YS 140L Help (Solved)

[Michael H Lance]

Yep, I've had three break over the years.  Now keep several sets in the
toolbox and swap them out every year as insurance.  Have never been able
to come up with a reason for the failure.  Don't see the signs of wear
due to lack of oil that others report.

I also keep a set of pushrods in the box as well since one of the
failures resulted in a bent rod.

Mike
D8

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of jed241 at msn.com
Sent: Thursday, July 31, 2003 5:58 PM
To: discussion at nsrca.org
Subject: Re: YS 140L Help (Solved)

Good News...Found the problem...

Bad News...Unless someone has parts and can bring them to the Lenox
Contest, 
I will not be flying the Focus and must live with the Aresti 40 once
more...

The problem was the E-Clip that holds the rocker arms on the shaft. The 
exhaust side broke in about three pieces. One piece was jammed into the 
valve cover holding the exhaust valve open...Walla, no compression.
Engine 
quit. Had compression as soon as I took the valve cover off. Took me a
1/2 
hour to find all the pieces. Piston and everything else looks good.

Part needed is YS0580, E-Clip Set. I will buy them off of anyone that
can 
bring it to the D4 Lenox contest. If not, There is a hobby shop about
1-1/2 
hours away...In the wrong direction for the contest...

Has anybody else had this happen, or am I the only one with a gremlin 
disassembling the engine from the inside?

See ya,

Larry Diamond


----- Original Message ----- 
From: "Atwood, Mark" <atwoodm at paragon-inc.com>
To: <discussion at nsrca.org>
Sent: Thursday, July 31, 2003 8:40 AM
Subject: RE: YS 140L Help


I don't think the low nitro would cause a "sudden" change or cause the 
engine to quit as you say it did, but I agree with Eric that the YS's
enjoy 
Nitro.

Another thing to check if you've only run 10 flights is the valves.
I've 
had new or rebuilt engines where the valves have tightened up after the 
first few flights and it caused sudden failure.  I like to set the 
clearences on the tight side, but if they're tooooo tight, bad things
happen 
:)


-----Original Message-----
From: Henderson,Eric [mailto:Eric.Henderson at gartner.com]
Sent: Thu 7/31/2003 9:11 AM
To: discussion at nsrca.org
Cc:
Subject: RE: YS 140L Help

I would not run an L with less than 20%.

regards,

Eric.
-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On 
Behalf Of jim ivey
Sent: Wednesday, July 30, 2003 11:07 PM
To: discussion
Subject: Re: YS 140L Help


Larry
 Make sure the clunk is not in the front of the tank. It is not Folded 
backwards. Check the plug and make sure low end idle is set correct.
Also 
maybe lean it some more so that the top end won't be so loaded with fuel

that it puts plug out when you pull it back to idle. Sometimes My 140's
will 
quit if I jerk them back to idle, if the are too rich on top end. I know

guys my low end may not be right either.

just tho'ts
Jim Ivey

----- Original Message -----
From: jed241 at msn.com
Sent: Wednesday, July 30, 2003 10:52 PM
To: NSRCA
Subject: YS 140L Help

I have a 140L in a Focus. Has been flying very well and very strong,
with 
never a problem. I have about 10 flights on this barely used engine and
I 
flame out in a very uncomfortable attitude. Vertical climb flamed out at

about 25% of the vertical in a stall turn. I was settled at 3/4
throttle, 
never need full throttle flying Sportsman with this plane.

Although at the down wind part of the field and pointed the wrong
direction 
when the engine quit (straight up), I was able to drag her all the way
in 
and still managed to make it a very hot landing <vbg>.

Anyway, What kind of things would cause a very strong running motor to
just 
quit? If anything it was a tad bit to the rich side with a exhaust
trail.

Fuel is WildCat 15% Nitro 18% Synth (no castor).

Pretty vague question I know, just curious what this typically ends up 
being. I was planning on taking it to a contest this weekend.

See ya,

Larry
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