enough, when oil is mixed heavy in the gas, it can mean a lean air+fuel burn situation)

    So anyways, yes see my Saber special.

    Lastly - what exactly is the problem now?
     
  5. regleo

    regleo New Member

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  6. MrLarkins

    MrLarkins HS Math Teacher

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    problem recap...

    0 to 20 mph runs smooth as butter
    20 to 30 mph not possible (it use to get up to 36mph, but not anymore).
    20+ it gets more gas (hence the black, oily spark plug), but the motor won't accelerate past 20mph. It gets the shimminy shakes and acts like its flooded.
     
  7. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    So - you have tried the top slot for the little e-clip on the needle?
     
  8. MrLarkins

    MrLarkins HS Math Teacher

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    no, someone told me to move it down 1...so i did, then i went down 2...when i get home (at work now, goofin off :p) I move it up and post back
     
  9. MrLarkins

    MrLarkins HS Math Teacher

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    here's the guy MISTERIGHT2_99!!!
     
    #29 MrLarkins, Jun 23, 2008
    Last edited: Jun 23, 2008
  10. misteright1_99

    misteright1_99 New Member

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    Read the first paragraph one more time CAREFULLY!!!!!!!
     
  11. MrLarkins

    MrLarkins HS Math Teacher

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    hmm, i read it 3 times, and I still read the same thing...
    it still says move down 1 slot, as I did...pablo says move to top spot (up, not down)

    what am i missing? now i'm really confused. heck, i'll just try all slots!
     
  12. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Previously you wrote:
    So....based on this I THINK you need to be more fuel lean.....moving the e-clip up makes it more lean mid throttle by keeping the needle lower in the carb jet path.

    What Norm says is correct.
     
  13. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Also - what the other guys are saying (and I'm not necessarily disagreeing with them) - based on the initial plug pictures, it looks a bit lean. But your engine is back together and we have moved beyond that, right?

    Seems to me you should try the top notch or the second notch and go from there. It's gonna turn out that your issue has nothing to do with the needle groove.

    Where did you get your new gaskets?
     
  14. MrLarkins

    MrLarkins HS Math Teacher

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    ok, i am such a noob...you guys are a bunch of help! top notch it is

    and just for the record, the wording lends itself to be confusing...i mean really...
    i'm getting it now, but thats confusing...more fuel...lean? how bout, more air or less fuel
     
    #34 MrLarkins, Jun 23, 2008
    Last edited: Jun 23, 2008
  15. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    That's just bad word choice on my part (sorry), but I meant what I said....IOW - more leaner, or just leaner…….less fuel = more leaner=more fuel lean….crazy asss English langauge…

    Properly, moving the clip to the top, without changing other parameters will result in less fuel in the air/fuel mix.:p:eek:;)
     
  16. MrLarkins

    MrLarkins HS Math Teacher

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    i moved it to the top...no effect on problem

    i don't need to be moving to have the problem occur. standing still with clutch engaged, i can turn the throttle and at some point, the motor starts acting up...maybe I can get a video of it soon
     
  17. MrLarkins

    MrLarkins HS Math Teacher

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  18. Ghost0

    Ghost0 New Member

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    Sounds like it is starving for fuel and since you moved your clip up and down the needle and that didn't work here are a couple of things to try.

    Float level too low causing fuel starvation at above idle condition

    Plugged fuel filter either in tank or auxiliary if you have one.

    Clogged jet in carb.

    Clogged float needle in carb.
     
  19. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    OK I agree with Ghost0 (imagine that) it sounds like fuel delivery is impeded - I wonder now maybe the taper of the needle is funky. Do all the easy stuff first...make sure fuel is flowing well.

    Oh yeah - thanks for the video - it really helps with the troubleshooting.
     
  20. MrLarkins

    MrLarkins HS Math Teacher

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    float level is at its maximum

    fuel filter queen

    jet in carb is clean

    float needle in carb is clean

    QUESTION:
    is it possible that a misbalance on the inside might cause a rpm threshold?
     

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