YS 140FZ Help

[GW]

On my 140 FZ Sport  the setting that I have are:

Highspeed Needle: 1 1/2 turns open
Low Speed:  3 turns open (still rich, but not off to much)

As I understand it, the Diaphragm gets more pressure on the seat by rotating
the regulator in, hence taking more pressure to inset fuel. By rotating the
reg in, you decrease fuel flow( higher resistance to fuel entering reg)  at
a given low speed rpm. Some say it has little to do with idle below
2000,when I rotated mine in, it did improve the idle somewhat. I set mine up
at high idle of 2100. Low idle for landing is set to 1800.
I think the regulator has alot more to do with transition than anything
else. When out of the box, the FZ was poor in transition, the 1/2 turn in
made this much better.

I plan on opening my airbleed some more today to get the idle closer to
optimum. Its still a bit rich on idle.

My DZ was not near as critical as the FZ is proving to be. I think the DZ is
still very close to factory settings.

As a sidenote, my FZ continued to get better and better in idle and power as
I got more gallons through it.







GW
Gerald Williams
Email : gw at gwair.com
Webpage: www.gwair.com

Support Tony Stillman District 5 VP
http://webpages.charter.net/nneville/nneville/



----- Original Message -----
From: "Ron Sonderegger" <ronsond at erols.com>
To: "NSRCA-Discussion List" <discussion at nsrca.org>
Sent: Wednesday, September 03, 2003 6:38 AM
Subject: YS 140FZ Help


> I am in the process of breaking in and tweaking a new YS140FZ.  I'm
> replacing an old YS120NC in a Prophecy that I never got to idle
> properly.  I am using Wildcat YS 20 20 fuel and an OS-F glow plug.  The
> instructions say start the high speed at 2 and 1/2 turns open and the
> low speed 1 and 1/2 turns open.  By the way the 140FZ has a very
> different high speed needle compared to my old 120NC.  At those settings
> I'm getting good open throttle power but the idle is way to rich.  We
> opened the low speed needle/air bleed all the way to 2 and 1/2 turns out
> and the engine appears to be still rich on idle. The low speed
> needle/air bleed does not appear to have much effect.  I also turned the
> regulator screw in 1/4 turn attempting to get a better idle.  I've only
> run a tank through this 140FZ so far.  Can some one with first hand
> experience tell me what their settings are on a 140FZ.  -------- Ron
>
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