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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Ys96srx Tareq help
02-12-2021 10:22 PM  18 days ago
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honda411

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Ys96srx Tareq help
Hello guys, I know this should probably be in the engines section but for now I need quick eyes on this situation.
I have a ys96srx tareq engine that has idle problems up the whazoo. I notice air bubbles in the clear tubing going from the regulator to the carb. Extremely inconsistent idle. It won’t even idle unless I keep throttle applied. Tried rich, tried lean and it runs high and low. It smokes a lot when it does actually run. Smoke appears consistent and great on mid and high needles except performing tic tocs it runs lean and virtually no smoke but once in governors okay. I did a lot of high speed continuous circles to heat it up and looks okay and sounds okay. I watched Tim’s tuning videos and seems like it’s tuned mid and high needles decently. It sometimes surges on idle, sounds like a solid idle in terms of very lean and also sometimes pings. I know this is very lean but when I richen it, it immediately dies. Currently 1/2-3/4 out on idle. About 1.75 on each mid and high roughly but can’t fully tune due to idle.
-Ys96srx
-Current OS8 plug (blew the enya 3) picture provided
-cool power 30%

I am ordering a new diaphragm, o-rings, fuel tubing, plugs, check valve and all other related parts to the regulator.

Again bubbles in the clear tubing from regulator and carb at idle. Only way it stays running is enough throttle that blades try to turn.
These photos are from the enya 3 that was in it. The coil is charcoal color like the edge is, pushed to one side of the plug also.

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-13-2021 04:05 AM  18 days ago
Dave's Raptor

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YS96SRX
Hey Chris, check out this thread https://rc.runryder.com/t819993p2/ post 22, and then post 23. The link on post 23 if you read down you will see a similar issue as stated in post 22. Looks like they used silicone over the idle set screw and it resolved the air bubble issue. Hopefully this helps you out with your troubleshooting.

Dave
Team HeliDirect, Team Synergy USA, Team Scorpion USA, Team Rail Blades, Team Scorpion, Team ThunderPower USA
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02-13-2021 06:16 PM  17 days ago
honda411

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Hi Dave thank you for the reply. I looked at that thread and the regulator adjustment screw I’m assuming is the small flat head looking screw or the screw in the regulator body. If this is the one, it appears the screw has a cover or silicone on it from the factory.

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-15-2021 05:11 AM  16 days ago
Rojoalfa

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Don't mess with this little setting screw till you know for sure that this is the problem.

Regulator is a high pressure and close system.
If you see bubbles, it come from tank.

/
Saludos cordiales,
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02-16-2021 07:36 PM  14 days ago
honda411

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Well see that’s the odd part. No bubbles can be seen in the line coming from the tank. Only from what I can see is coming from between regulator and carb.
You can’t even get any parts for these engines either. Everyone is out of stock of diaphragm and gaskets.
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-16-2021 09:02 PM  14 days ago
crflyer

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YS engines require an absolutely tight fuel and exhaust system.
In most cases the problem is a fuel line leak or a sticking check valve.
Flush the check valve with some fuel or replace it, try to blow through it to see if its working. And replace all fuel lines, replace the clunk line in the tank also.
Don't mess with the regulator settings.
It sounds like the check valve is acting up giving you the lean runs, also a bad check valve will make the engine shut down when you try to throttle it up.
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02-16-2021 09:32 PM  14 days ago
Rojoalfa

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Ok... I understand your point.

Let assume we have a faulty screw that for some reason is letting pass air thru the regulator.
A regulator handle high pressure coming from tank and feed in with a constant pressure our Carburator.

So, you are telling us that the atmospheric "air" have more pressure than the glow passing thru the regulator?
If this was the case, your YS would be bleeding glow directly from the regulator.
It doesn't make sense my friend.

Sorry my English.

That bubbles you see in that tiny tube is cause by pressure drop... It is call a vaccum pressure. That vacuum pressure let the methanol vaporize... So, you see bubbles...
Bubbles of methanol and not air!!!

Well, I know this is a very boring and a technical matter but you have two choices to solve the issue...

1. Close the needles to build up the intake preasure of carb.

2. Open regulator to feed more pressure to the carb.
You need to readjust needles after messing with the regulator.

Both solution prevent methanol to vaporize.

I will do the second choice..but...be Careful.
Open the regulator mean more high pressure glow passing to the carb and need a complete readjusting needles.
It would be better do this on a bench.

Remember...
Regulator give pressure.
Needles give Flux.

YS engine is going to take what it needs... The rest is going to be on the fan shroud.

/
Saludos cordiales,
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02-17-2021 03:28 PM  13 days ago
honda411

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Crflyer, it’s just at idle that I see bubbles in the clear tube and the idle is severely irrational, inconsistent, and shuts off randomly. If I can actually keep it idling, it will spool up just fine. And then random lean runs in flight. Check valve appears good. It holds tank pressure and doesn’t blow through in reverse.

Rojo, thank you for the detailed reply. Your correct and I would think it would leak glow fuel from where it would supposedly be sucking air. I was only told this from other Heli flyers but from what I know, there is higher pressure after the tank and after the regulator to the carb, so yes then it would bleed glow fuel. I never heard of the vaporizing but your right it could be it.
Are you readjusting the screw that is covered under silicone on the regulator? The flat head screw?

A new problem exists now, that if I don’t release the tank pressure right away, it slowly floods the carb and dumps fuel out of the carb inlet
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-17-2021 06:09 PM  13 days ago
crflyer

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On the idle, make sure your throttle trim is opening the carb enough for a reliable idle, sounds like its to closed
If fuel is leaking by the regulator and out the carb when the heli is sitting, you should think about replacing the entire regulator.
The second pic shows the regulator leaver, if this an older engine its probably worn down and leaking by the leaver seal.
And if you do install a new diaphragm make sure its installed correctly, I've seen these diaphragms put in upside-down.

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02-17-2021 08:20 PM  13 days ago
Rojoalfa

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This regulator is triggered by the spinning action of the crankshaft. This back pressure is send to the regulator, opening and feeding the carb.

If the regulator is flooding the carb with glow, It means the screw is out of calibration or the diaphragm is broken, communicating both constant and high pressure system with crankshaft.

A great mess by the way...

PD

Dirty, moisture could also cause such a mess.
Clean the area, take pics and share with us your observation.

/
Saludos cordiales,
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02-18-2021 07:46 AM  13 days ago
honda411

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Crflyer thank you for the pictures. I can’t even find a regulator anywhere in stock or diaphragms.
The barrel of the carb is open quite a bit. So it acts like it’s not open enough and shuts off randomly but immediately. If I raised the trim maybe a click or two the idle is so high that the blades want to spin pretty good. And if it actually does get flying, when I come in to land, the engine is running at a smooth constant lean and not even pinging anymore.
Rojo, thank you for also sticking in here with me on this. I will tear it down tomorrow and take pictures of all internals and of the outside of the regulator.
But this engine is near useless at this point since not all parts are available to complete the entire rebuild.
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-18-2021 07:15 PM  12 days ago
Rojoalfa

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There are places to get spare parts...

Also, if you have a 61G Carburator from OS, you can get rid of this regulator.

Check this adaptor flange...

https://rc-carbonstore.com/OS-61-Ca...-120-Conversion

/
Saludos cordiales,
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02-18-2021 07:34 PM  12 days ago
Rojoalfa

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Let assume for a moment that your regulator is OK and it was out of calibration.

Let assume that we finally calibrate this little monster.
All the internal parts are clean.

Back on the original problem, motor has the same problem with the idle.

This problem in most of the cases is related to :

1. Bad Front bearing (loosing pressure).

2. Crankcase back plate with bad seal or loose.

3. Fitting on crankcase loose.

/
Saludos cordiales,
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02-19-2021 04:47 PM  11 days ago
honda411

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Okay got it torn down and very interesting find. From what I can see the regulator and diaphragm look good. On the other hand some other internals did not look so well. This has ended in a more costly repair. The engine never appeared lean when I first started flying it and then the random lean mixture. Makes me wonder if something causing the lean mixtures ended up ruining other components inside. I don’t entirely believe the piston and ring is the root cause but rather a side effect of what is causing the lean mixture. This would also explain the glow plug damage in the first post. A very very very small hole was patched on the fuel tank at the top nipple when I pressure tested it. Not enough to make any difference during flight.
The scratch on the back of the regulator body does not appear to be all the way through and only superficial. I did patch this also since I cannot find anywhere that has the body in stock.
The rear bearing I believe needs replacing also since I can see the crank spin just a small amount without the inner race of the bearing spinning.
What a nightmare!

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-19-2021 07:03 PM  11 days ago
crflyer

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The damage was caused by a few lean runs.
YS Engines require a leak free fuel system, if the fuel tank has been patched it needs to be replaced, I've never seen a repaired fuel tank last very long.
The regulator is probably fine, flush it with fuel to be sure.
Replace the check valve before you run it again and be sure there are NO leaks in the fuel system. I've had check valves last several gallons of fuel and some fail after just one gallon. Inside the check valve is a small silicon disk, it can swell up and then hang up not pressurizing the fuel tank correctly, it may act fine while bench testing ,but wont be up to the task when in full flight
If the carb needles are set correctly but you get on and off lean runs in flight its usually a fuel line leak or a check valve failure.
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02-19-2021 07:23 PM  11 days ago
honda411

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That sounds good to me. Yeah I’ll order a new tank, new clunk line and replace everything in between. My best assumption is the diaphragm in the regulator looks okay.
Could there maybe be blow by from the broken piston and causing air or pressure in the regulator?
High needle 2 1/8th , mid range 2.25 and low is 1 turn
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-19-2021 09:23 PM  11 days ago
crflyer

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Maine

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A broken or worn piston ring will prevent the engine from pressurizing the fuel system properly because of lost compression.
Thus the lean runs.
You need to start over, rebuild the engine with new piston, ring and sleeve.
Replace the fuel lines and check valve.
reset the needles and do a proper break-in of the engine.
When setup correctly YS engines run great.
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02-21-2021 01:48 AM  10 days ago
honda411

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Your 100% right and I’m going to be replacing as much as I can. New tank, lines, check valve, regulator components, any o-ring I can gets hands on for the needles, rear bearing and new top end.
Btw, is there an upgraded rear bearing for this engine?
HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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02-21-2021 02:03 AM  10 days ago
Rojoalfa

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honda411 The engine never appeared lean when I first started flying it and then the random lean mixture. Makes me wonder if something causing the lean mixtures ended up ruining other components inside.
/
/

Yes. The failure was a component between intake pressure and mixture setpoint.

IMHO, two thing could happen:
(assuming no front bearing leaking...)

1. low pressure intake and a lean mixture.(high needle)

2. High pressure intake and a lean mixture.(high needle)

The problem was a setting with a lean mixture that went terrible bad.

Front bearing... I suspect of this guy... It is probably leaking.

Can you do a test?...
We need to pressurize crankcase to see for leaking... With 120 mmHg.
Also, the outside of the front bearing could be oily or dusty.

As you can see... With a failure on the front bearing, a different history we may have.

The other history is...
Regulator was OK, mixture was ok but because of the faulty front bearing, motor suck more air, making the mixture lean.

Mixture lean... Your YS was working hotter and hotter.

/
Saludos cordiales,
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02-21-2021 01:51 PM  10 days ago
honda411

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Rojo, very well could be and maybe I should just replace both bearing to be safe. Not sure how I can pressurize the crankcase though. The front bearing appears to be clean and not oily or dusty.HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades
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