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YS 140L inverted

Old 08-08-2008, 07:43 AM
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JIMMYMUGUREL
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Default YS 140L inverted

hello

I have a second hand YS 140L have no ideea how much have worked, but seems all parts are phisicaly OK...
I mounted it inverted on a Fun Pitts Bipe.

25% nitro + 20% synthetic oil
OS max F plug
18x6 g-sonic 2blade prop
no exhaust improvements
on max throtle around 9000rpm

My question:

is a normal thing to fall fuel drops from the air intake ( probably ) when the throtle is opened suddenly from idle to max?

When idling arround 2000rpm, no drops falling.
On max throtle also no fuel lost.
Seeems ( for me ) not to be rich or lean mix.


Please excuse my english ....

Thanks

JIMMY
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Old 08-08-2008, 08:13 AM
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petec
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Default RE: YS 140L inverted

I can say that I have ever noticed fuel drops form the intake while opening it from idle to wide open while it was running. I might get few drops out of it when set to idle and not running.

Is it just a drop or two?

Is the engine giving any indication of something not being right? Is it loading up in the mid-range at all?
Old 08-08-2008, 08:48 AM
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Default RE: YS 140L inverted

Hi Petec

The engine is new for me so I try to get used to it.
Have done a couple of flights with and for me seems to go well.
On ground ,when the throtle is opened from idle, more drops fall from the airintake.
I have noticed that just close to idle position, increasing the rpm, no drops fall.

Compared with the 2strokes glow ( 10ccm and 18ccm ) that I own still now ,the Yamada is a monster.
I can't tell if it goes on full capacity or not.

Seems to work ok on the entire range of rpm's

The only thing that alarmed me, are the fuel drops.
Maybe is beacose the engine is inverted and so the fuel what remain in carb drops?

Regards
JIMMY
Old 08-08-2008, 11:01 AM
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Default RE: YS 140L inverted

Good looking plane, except you need some color on it!

You really shouldn't have fuel dripping even on an inverted engine. Your idle/low end sounds a little rich. Most likely it's the regulator, not the idle screw setting. I'd recommend leaning the regulator setting just a little, maybe 1/8th or less at a time. Turn it clock-wise just a shade a see what happens. Give the engine several seconds after you change it to see if it has any effect. If the engine is running well in every other way, don't change the regulator setting very much.

If adjusting the regulator slightly doesn't help, then try leaning the idle setting by turning the idle screw out, CCW, a little. Remember that the idle screw is an air-bleed type, not a needle valve, so it works opposite from a regular needle valve. Turning it out leans the engine, turning it in richens it.

Hope this helps!

David
Old 08-09-2008, 07:46 PM
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Default RE: YS 140L inverted

So it is not loading up in the mid range and you only have one or two fuel drops while it is running and only when going from idle to full throttle? What happens if you set it at 4000RPM and let it stay there for a minute?
Old 08-10-2008, 11:20 AM
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Default RE: YS 140L inverted

Hello David!

Colour ... ha ha ha ,maybe a cowl.

Thank you for your advice.

I think you're right about the rich mix on iddle( this was my opinion too ) but , you know ... it's a new engine for me and after what I heard ... is a triky on settings.I was affraid to move the screws from their initial positions, before to hear some expert's opinion.

Probably the regulator opens too soon ,over-riching the iddle mix.

On the next field outgoing, will do some regulator settings.

Thank's again!

JIMMY
Old 08-10-2008, 11:40 AM
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Default RE: YS 140L inverted

Hello Petec

The fuel drops only when the engine is on iddle arround 2000rpm, but seems to be more drops when is accelerated to full.
Probably when is accelerated,the fuel for the iddle is over riched by the regulator.As I understand, the iddle fuel is "sucked" and over +2000rpm is "injected".

Not having a rpm checker on the field, but on higher rpm's not noticed fuel drops.

Thank's fot reply.

JIMMY
Old 08-10-2008, 12:08 PM
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Default RE: YS 140L inverted

I think the regulator is too rich. The reason why it is not running poorly at that setting is because with the engine inverted, the excess fuel is dripping out rather than being ingested into the air flow. If the engine were upright, that excess fuel would be entering the engine and causing it to overload. I would continue to lean the regulator a little at a time until the dripping stops. Remember to reset the the high end needle each time. If this doesn't stop the dripping, there is likely something foreign in the regulator.

Blessings, Terry
Old 08-10-2008, 06:01 PM
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Default RE: YS 140L inverted

Jimmy,

I have to agree that the regulator is just a bit rich. Adjust it in no more than 1/8 turn steps. Clockwise rotation will lean the regulator. The way to test it is here:

http://www.julton.net/Fact%20Sheet%20YS%20Engines.html

or here:

http://www.patternflyer.com/troy/?page_id=13
Old 08-11-2008, 02:08 AM
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Default RE: YS 140L inverted

Hello Terry

Thank you for advice.
Today have opened the regulator to see if is something ( dirt or other ) inside it.The regulator's memrane is OK and I didnt find dirt or other strange.Next saturday will go to the field and do some regulator settings.ONLY!
I'm affraid to "screw" in two places at once.
Hope to solve this by setting the regulator.

I'll follow your steps.

Thank's again!

JIMMY
Old 08-11-2008, 02:18 AM
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Default RE: YS 140L inverted

Hi Petec!

Thank you for the links!

I realize It's verry useful to do a documented search, to know as much as possible about this particular type of engine.

I will never use it on an aerobatic model ( purposes ).
The next plane wich will be powered by YS, is a 1700mm. span P-47.
I like to build scale and a 4 stroke engine give an authentic sound for a warbird.
Before the maiden I need to have a thrustworthy motor.
On the P-47 will be also inverted, so my only concern is the fuel droping.
If I manage to solve this, hope to be no other problems.

Your's
JIMMY
Old 08-19-2008, 07:18 AM
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Default RE: YS 140L inverted

Hello

Thank's again for your advices!

I manage to solve the problem ,by closing the regulator.
Now all is OK, no fuel drops and the engine works fine.
Last saturday, having a couple of flights, the engine responses well on all RPM's.

Your's
JIMMY
Old 08-19-2008, 08:22 PM
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Default RE: YS 140L inverted

good to hear. you will realy enjoy that engine.

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