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Futaba-RC JR AMERICAS Heli-Max
f4urak

Heliman

Newberg, Oregon United States

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My YS 60SR/Hatori Sab1 has been running great i have 7 gallons through it. I've been running cool power 15% YS blend made for the 120 and also cool power 30%. A couple days ago it was flying great then went super rich mid flight, it was still making some power but there was a noticeable difference i checked the Head temp in my telemetry it was down at 145 where it is normally between 180 and 200 when it is tuned and running good. I have flown it probably another 12 flights and it will do this about every 2nd or 3rd flight, I have had it come back mid-flight and run good again. It usually always starts out fine then goes rich a minute or two into the flight. It seems the fuel pressure is varying somehow. Has anybody else had this issue?

08-06-2013 Over year old.
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meatbomber

Senior Heliman

Klatovy, Czech Republic

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Is that a 2 piece hatori? If yes then you might want to check the o-rings on the header. . We had a similar issue that the heli went super rich when inverted only and it turned out to be the orings

08-06-2013 Over year old.
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f4urak

Heliman

Newberg, Oregon United States

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It's a single piece muffler, I hadn't questioned the check valve because it always has a lot of pressure after the flight but I blew through it and it wasn't opening freely and would wistle I pulled it apart and found nothing wrong when i put it back together it seems normal and air flows freely. When it opens there is a nice poppet sound.

08-06-2013 Over year old.
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TMoore

rrMaster

Cookeville, TN

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It's best to draw through a check valve. Blowing through it isn't the most positive way to confirm that it works. Fuel tank pressure is going up in flight. That is the only way that you are going rich on that engine. Something is changing the fuel delivery pressure so that's the first area to look at. What could that be?

TM

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08-13-2013 Over year old.
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Gary H

Veteran

Minnesota USA

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Fuel pressure. This has happened to me also, I was useing another brand check valve, (wrong). Make sure you use only the YS2510 check valve, your problems should be over!! you go rich mine went lean. I lost 2 engines useing another brand!!!!!

GH

08-14-2013 Over year old.
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johnbs8

Key Veteran

roseville michigan

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So was this issue ever resolved?

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11-06-2013 Over year old.
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Mike0251

Veteran

Hills of the Blue Ridge VA

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Also check the main needle spring clip. They are easily tweaked by a finger nail inadvertently and may no longer be applying enough pressure to keep the needle set. Happened to me on a YS 90...but it went lean. Had to rebuild it. I now put a small length of fuel tubing around the needle and the clip. Won't happen again. Mid range needle is ackbasswards with the spring clip and out of harms way.

11-07-2013 Over year old.
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f4urak

Heliman

Newberg, Oregon United States

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After installing the new check valve I have about 15 gallons through it and not an issue. Very happy with the YS 60 I am running ys blend 15% and has plenty of power.

02-01-2014 Over year old.
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