YS .91 idle setting

[Ihncheol Park]

I got confused.
regulator in = less pressure?  It is opposite to what I remember.
I never remember this correctly even after more than 8 YS 4-stroke engines.

Ihncheol
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Terry Brox
  Sent: Monday, April 07, 2003 5:20 PM
  To: discussion at nsrca.org
  Subject: Re: YS .91 idle setting


  I too was told that. However, turning down the pressure helped me. I also
turn the pressure down on my L's. I know that around 2000 RPM and below, the
pump pressure is not to be a factor, that is why they tell you to work you
idle adjustments the way they do. Set the High speed needle first, then
bring back to idle so it hits 2000 instantly. Then observe if it speeds up
immediately or slows down. If it speeds up at first then dies, it is too
lean and vice versa. Above approx. 2000, it is working off of tank pressure.
       I hope I remembered the suggestions correctly, my earlier
recommendation worked for me. You didnt say, however, if the engine sped up
at first, but you need more nitro none the less. Good luck, Terry
    ----- Original Message -----
    From: Keith Hoard
    To: discussion at nsrca.org
    Sent: Monday, April 07, 2003 6:58 PM
    Subject: Re: YS .91 idle setting


    I've got 15% cool power (green), guess I need to get some fuel with more
"oomph".  I'm going out to mess with it tomorrow and will try the regulator.

    I was looking on the YS engine forum on RC Universe and Dave Shadel
stated that the regulator doesn't have any influence on the top or bottom of
the RPM range, only the mid-range.  Can anyone else here confirm that??


    Keith L. Hoard
    Cordova, TN
    klhoard at midsouth.rr.com
      ----- Original Message -----
      From: Terry Brox
      To: discussion at nsrca.org
      Sent: Monday, April 07, 2003 6:50 PM
      Subject: Re: YS .91 idle setting


      You might try turning the regulator in. To get my 91AC to idle, I had
to turn the regulator in nearly 3/4 of a turn and idle out 1 1/2 turns. Ran
great after that. What nitro are you running? You need a minimum 20%, and
30% is better yet.
        ----- Original Message -----
        From: Keith Hoard
        To: discussion at nsrca.org
        Sent: Monday, April 07, 2003 5:12 PM
        Subject: Re: YS .91 idle setting


        Yup, got that. . . left is lean, right is rich. . . Just came in
from messing with the low speed needle and it is set good for the
transition, but it still won't idle for more than 20-30 seconds.  I run it
full throttle for about 10 seconds to pressurize the tank then drop it to
idle - 2000 to 2400 RPM.  The engine idles at this speed for about 20-30
seconds then the RPM slowly decays until it quits, then fuel drips out of
the carb (engine inverted).  I relight the glow plug, spin the engine and it
starts right up again and repeats.



        Keith L. Hoard
        Cordova, TN
        klhoard at midsouth.rr.com
          ----- Original Message -----
          From: Terry Brox
          To: discussion at nsrca.org
          Sent: Monday, April 07, 2003 5:03 PM
          Subject: Re: YS .91 idle setting


          Low speed is an airbleed. Out is leaner, in is richer. Opposite
from the high speed.
            ----- Original Message -----
            From: Keith Hoard
            To: NSRCA Mailing List
            Sent: Monday, April 07, 2003 4:51 PM
            Subject: Fw: YS .91 idle setting



            From: Keith Hoard
            To: NSRCA Mailing List
            Sent: Monday, April 07, 2003 3:06 PM
            Subject: YS .91 idle setting


            Gentlemen,

               I'm breaking in my YS .91FZ and seem to have gotten the top
end working fine, but the engine idles at 2000 RPM for about 10 seconds then
slowly dies.  I don't remember which way to turn the low speed needle, and
the YS Performance page seems to have been hijacked.  Thanks!!




            Keith L. Hoard
            Cordova, TN
            klhoard at midsouth.rr.com
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