YS 140 FZ to L Conversion Help Needed

[Ronald Filteau]

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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