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Heliman

Tuskegee, Alabama

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Guys,
Im running a YS .80 pumped on my Fury. The other day I thought my clutch was giving up the ghost because when I went to start it, I had to add about three clicks more on the trim...Then get a good hold on the head....once its running I could come down about a click...more than that and she would stop....I did notice that the high speed needle barrel was loose so I tightened it back. I also noticed that after I hover, there is a river of fuel on the carb, and frame. I thought my exhaust was leaking so I installed a new Garlock gasket...I ran it without the blades for 1 minute and I saw fuel on the carb again. I have the idle screw flush with the carb body and the hovering needle 3/4 from closed and the high 3/4 from closed and it will not crank and run without adding about three clicks....I'm running 30% heli and she smokes like a train with awesome power. by the way, it didn't do this before. I Took the clutch out and checked everything and it seemed fine...after I cleaned everything off, and reinstalled it and saw it was still doing the same thing, I reinstalled my 61 SHX. clutch is fine hovers fine.

Has anyone run into this problem and if so, what has to be done?

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06-08-2016 11:55 PM
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Jason Cummings

Veteran

St. Louis

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Look over the crankcase especially around the rear bearing. It was common for the crankcase to crack there.

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06-09-2016 02:42 AM
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Flyin for Jesus

Senior Heliman

Dana Point, Ca. 92629

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Yep, you have to find the leak.
I had a leak in the plastic part below the carb where the fuel nipple pressed in. The plastic was cracked and fues was getting out.
Good luck hunting.

06-09-2016 02:53 AM
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Thatlumox

Senior Heliman

NY

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Also, a bad front bearing or bearing seal may cause a slow fuel leak.

"I'm a dirt torpedo!"

06-09-2016 04:02 PM
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swofly33

Heliman

ormond beach fl

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Ys80 leaks fuel

I had the same problem four years ago with my Fury / YS80. Finally gave up trying to fix it. Switched to electric helis and never looked back, no leaks no mess just plug in and fly.

06-10-2016 04:20 AM
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meowguy

Veteran

Saco, ME

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I had the same problem four years ago with my Fury / YS80. Finally gave up trying to fix it. Switched to electric helis and never looked back, no leaks no mess just plug in and fly.
Posts like this are just not helpful.

"Sweet dreams and flying machines in pieces on the ground." J. Taylor

06-13-2016 12:05 PM
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ticedoff8

Key Veteran

Morgan Hill, CA. USA

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I don't have a YS 80
I do have YS 60SR, 91SR-3DS, 91SR and 120SR-X

I looked at the YS 80 manual, and it uses the same type of crankcase mounted regulator with crankcase pressure (not muffler pressure) as the rest of the YS motors I own.

I assume you are using the 1-way check valve from the back of the crankcase to the fuel tank.

There should be a considerable amount of pressure built up in the tank after running - you should get a "whoosh" of air escaping after running it for a while.
The tank should hold pressure after the engine shuts off and it should hold it for 5 or 10 minutes.

If it is not holding pressure, then I suspect the carb's regulator is stuck open.

If you are comfortable with it, I would take the regulator apart and inspect the diaphragm and the short fuel line from the regulator to the carb.

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06-13-2016 04:06 PM
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Four Stroker

Elite Veteran

Atlanta

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Why don't you just pack it up and send it to Richard Verano at YS Parts and Service and have him rebuild it ?

06-13-2016 06:16 PM
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Heliman

Tuskegee, Alabama

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Mine has pressure...the tank is damn near round even though it started rectangular...when I fuel the heli I release the pressure by disconnecting the line at the tank on the one-way valve line and it sounds like an airbrake on an 18 wheeler.

Now, after installing the OS 61sxh, and a thunder tiger 70 for good measure...I know think I have narrowed the problem down.....they all idle and run up fine but then when it's gets up to flying head speed and she should be on the high needle, she leans out and dies no matter how rich you make it......this my friends is the wife or kids.....I'd bet I have a bent main or feathering, or both...
I'll let you all know tomorrow.

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06-15-2016 05:04 AM
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