30 second setup for the YS 140DZ

[PENNISI Peter]

Don,
 
Quick question about your pump position. You said 3/4 turn past flush. Is
that "IN" past flush or "OUT" past flush.
 
Good article
 
Regards,
 
Peter

-----Original Message-----
From: don szczur [mailto:dszczur at maranatha.net]
Sent: Saturday, 5 April 2003 1:48 PM
To: discussion at nsrca.org
Subject: 30 second setup for the YS 140DZ


Thought I'd offer some quick set-up tips for anyone interested.  If you have
an excellent system that works for you, no need to read on.  For those
remaining:
 
1. Use a good hot glow igniter.  The fuel injection cools the plug more than
conventional induction engines.  You'll know if you hear the engine pop,
then no fire at all while spinning the prop and running the starter battery
(as the engine floods).
 
2.  Set up fuel line/filter so its external about 2 inches (the holder can
reach over and pinch line if engine gets flooded while starting)  Also the
filter external is easy for maintenance and diagnostics (those tiny bubbes
from a faulty fuel line).
 
3.  Start engine.  Should start easily with a high torque starter.  Start
with needle out quite a bit, pump setting varies.  (I have heard the
recommendation of just a little recessed; almost flush with screw housings,
or, start with factory setting).
 
4.  If engine does not idle (loads up an quits after 10 seconds) screw the
pump out.  Mine took quite a bit out- about 3/4 turn out from being flush
with pump screw housing.
 
5. With needle rich (I put mine out 2 1/2 turns)  run full throttle, then
reduce back to idle, screw in a quarter turn, run full throttle (you should
hear an rpm increase). Keep doing this process til you year that increase,
go another 1/4 turn until it does not increase or starts to knock. Then back
off an eight to quarter turn.  Note- during each run-up, I'm not running at
full throttle for more than about 3 seconds.  Why?  So the engine does not
over-heat if going in too far.
 
6 Fly.  Great idle on the ground and excellent runs.
 
For reference, here are my settings.  Fly JR,  Don
 
Engine: YS 140DZ
Prop: APC 16x12 (keeps prop noise down)
Pipe; ES- XL (2C pipe)  Less expensive and quiet
Fuel:  Magnum Heli Pro
Glow Plug: OS F
Filter:  YS 
Tank:  Tetra 18 oz w/bladder
Needle- about 1 5/8 out.
Pump- about 3/4 turn past flush.
 
Discussion:  The pump (turning it out) makes it pump with less pressure,
thus the need to screw out the needle.  The less pressure also results in
leaner idle.  Likewise, turning the pump screw in makes the pump (pump
more).  Turn it in too much and the fuel line pops off at the injector!  No
need for this much pressure.  
 
Note on bladder-  first one broke after 10 gallons.  Second one is still
going. I now fill tank as normal, but as its getting to the top, pump very
slowly so the (balloon) is not too stessed.  Fuel should dribble out,
interspersed with bubbles.
 
Good flying, Don
 
 



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