needle clip

Discussion in 'Motorized Bicycle General Discussion' started by FileStyle, Jul 8, 2008.

  1. FileStyle

    FileStyle New Member

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    when you install the throttle into the slider barrel , should the needle clip be above or below the c - shaped washer? I have run both ways and seems to do fine either way but just looking for a census!
     
  2. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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  3. stude13

    stude13 New Member

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    very nice paul
     
  4. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    I just stole Norman's pictures.
     
  5. MarkTur

    MarkTur New Member

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    Oh...and I thought you were an upstanding individual! ;)
    (kidding)
     
  6. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Naw I'm a natural plagiarizer and general clown about town and can be found outstanding in my field. But other than that, I'm a fine and serious dude. rotfl

    Hey why re-invent the wheel?
     
  7. MarkTur

    MarkTur New Member

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    LOL :)

    Dude, help me out...I richen up my motor, and all of a sudden I can hit 35mph...but my idle is barely running with the screw turned all the way in. 35:1 AMSOil, NGK plug. The low end is HORRIBLE. I moved the clip to the third slot down from the blunt end. It was on the last slot - lean - before, and I had decent low end, but great mid, boggy high.... I know the high end now was too lean, but I guess the way I was riding it (half throttle) it was rich enough to give me a nice brown plug.

    I'm actually ready to move on to a better bike and new motor, but don't know what to buy, or who from, and who's got anything in stock. But before I do anything, I want to get my motor right.

    I ported both ports like you suggested, so that's no longer any type of bottleneck. I also have an o-ring in the carb to prevent air leaks - but I'm ready to pull it out and let some more in if nobody can give me a better suggestion. :)

    Thanks!
    Mark
     
  8. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    So have you actually ported your engine?

    Or just matched the stock exhaust to the port? Or did you get an expansion pipe?

    Same with intake? Port/gasket/manifold all match?

    Is your engine well broken in? How many full tanks of fuel have you used?

    Have your jets arrived? Have you measured your stock jet?

    I need a better baseline - because it's quite odd going two clicks rich makes it run better. Especially at WOT.
     
  9. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Sometimes the O-ring if too fat, makes it worse.
     
  10. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    I have found that when I get an optimal full throttle mixture, the bottom end is too rich. Good off idle and mid? too lean at WOT.

    I taper my needles to fix that. Not for the faint of heart.....
     
  11. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    So you chuck the needle up.....how much do you remove?

    .....what grit emery paper for how long, etc.....
     
  12. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    That's why it's not for the faint of heart....you have to take it out, use 320 paper and sand it a little at a time (chucked up in a cordless drill) then put it back and test, repeate....over and over until it's right. You can only do this if you can hear the difference. I usually take a little off until I can see it on the paper, then test.

    I get the engine set so it runs well at idle and part throttle cruise, then start tapering the taper from there.
     
  13. ran49

    ran49 New Member

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    I have done the same thing by chucking the needle in a drill press using 600 grit wet/dry to start with.What I was trying to accomplish was a uniform steeper taper by removing most of the material from the tip.I found if you remove too much from the the top of the taper(fat end)
    It may run too rich at idle at any setting.Fix= new needle.Like Bikeguy says,little at a time and mostly from the tip.Ron
     
    #13 ran49, Jul 9, 2008
    Last edited: Jul 9, 2008
  14. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    I'm gonna give it a go. I have a whole spare carb AND pocket bike clone carb on the way from BC (soon!!)
     

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