YS FZ91 Problem

[Earl Vincent]

Ed, I know you said it was a club member that is interested in pattern, does
he have a computer radio and does he turn on any kind of mix or landing
switch that may have a throttle low set in it, this is not assuming he has a
four channel Conquest. Us pattern flyers are not the only pilots that have
hi end radios.
Earl Vincent
----- Original Message ----- 
From: "Ed White" <edvwhite at yahoo.com>
To: <discussion at nsrca.org>
Sent: Thursday, January 29, 2004 12:11 AM
Subject: YS FZ91 Problem


> Folks,
>
> We have a club member who is really interested in
> pattern and bought a ARF pattern plane and put a YS
> FZ91 in it to fly Sportsman and Intermediate.  The YS
> has been a problem since he bought it.  It starts
> easily and runs great on the ground, idles beautifully
> before take-off, has good power in the air and flys
> the intermediate sequence well.  Then he sets up for
> landing and on the downwind or base leg the engine
> quits.  I don't mean occasionally quits, I mean every
> stinking time.
>
> This is a very low time engine and the only time I've
> seen it land under power was when the throttle linkage
> slipped and he couldn't make it idle.  We've checked
> for pressure leaks, run the same magnum fuel I use in
> my FZ140, tried the idle leaner, tried the idle
> richer.  He sent the engine back to YS who installed
> an "updated" piston.  All to no avail.
>
> I finally got him to give me the engine to tear down
> and look at.  I haven't got very far into it, just
> pulled the valve and airbox covers and diaphragm.  I
> was sorta hoping to find an air leak but so far
> nothing obvious.  Any thoughts/experience from the
> community?
>
> Thanks,
>
> Ed
>
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