<DIV>The first time I ever flew from pavement was at the Com Air contest. I was flying sportsman with my ultra reliable YS61 AR. First flight, take off, trim pass, not so much as a burp. Pull up for stall turn, rudder over, downline. I pull out, advance the throttle, nothing, land dead stick. I checked all the usual suspects, pressure good, check valve good, install new Enya #4 plug and crank her up. Idles fine, transitions great, time to try again. Second round, exactly the same problem. Getting frustrated, more thourough check between rounds, all plumbing changed, restarted the engine. Idles nose up, nose down, sideways, inverted (which is now upright). Will idle forever and snap transition. Round three very optomistic. Take off alls well, stall turn and hold a little power just to be sure, comes back to life with no problems. Feeling good, next down line back off the throttle, pull out, nothing. After a full wasted day of flying and trying
everything I could think of, Margretta said, it sounds like you are cutting it off at the bottom. Light comes on, I had the stinking idle set very low to keep it from rolling away on the pavement before take off. It would idle forever on the ground, but when it unloaded in the air it was too low. It could've even been a combination of too soft a motor mount with no nose ring, low idle and a crappy throttle servo. </DIV>
<DIV> </DIV>
<DIV>Moral of the story:</DIV>
<DIV>Check the simple stuff first, perhaps your trim is just too low. If that is the case, it will always run great on the bench. Please let us know what the problem was when you get it worked out. <BR><BR><B><I>Bill Glaze <billglaze@triad.rr.com></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">He stated that it's been back to Richard already; they haven't fixed the problem.<BR>Have they run the engine on a test stand? Sometimes that can be very instructive. I know that the engine works well on the ground, only problem being at idle for landing. How does it take prolonged idle in the air if landing isn't intended? Frequently, the longest period of time the engine is at idle, is in the landing setup and landing pattern. What kind of RPM's is the engine set for at idle?<BR><BR>Bill Glaze<BR><BR>Troy Newman wrote:<BR>
<BLOCKQUOTE cite=midBAY4-DAV1515unJop4l0005f72a@hotmail.com type="cite"><PRE wrap="">If its a new motor send to YS Performance. Richard and crew will fix it up
right as rain....it will only cost you the $5 for shipping to him.
Especially if its a warranty thing.
TN
----- Original Message -----
From: "Ed White" <A class=moz-txt-link-rfc2396E href="mailto:edvwhite@yahoo.com"><edvwhite@yahoo.com></A>
To: <A class=moz-txt-link-rfc2396E href="mailto:discussion@nsrca.org"><discussion@nsrca.org></A>
Sent: Wednesday, January 28, 2004 10:11 PM
Subject: YS FZ91 Problem
</PRE>
<BLOCKQUOTE type="cite"><PRE wrap="">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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