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HelicopterEngines Plugs Mufflers Fuel › YS 91 -air bubbles between regulator and carb
10-20-2004 09:36 AM  13 years agoPost 1
3DPP

rrApprentice

Vienna/Austria

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Hi guys,
need help please.
I was flying 6 gallons without troubles. From one to the next second if I switch from 1750 rpm to 1550rpm I saw a leaning out on my telemetrysysthem,not much only a little.So I switched back and tried it once again,same happened.
I come down in an autorotation and opened the midrange a quater turn and wanted try it again, up to 1750 all well, switched down the motor to 1550 and he leaned complete and stopped.
I tried it again on the earth and had a look to the fuel lines,line to the regulator ok no air bubbles, but in the small line between regulator and carb I saw air bubbles if I switched down the rpm.
The small line is ok, no leak.
The screws on the regulator are looking well sitting
Pressure on the tank is also ok.
If you have any ideas, they are very welcome
thanks peter

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10-20-2004 10:01 AM  13 years agoPost 2
jetsurgeon

rrVeteran

Raleigh, NC

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Peter,

Small bubbles in the fuel line between the diaphram and carb are ok, every YS engine I've seen has them.

Jeff

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10-20-2004 02:37 PM  13 years agoPost 3
3DPP

rrApprentice

Vienna/Austria

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Jeff
Air in the fuel line?
Thats strong,this I do not like to hear, so the mistake must be on another place.
It´s possible that only some dirtiness is on the midrange needle?
thanks peter

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10-20-2004 06:05 PM  13 years agoPost 4
jetsurgeon

rrVeteran

Raleigh, NC

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Peter,

Yes small bubbles in the small fuel line between the pump outlet and carb inlet is ok (located at red arrow on photo below), all YS's seem to do this.

Doing a quick and dirty search yields these plus many more hits, all stating the same.

http://runryder.com/helicopter/t133...ight=ys+bubbles
http://runryder.com/helicopter/t128...ight=ys+bubbles
http://runryder.com/helicopter/t861...ight=ys+bubbles
http://runryder.com/helicopter/t805...ight=ys+bubbles
http://runryder.com/helicopter/t154...ight=ys+bubbles


Hope this helps,

Jeff

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10-20-2004 06:23 PM  13 years agoPost 5
HelicopterJohn

rrKey Veteran

Seffner, Florida​(Just East of Tampa,​Florida)

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Air bubbles

A buddy of mine just got a new YS110 (plank use) and that fuel line is now a darker blue so you can't see the air bubbles.

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery

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10-21-2004 06:46 PM  13 years agoPost 6
3DPP

rrApprentice

Vienna/Austria

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I brought the engine out from the helicopter, demounted the engine complete, had a look for everything.
Found nothing, cleaned all, mounted the engine and brought it back in the helicopter.
The needle setting which was to lean at the end, now was much to rich,also the needle setting which were good for 6 gallons was also to rich.
I leaned him out and all is well now.
May be the diaphragm was not sitting well inside,but it looks ok for me.
Only one thing now is different, the srews at the regulator now more tight as before because I could disengage them very easy with two fingers and a small screwdriver.
Thanks for your comments
Peter

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