YS dies at bottom of stall turn - Help!!

[vicenterc at comcast.net]

I have a friend that had the same problem and the advice that Troy gave you is right on target.  There is a very good chance the your low end is lean.

Vicente Bortone


> Thanks Troy & Dean.
> I'm gonna try you're suggestions and report back.
> I realise you can't "tune" an engine on the internet, but the advice is
> invaluable.
> 
> Troy. I adjusted the idle by turning the idle screw out to lean it. - what
> you said makes sense and I'm gonna next go the other direction. I thought it
> was rich because the motor seems to slow down to die.
> 
> The regulator is flush with the case - actually still in the factory
> location. the only adjustment I've made to the regulator was to turn it in
> 1/2 turn, thinking maybe I was getting too much fuel. I since put it back
> (decided it wasn't a regulator problem).
> 
> I'll try to describe how the motor is running.  it never dies at idle on the
> ground and transitions great to WOT (no hesitation at all). Pull it back
> down to idle and it will possibly move around somewhat(400-500RPM) but I
> can't identify an increase or decrease in idle, it just seems to move
> around.  NOW if I increase the speed by 1 click of the throttle stick (not
> the trim)then the motor will struggle to run and possibly die. if it does
> take the throttle it sags a little before catching up. Again I'm talking
> about less than 1/4 throttle. From there on faster it runs great. I was
> interpeting this to be rich on the low end.
> 
> I'll try richeneing the bottom ( turning the low speed needle in(clockwise)
> and change the glowplug. I am still on the original glowplug.
> 
> BTW  -this motor ran so good out of the box that I didn't touch anything up
> until now.
> 
> thanks again and I'll let you know what I find out.
> Eddie
> 
> 
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of Eddie Batchelor
> Sent: Monday, June 28, 2004 10:34 AM
> To: discussion at nsrca.org
> Subject: YS dies at bottom of stall turn - Help!!
> 
> 
> Facts:  YS110 powermaster 30% Heli fuel Ys glowplug APC 15X10 turning 8800
> and idles between 1800-2000.
> Problem:
> My fairly new YS110 (about 2 gallons of fuel thru it) has started dieing at
> the end of prolonged downlines -such as coming out of a stall turn or on
> final approach.
> 
> I have done the following so far:
> 1. assumed the idle was rich - leaned it out until the motor started
> throwing the prop. Ok now it's too lean, so I richened it back up.
> 
> 2. changed the tank and fuel lines.
> 
> 3. discovered one of the in-line fuel filters partially unscrewed. tightened
> this up
> 
> 4. changed the throttle servo that appeared to have deadband around the idle
> area(apparent bad pot)
> 
> I've attempted to fly after each of these changes and the motor will die
> when I add throttle at the bottom of the stall turn. Now if I give a little
> throttle during the downline & not let the motor slow down completely it
> appears to do fine.
> 
> I want to be able to do a stall turn or a big loop and let the plane pull
> out at the bottom with the motor idling and continue flying (at idle) until
> I wish to add power.
> 
> Another example is on a landing approach when you realise you're a little
> short and try to add just a blip of power to reach the runway, it dies about
> then. (has twice now)
> 
> Does anyone see a "glaring" mistake I'm making, or have a suggestion of what
> next to look at. I realise I'm at the bottom of the learning curve with YS
> 4-c motors and it ain't no fun  :-))
> 
> Any help will be greatly appreciated.
> 
> Eddie
> 
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