YS 140 FZ to L Conversion Help Needed

[Terry Brox]

You will need to screw the regulater in 3/4 of a turn to lower the increased fuel pressure. I have had to do this on my conversion along with every new L. 
  ----- Original Message ----- 
  From: Ronald Filteau 
  To: discussion at nsrca.org 
  Sent: Sunday, July 11, 2004 12:07 PM
  Subject: Re: YS 140 FZ to L Conversion Help Needed


  I agree with Ed White  It sounds like a air leak.  Also what is regulator set at since you did all the changes.

  Ron
    ----- Original Message ----- 
    From: Bob Kane 
    To: discussion at nsrca.org 
    Sent: Sunday, July 11, 2004 9:24 AM
    Subject: Re: YS 140 FZ to L Conversion Help Needed


    Hmmmm . . . . . .  you have put all the right parts in and assuming the rest of the engine is sound. . . . .   my guess is an air leak. The low end needle on my conversions is usually about 3/4 turn out from closed. Did you replace the gaskets?

    Ed White <edvwhite at yahoo.com> wrote: 
      Folks,

      I need some advice. I've converted my YS 140 FZ to an
      L. New crank, crank ring, L throttle barrel and new
      throttle barrel seal. Great increase in power, but
      can't get it to idle worth a damn. I either fly with
      a very high idle or it quits in the air after its been
      at idle. On the ground I have to either set a very
      high idle (>3000 rpm) or it just looses rpm until it
      dies. In the air if it doesn't have the very high
      idle it quits after any maneuver that needs it to idle
      on a long downline. It continues to idle but quits
      when I increase throttle.

      Here are some of the particulars: OS F plug, Magnum 1
      and 1.5 fuel (acts the same with both fuels), 17-10N
      prop

      When this engine was an FZ it ran and idled
      beautifully in this same plane (same tank, same fuel
      lines, same throttle servo). Just was a little shy on
      power for the Masters sequence.

      Things I've tried:

      low speed need settings from 1 to 2 turns (lots of
      settings in between)
      new glow plug
      removed the regulator ballast
      put in a new piston ring
      drilled holes in the piston
      new diaphragm

      None of the above made any difference I could tell. 
      Have torn it down far enough to replace the piston
      ring and reassembled. Found nothing out of place.

      Aside from buy another engine, I'd appreciate any
      suggestions.

      Thanks,

      Ed



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    Bob Kane
    getterflash at yahoo.com 


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