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HelicopterEngines Plugs Mufflers Fuel › YS 50 wont start
12-23-2008 02:56 AM  8 years agoPost 1
rsimon123086

rrApprentice

Beaumont TX

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this weekend I went out to fly and the engine started up fine. I hovered around a little till I got it warmed up. It seemed like it was leaning out a bit so I landed it and gave it a few clicks out. Ran it back up to speed and got back into a hover and it died. I thought it might have been the plug but after I changed it I could not get it started. So I pulled off the carb and took it apart and made sure it was clean. Everything appeared to be good but once back together still couldnt get it started. The plug glows good when out of the engine so im pretty sure that its fine. Also tried putting fuel in the carb directly and in the head but still wouldnt even fire once. So any suggestions?

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12-23-2008 03:07 AM  8 years agoPost 2
george0079

rrElite Veteran

USA

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Diaphram in the regulator.
check valve
preasure line
If if any of these are not working, the engine won't run.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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12-23-2008 03:13 AM  8 years agoPost 3
rsimon123086

rrApprentice

Beaumont TX

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check valve is working and holding pressure in the tank. The diaphragm I thought looked fine but I could be wrong.

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12-23-2008 03:16 AM  8 years agoPost 4
george0079

rrElite Veteran

USA

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YS engines are like Chinese puzzles. EVERYTHING has to be just right for it to work.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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12-23-2008 03:19 AM  8 years agoPost 5
rsimon123086

rrApprentice

Beaumont TX

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It has been the best engine I have ever used until saturday and then poof after about 2 minutes it stops and wont start.

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12-23-2008 03:21 AM  8 years agoPost 6
george0079

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USA

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It has been the best engine I have ever used
I totally agree. YS is all that I fly. But they can get real tempermental when things aren't right.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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12-23-2008 04:56 AM  8 years agoPost 7
rsimon123086

rrApprentice

Beaumont TX

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mmmm... I think i may have found the problem. I was turning the engine over by hand and it seems to have alot less compression than it did. I replaced the ring only a half a gallon ago. I guess i will take it apart tomorrow and see what the real problem is.

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12-23-2008 05:02 AM  8 years agoPost 8
Santiago P

rrProfessor

South West, Ohio

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YS engines are like Chinese puzzles. EVERYTHING has to be just right for it to work.
That is so right. Make sure there are no leaks in the fuel system either. If the tank can't hold the preasure the the YS will run for a short time, lean out and die, if it stays running at all. 95% of the YS problems I encountered were tank problems, not engine problems.
good luck

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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12-23-2008 06:17 AM  8 years agoPost 9
bcm

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Tuolumne,CA

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I'll bet you find the ring land compressed and the ring is "stuck" in the piston. Not sealing well enough to run.

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12-23-2008 06:40 AM  8 years agoPost 10
rsimon123086

rrApprentice

Beaumont TX

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if this is the case is the ring bad and needs to be replaced or just freed up?

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12-23-2008 11:51 AM  8 years agoPost 11
airdodger

rrElite Veteran

Johnston USA

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You will need a new piston and ring for sure, and if you want the engine to run as well as new, a liner. Tell everything you did and know about the engine when posting a problem. How would anyone know you just worked on the engine, oh I know our crystal ball.

Chris

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12-23-2008 12:44 PM  8 years agoPost 12
KevinB

rrKey Veteran

Saskatoon,​Saskatchewan, Canada

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That happened to me once last summer. Was running great then the next time I went out, the diaphram had stuck to the surface in the check valve. I took the check valve apart ( be careful not to lose the little spring and guide ) and actually needed to soak the half of the valve with the stuckon diaphram in fuel to unstick it. Not sure why it did it that once but it hasn't done it since.

When it was stuck, it would let just enough pressure through to fuel the engine up to about 1/2 power. It you asked for any more, it would flame out.

I'd take a real good look at the check valve before rebuilding your engine. I know you said you looked at it already, but did you actually have the diaphram out or just looked at it?

KevinB

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12-23-2008 10:16 PM  8 years agoPost 13
rsimon123086

rrApprentice

Beaumont TX

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So I guess I am in the market for a new engine. Does anyone know where I might find the best deal. Oh and as far as YS vs OS which are really more reliable? Ill be using an MP5

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12-23-2008 10:40 PM  8 years agoPost 14
baddynergy

rrElite Veteran

sierra madre, ca-​usa

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YS vs OS which are really more reliable?
I would have to say the TT redline 53 is more reliable. Been running it a year now with NO issues( at least 15 gallons). The MP5 is a great pipe for that engine.

**Unattended children will be givin a shot of espresso and a puppy**

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