YS FZ91 Problem

[Kenneth Blackwell]

Have you checked the tank clunk line for an internal leak?

Cheers,

Ken B.

----- Original Message ----- 
From: "Ed White" <edvwhite at yahoo.com>
To: <discussion at nsrca.org>
Sent: Wednesday, January 28, 2004 11:11 PM
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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