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HomeAircraftHelicopterAlignOther › ys50st dies in flight---- PROBLEM SOLVED-----to much fuel pressure
03-10-2008 04:15 AM  10 years agoPost 21
brcg123

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Wagoner OK USA

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nappyroots2182, why are your needles at factory settings? if its new, breaking in, your supposed to add 1 to 2 turns to high side needle not factory settings to break in.








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03-10-2008 04:16 AM  10 years agoPost 22
nappyroots2182

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Moline, il

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cuz even at factory its too rich to spool up. im trying to get it hovering to get fuel through it. its got me stumped

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03-10-2008 04:17 AM  10 years agoPost 23
brcg123

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Wagoner OK USA

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no kidden. so you have the same issues going on?








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03-10-2008 04:20 AM  10 years agoPost 24
brcg123

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Wagoner OK USA

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what tailpipe are you running








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03-10-2008 04:20 AM  10 years agoPost 25
nappyroots2182

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Moline, il

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align

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03-10-2008 04:22 AM  10 years agoPost 26
brcg123

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Wagoner OK USA

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thats not an issue then








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03-10-2008 04:43 AM  10 years agoPost 27
psych-lick

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Portland, OR

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Furious hit the nail on the head.
The problem is most likely your regulator (not the check-valve). There is a valve that opens via a diaphragm. This diaphram is cheap and is easily replaced.
There is some dirt either in the valve (pin hole sized) or in the diaphram or the diaphram is broken/torn.
The purpose of this valve is to stop fuel flow in order to keep the engine from flooding and only open when the carb is asking for fuel (suction phase). Since the tank is always pressurized, if the valve stays open then fuel will constantly flow into the carb.

Don't be afraid to take the carb/regulator assembly apart to investigate. If in doubt, send it in for service.

http://www.ronlund.com/Merchant2/me...uct_Code=YS5340

-Jeff T.

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03-10-2008 04:44 AM  10 years agoPost 28
nappyroots2182

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Moline, il

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so ive only run not even a full 4 tanks of fuel on it and now i have to tear the carb apart. last time i did that on a ys motor i had to buy all new gaskets and diaphram.

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03-10-2008 04:45 AM  10 years agoPost 29
Simmer

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Massachusetts

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Hey you know what I just remembered! Its very important that the length of the fuel tubing be just so. If its too short or too long (not sure exactly the correct length) but I do know I was told when I got mine (used and running really well) to make sure to not change the length of the tubing. Perhaps there is info out there or someone else can measure the tubing on a working 50YS to get you to a starting point.
Again I dont know why but the guy who sold me the heli was very meticulous and told me it made a difference. Another easy to check thing, so long as someone can get you the info.

Tony ? have some measurements

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03-10-2008 04:57 AM  10 years agoPost 30
nappyroots2182

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Moline, il

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i thought so. ill try to put my other shorter tube back on in between the regulator and backplate. i heard it too but nobody seems to know about it. its the only thing i really changed since it took a crap. hmmmm...... now i have to figure out an excuse to go flying a few more days in a row

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03-10-2008 11:41 AM  10 years agoPost 31
david11cap

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Madison, CT

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The motor does come with a pre cut fuel line. I would never go away from replacing it. YS knows more about the motor than we all do, so diverting or changing from what they say is only asking for troubles.

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03-10-2008 01:13 PM  10 years agoPost 32
wo23dodge

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Omaha Ne, USA

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I can't find it right this second but there is a diagram of the fuel system on ronlunds site,shows the check valve being only 35mm away from the engine.

before I saw this thread again I ordered that DIAPHRAGM,just incase that was the problem.

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03-10-2008 02:06 PM  10 years agoPost 33
creightoncarr

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Missouri City, Texas - USA

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nappyroots2182, why are your needles at factory settings? if its new, breaking in, your supposed to add 1 to 2 turns to high side needle not factory settings to break in.
The manual very specifically states to break in at 1.5 turns on the high needle.

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03-10-2008 02:50 PM  10 years agoPost 34
Sam2b

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Tacoma, WA

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The motor does come with a pre cut fuel line. I would never go away from replacing it.
What if there comes a time when you must replace the pre-cut fuel line? What type of fuel tubing is recommended? (of course it will be cut to the manual's specific length)

_Sam B_

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03-10-2008 02:53 PM  10 years agoPost 35
JuanRodriguez

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The Villages, Florida

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Sam,
Any decent fuel tubing should do. I would stay away from the thin walled fuel tubing, though......

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03-10-2008 03:07 PM  10 years agoPost 36
Sam2b

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Tacoma, WA

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...

_Sam B_

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03-10-2008 03:31 PM  10 years agoPost 37
Simmer

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Massachusetts

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Man I just cringe when people talk about using after run oil.

Prob not your issue, but what kind of after run oil? Any castor or petroleum byproducts in it? It got hot thats for sure, and the brown looks suspiciously like burnt castor.

Not that that simply a never do bad thing, its just not recommended.

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03-10-2008 03:40 PM  10 years agoPost 38
JuanRodriguez

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The Villages, Florida

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WOW !! Lean run for sure !! Does not look like ingestion to me as the damage is too spread out.

Look for any obtruction in our fuel delivery system, including any obstruction in your clunk that may have been left behind during the machining process....

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03-10-2008 04:09 PM  10 years agoPost 39
davidjc

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E-Town , Kentucky

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Try going to this web site and read up on the engine and if that fails call the guy up he's real easy to talk to and if he can't fix it I don't know who can. IMHO
http://www.yspartsandservice.com/

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03-10-2008 04:10 PM  10 years agoPost 40
creightoncarr

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Missouri City, Texas - USA

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I say dump the YS50 and go to a Hyper or TT53. I've always had good experiences with the YS91ST and SR's, but my experience with the 50 is anything but. I have one that runs fantastically and two that have had nothing but problems. I know plenty of people use the YS50 and love it, this is just my opinion. If you get a good one then it will serve you well. But if you get a problematic one it will just continue to cause headaches.

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HomeAircraftHelicopterAlignOther › ys50st dies in flight---- PROBLEM SOLVED-----to much fuel pressure
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