RunRyder - YS 50 Carb

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Engines Plugs Mufflers Fuel > YS 50 Carb

jblanch999
Heliman
Location: Livermore, Ca

My carb isn't letting any fuel into the engine. I can't even blow into it at all regardless of needle or throttle position. It used to flood terribly if I left the tank pressurized, and now it doesn't at all.

I took the two screws out and carefully removed the plate like cover, but that is about as far as I wanted to go. I could blow into it if i pressed the little flap thing by the nipple. So the broblem is with or under that black rubber sheet with the nipple.

Help please, I am out of my element.

Thank You Run Ryders.

07-06-2008 05:31 AM

george0079
Elite Veteran
Location: Terra Firma

The first thing you need to do is make sure the check valve is working properly. That's usually the first, and easiest thing....

Note: Because of the regulated fuel system, you won't be able to blow through the fuel line. If you can blow through it, then you have a problem.

The older I get, the shorter my attention....... Oh look. A shiny penny..

Steve

07-06-2008 05:37 AM

jblanch999
Heliman
Location: Livermore, Ca

Quote
The first thing you need to do is make sure the check valve is working properly

You'll have to pardon my ignorance, this is my first YS. I believe that the check valve is like a one way valve that allows a certain amount of pressure, but how do I test it?

07-06-2008 05:53 AM

george0079
Elite Veteran
Location: Terra Firma

Blowing through it. It should allow air one way, but not the other. And, It should require a little effort, but not much.

The older I get, the shorter my attention....... Oh look. A shiny penny..

Steve

07-06-2008 05:58 AM

jblanch999
Heliman
Location: Livermore, Ca

Well George. . . I THINK that may have been the problem. It was pretty tough to blow through, so I unscrewed it and blew through both sides and I'm guessing there was some sort of membrane on one side. . . I felt something give. Now it is free both ways, so I'll have to trek to pick one up tomorrow.

My question is this: If the check valve was the problem then would turning the motor pressurize the tank? This is why I didn't think it was the check valve or that tubing. It was pressurizing consistently.

07-06-2008 06:32 AM

george0079
Elite Veteran
Location: Terra Firma

Quote
If the check valve was the problem then would turning the motor pressurize the tank?

It may not have been getting enough preasure if the check valve wasn't working properly.

The older I get, the shorter my attention....... Oh look. A shiny penny..

Steve

07-06-2008 06:41 AM

tadawson
Key Veteran
Location: Lewisville, TX

Quote
It used to flood terribly if I left the tank pressurized, and now it doesn't at all.

This is not normal - not passing fuel when not running *is* normal . . . if anything, it sounds like a problem went away.

The regulator gets a pressure pulse up the small port under the carb from the crankshaft area, and that pushes the regulator diaphragm up, opening the regulator momentarily, and allowing fuel to pass. So, if the engine is not turning, you should see nothing. If the valve will open when you have it apart and press on it, then that is ok. If nothing with the engine turning, and you get tank pressure, then it sounds like perhaps a bad diaphragm.

Bottom line question is: Does it run? If so, then you don't have a problem . . . all is as it should be . . . .

Oh, and the check valve should be pretty hard to blow through in one direction, and impossible the other. It should never be easy . . .

- Tim

The more I touch electrics, the more I grow to hate them . . . .

07-06-2008 07:08 AM

whaleboy
New Heliman
Location: Los Angeles, CA

So if I have the throttle open a bit and the engine is not running, but the tank is pressurized, I should NOT have any fuel leaking out of the carb? I have a brand new YS50 that did leak like mad in that case... I'm new and when breaking the engine in the first day it would die after landing (I probably had the idle too rich?). I didn't think to clamp the fuel line, and noticed it was leaking fuel... not a little bit either, practically pouring out. It took a while to realize where it was leaking from. But since clamping the line to kill the engine (doesn't die on idle after landing any more), I've had no more leaks, and the engine seems to be running great (as far as I can tell). I guess I can test it and use the radio to kill the engine and see if it starts leaking again... or maybe its fixed itself?

-David

07-06-2008 07:59 PM

tadawson
Key Veteran
Location: Lewisville, TX

Throttle position does not matter. If there is no pressure in the crankcase to open the reg, fuel will not flow. If for some odd reason, it *did* stop at TDC, then it might leak a bit until the case pressure bleeds. (This could also maybe happen with a checkvalve that leaks - letting pressure back into the case). Otherwise, the only reason the reg would allow flow when not running is that it either has crud in it, or is faulty. While I try to clamp/vent when I land, there have been times I have forgotten until I get back to the pits - and never leak a drop . . .

- Tim

The more I touch electrics, the more I grow to hate them . . . .

07-07-2008 06:19 AM

whaleboy
New Heliman
Location: Los Angeles, CA

hmmm... well I guess I had something faulty or dirty. Everything seems good now though, but I do clamp it to kill it. I'll try a test next time out and not clamp the line and see if it leaks again.

Thanks

-David

07-08-2008 05:00 AM

tadawson
Key Veteran
Location: Lewisville, TX

Clamp and vent on shutdown *is* still the recommended procedure. Ever forget to vent and try to put fuel *in* and unclamp the filler line? Not pretty . . . and helps you remember to vent quite effectively!

- Tim

The more I touch electrics, the more I grow to hate them . . . .

07-08-2008 05:06 AM

yoshgixxer
Senior Heliman
Location: york PA usa

[quote]Ever forget to vent and try to put fuel *in* and unclamp the filler line? Not pretty . . . and helps you remember to vent quite effectively!

haha i did this the other week...and by the time i got the vent line off the tank i had pissy pants!!

haha and totaly fuel coverd pants,hands,shoes it was deffinatly not preaty!

dude..wheres my heli?????

07-09-2008 05:57 AM

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Engines Plugs Mufflers Fuel > YS 50 Carb

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