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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS 56 SR problem
01-17-2010 07:05 AM  8 years agoPost 1
Parsifal

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Singapore

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Hi all,

I just installed a 56 in a new SDX and have been unable to tune it to run right on CP30%. It was broken in rich for about 6 flights and then progressively leaned out on both the high and middle needles.

At anything less that 2 turns on the main needle, it wavers between being rich and cold and lean and hot, the middle needle has been between 2 and 1 turn open, with no discernable difference in consistency.

Inconsistency is felt within each flight with the engine switching from rich to lean randomly through the tank.

I have checked all the usual suspects in terms of plumbing and the pipe is a Hatori 566 which i thought would be ideal.

Anyone having similar issues?

Thanks.

Regards

Pars

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01-17-2010 09:29 AM  8 years agoPost 2
baby_zyklon

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Singapore

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Check the diaphragm and one way check valve. Make sure they are not sticking, torn or dirty.

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01-17-2010 10:49 AM  8 years agoPost 3
Parsifal

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Singapore

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thanks, those were the first things i did. No issue there. Unusually, using the factory recommended settings results in an extremely lean running engine. What is everyone else using?

Pars

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01-17-2010 12:48 PM  8 years agoPost 4
barely can fly

rrApprentice

oxford ga. usa

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We just had a ys91 here that would not tune right, either to rich or to lean and inconsistant, owner was getting ready to send in for warranty and as he was removing the engine he noticed that the rubber sealing washer that seals the carb was not there.

Took one off of older spare motor and now the new engine runs flawlessly.

Don't know if this will help or not, i don't know if the 56 is sealed the same way.

Edit- also the check vavle was put together backwards from the factory.

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01-17-2010 12:51 PM  8 years agoPost 5
barely can fly

rrApprentice

oxford ga. usa

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This 91 was acting exactly like your 56, exact same symptoms.

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01-17-2010 01:13 PM  8 years agoPost 6
SC Raptorman

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South Carolina

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I'm having the same issues with my new YS56SR , I can not find the sweet spot on any setting , mine really acts up when you load it trying to do tic tock or something like that . I have set it up by the book and leaned from there but no help . I know what a from tuning other motors from the sound when you get them right . Hopefully someone will chime in on what to look for .

Oh what a feeling 3D Flying can be
Magnum Fuels

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01-17-2010 01:30 PM  8 years agoPost 7
Parsifal

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Singapore

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Yep, it usually acts up under load. Odd. The best i could get it to run was about 1.25 open on the mid needle and about 1.75 on the main, this results in the longest relatively rich running setup with intermittant leaning out. Power is nothing to write home about.

The backplate with this setting stays cold to the touch, Cold... then it switches to very hot in a split second. Its really strange.

With both open 2 turns, its slobbering rich, with the mid at 2 and the main at 1.5, it is crazy lean, i could go on but you probably get the idea.

As for the sound, it sounds rough, most certainly not what a properly running engine would sound like.

Alas.

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01-17-2010 01:42 PM  8 years agoPost 8
SC Raptorman

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South Carolina

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Yep you are have the same issue I'm having to a tee. Sounds like a broke record , surely someone will come to the rescue.

Oh what a feeling 3D Flying can be
Magnum Fuels

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01-17-2010 02:50 PM  8 years agoPost 9
barely can fly

rrApprentice

oxford ga. usa

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Read the post above yours, don't know if it will help, but had the same symptoms.

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01-17-2010 03:02 PM  8 years agoPost 10
SC Raptorman

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South Carolina

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I believe I found my problem as Fury3 was very helpful as I had my needles backard as to trying to set them , the one with the clicker is mid and I thought it was high so that was my problem I hope . I was setting the setting backwards as the pic of the motor was misleading . This might be what you did also Alas , check and see.

Oh what a feeling 3D Flying can be
Magnum Fuels

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01-17-2010 04:37 PM  8 years agoPost 11
Parsifal

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Singapore

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Ahahahahahahahha!!! oh my god! I am man enough to admit being a dumbass... i have been working the needles the wrong way around all this weekend! , will have to try again next weekend!. THis will teach me to pay closer attention to the instructions!

Thanks all... i will just slink away in embarrasment for the moment.

Thanks alot.

REgards,

Pars

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01-18-2010 05:27 AM  8 years agoPost 12
Paul Woodcock

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Dubai - United Arab Emirates

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Hi Parsifal

All is forgiven.......

I also had this rich/lean issue. BUT only during break in. It would go from running a little rich and making good power to WAY rich if i landed for a few seconds and left the heli idling while making Tx adjustments. This happened at around the 10th flight where i was starting to lean the motor out.

It just went away by itself. I may have been to quick to start leaning or it was cooling too much while sitting on the ground or something....

I also don't land to adjust the Tx..... so it may still be there????

Regards
Paul

PS: the main needle is VERY sensitive. 1/16th of a turn is ALOT when you are close...... the main needle needs the screw driver..... just to rub it in.

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01-18-2010 07:26 AM  8 years agoPost 13
Parsifal

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Singapore

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Well, i'll keep trying as i was at the close of the weekend running 1.75 turns on the mid and about 1.25 on the main, will have to play around with it till i get there i suppose. Will keep trying and report back if it continues. Thanks again.

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01-18-2010 11:50 AM  8 years agoPost 14
SC Raptorman

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South Carolina

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Update , 2 more tanks and have the hs on 1 1/4 and mid on 1 3/4 just like you Parsifal and mine is doing real good as I know Im real close now. Im still alittle consevative so as time goes by it will run better as I get used to tuning a YS . Its amazing what happens when you get the right needles tuned in .

Oh what a feeling 3D Flying can be
Magnum Fuels

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01-18-2010 03:33 PM  8 years agoPost 15
DS 8717

rrProfessor

Here wishing i was somewhere else

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If you change the mid range setting you have to readjust the high end to compensate for the change.If you lean the mid needle you have to richen the high needle or it will be too lean..

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-18-2010 06:13 PM  8 years agoPost 16
SC Raptorman

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South Carolina

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If you change the mid range setting you have to readjust the high end to compensate for the change.If you lean the mid needle you have to richen the high needle or it will be too lean..
So do you do opposite when you richen mid you lean hs ? So you have to balance each if you move one or the other. Is that what you are saying ?

Oh what a feeling 3D Flying can be
Magnum Fuels

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01-18-2010 06:36 PM  8 years agoPost 17
Bogdan

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Netherlands

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Parsifal,

if you experience sudden transitions to lean it can be that your glow plug will be destroyed. That can result in unwanted autorotation.
In my opinion you should find the solution on the bench or in autorotation safe conditions.

my 2 cents,
Bogdan

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01-18-2010 08:06 PM  8 years agoPost 18
Pulento

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CHILE

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So do you do opposite when you richen mid you lean hs ? So you to balance each if you move one or the other. Is that what you are saying ?
Yes.

My YS56SR is trickier to tune and I think mainly because the staring needles are really close to final settings and the mid needle bleeds the top end. So is really easy to get with a good mid range and lean top end.

I noted this after I started to overheat and sag on sustained tic-tocs

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01-18-2010 08:41 PM  8 years agoPost 19
Smok

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Antwerp, Belgium

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For what I am seeing with YS heli and airplane engines, they do not
need to be "leaned out" and I found that such leaned-out setting
can cause heating problems ( esp in heli motors ), occasional
tail kicking ( that can also be caused by a too hot glow plug )
and in effect a less stable run with effectively less power.

On top of that, Hatori 566 is a tuned muffler, so if anything,
then it might need to open the high needle by 30-90 degrees.
So getting the engine to run more lean does not always
produce more power ( which is eventually true with low-nitro fuel ).

Especially with CP30 - if the mixture is richer, the motor gets
more fuel to burn but also more oxygen (from the nitro)
so I found the power vs. mixture curve to be very close to flat
around the recommended mixture setting. Also CP30 produces
lots of smoke and it's not indicating a problem with mixture.
That "leave it set close to factory settings" approach
works for me very well and produces lots of power and smooth,
stable run.

I found the approach to lean-out to the (reasonable) maximum
is still giving more problems than benefits, some people
fight the heating issues with CarbSmart and the likes,
but IMHO a very simple and working approach is just to set
the needles by the book and forget it.

Of course there might be some regulator issue too ( sticky
silicone valve etc. but you might need to give it some time
to properly set. Also I do not use any after-run oil,
just run the motor with a starter and glow battery connected
but fuel tube disconnected, until it does not want to start
anymore. I found that a thick after-run or a fuel with castor
or high viscosity oil can cause a similar issue too.

With the moderately rich mixture, YS motors run very well
with Enya #3, while a leaned out Hyper would rather need #4 or #5.

Anyway, now it's mostly armchair RC here, weather does not cooperate ;-)

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01-19-2010 01:06 AM  8 years agoPost 20
CoronaL

rrKey Veteran

Winnebago IL

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on YS the "main" needle you tune is the MID, NOT the high.

Tune the mid until you get good all around flying and power. THEN tune the high just a bit to get the response you want for sustained power moves, ie sustained tic tocs, climbouts, etc...

Don't mess with the idle much as it should be very close at factory, just bump the idle speed up a bit via servo trim/subtrim to get it running good at idle.

Mid tuning effects pretty much the whole power band. Even a bit of the high. If you goober that up, you will toast the motor pretty quick.

Randy!!! I am the liquor

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › YS 56 SR problem
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