[NSRCA-discussion] YS 140DZ tuning question

[jivey61 at bellsouth.net]

Bob
 It sounds rich to me and is putting out the plug when you throttle back.
The needle should be 1 to 1.5 turns out the engine should be turning
84-8500. There is a flat spot with the needle adjustment between too rich
and too lean that almost nothing happens.Tune towards closed needle for
HS.The engine will give the hammer sound( detonation )when it is too rich or
too lean.The low side pump should be flush.When set properly it will idle
without loading up and quitting. Check the idle first. then set the hi end.
Hope this helps.

Jim Ivey
----- Original Message ----- 
From: "Bob Kane" <getterflash at yahoo.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Monday, May 01, 2006 1:50 PM
Subject: [NSRCA-discussion] YS 140DZ tuning question


> You may have seen my previous post about replacement
> landing gear for my Temptation which were broken by a
> "landing" in a farmers field after an untimely
> deadstick.
>
> I could use some DZ tuning guidance. I'm pretty good
> at setting up the FZ/L series, but this experience
> does not help much with the DZ.  The deadstick occured
> on a downline after testing the vertical performance.
> I pulled the plane vertical and rolled on the throtle,
> it rocketed straight up. Satisfied with the ample
> vertical performance, I rolled the throttle back and
> did a sloppy wingover to get the plane pointed back
> down. I pulled back to horizontal and rolled the
> throtle up to about 1/2 and watched in shock as the
> prop slowed and stopped. You know the rest of this
> story.
>
> Is this a symptom of too rich, too lean, bad plug or?
> The needle was open 1 5/8 turns, which seemd to be
> good on the ground. I was running PowerMaster 20% DZ
> blend, Mejzlik 16X12 prop, OS F plug. The tank is on
> the CG, YS foam clunk, no header tank. The vent line
> has a check valve to keep fuel from leaking out.  My
> plan right now is to bench run the engine to see if I
> can figure out the needle sweet spot, but I know
> performance in the air can vary. Any help is
> appreciated.
>
> Bob Kane
> getterflash at yahoo.com
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion