[NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm

[Bob Kane]

The list is a great way to to get ideas as to what might be wrong with the engine, but there are a lot of variables. Trying something is a good first start. Better now than the first day of the NATS.

 Bob Kane
getterflash at yahoo.com




________________________________
From: Paul Horan <paul.horan at sbcglobal.net>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Monday, February 2, 2009 7:38:28 PM
Subject: Re: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm


Ron, 
   After talking With Pete Cosky, checking out the regulator is exactly what I plan to do.  I've seen the green gunk before and cleaned it up on other engines.  Think I will do that before we take it out to the field tomorrow.
Thanks,
Paul

--- On Mon, 2/2/09, Ron Van Putte <vanputte at cox.net> wrote:

From: Ron Van Putte <vanputte at cox.net>
Subject: Re: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Monday, February 2, 2009, 5:47 PM


Before this is done, there will be recommendations to replace everything below
the plug and then put in a new plug.  <BG>

Seriously, the diaphragm could be bad or the plunger could be sticking in the
pressure regulator.   If the diaphragm looks good, it is probably OK.  If you
remove the plunger (paying attention to the orientation of the spring) and find
"green gunk" on the stem, the plunger will stick intermittently. Clean
it.

Ron

On Feb 2, 2009, at 5:32 PM, Ed White wrote:

> That's my vote, ring and probably bearings, if the engine has any
serious time on it.
> 
> Not only the ring but if the slot for the ring is also worn (the ring has
a sloppy fit in the piston slot and can move up and down visibly at all), you
may need a new piston as well.
> 
> Ed
> 
> From: Derek Koopowitz <derekkoopowitz at gmail.com>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Monday, February 2, 2009 2:19:14 PM
> Subject: Re: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500
rpm
> 
> I would suggest replacing the piston ring and perhaps even the bearings.
> 
> From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
adriancwong at earthlink.net
> Sent: Monday, February 02, 2009 12:09 PM
> To: paul.horan at sbcglobal.net; General pattern discussion
> Subject: Re: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500
rpm
> 
> What fuel are you using? Check the exhaust valve for carbon deposit and
header opening for clogging.
> 
> The surging could be uneven contact point on the valve cover. Wet sand it
lightly with 400 sand paper on smooth surface until surface shines.
> 
> Adrian
> 
> 
> -----Original Message-----
> From: Paul Horan
> Sent: Feb 2, 2009 11:18 AM
> To: General pattern discussion
> Subject: [NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm
> 
>     The problem is a YS 140 FZ that runs fine at idle and 40 to 100%
throttle but loads up around 2500 - 4500 rpm.  This is especially nasty since
that is the rpm range for a smooth takeoff,  once it goes to full throttle the
engine does not develop full power (about 40% power) and dies.   Plenty of smoke
trail so it is not going lean.
>    Another symptom is on the ground running  2500 - 4500 rpm the rpm is
not steady.
> Help,
> Paul
> NSRCA 3606
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

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