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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Help: Unable to start YS50ST Engine
06-07-2009 05:29 AM  9 years agoPost 1
rudyy

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E. Amherst, NY

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I recently bought a used YS50ST engine in RR. I am able to start the engine successfully for the first two times two days ago. Today, when I start it, there seems to be a big resistance to the hex starter. I thought it is hydrolock, but it is not because no fuel is coming out from the glow plug hole. Also I find there is no fuel in the tubing going into the engine.

I check the YS50ST manual. Under the starting procedure of the instruction manual, the first step it says removing the tube between the check valve and the fuel tank to release pressure of the fuel tank. Is this the cause of my problem?

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06-07-2009 06:53 AM  9 years agoPost 2
tadawson

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Lewisville, TX

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No. You releive pressure at the end of a flight to prevent flooding. If it's not flooded or hydrolocked, pressure has nothing to do with it. Did you lay it on it's side when checking for a flood, and turn it over to make sure the case was not full? When starting, pressure builds in the first few seconds the starter is running anyhow . . . .

- Tim

Friends don't let friends become electrotarded . . . .

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06-07-2009 12:48 PM  9 years agoPost 3
ch-47c

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san jose, ca

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All YS engines have to be setup correctly. Once it's done, it is set it and forget it. Make sure tube "c" is exactly 35mm long. The rest are cut to the length you want. Make sure the check valve is in the correct direction by the arrow on its case. If you're not sure, put a peice of fuel line on one side and blow into it while the valve is submerged under fuel or water.
Set the idle needle valve to one turn out. The high speed needle about 1.5 to 1.75 turns out.
I use OS #8 glow plugs and CP 30%. It sounds like your starter battery may need a little more charge to turn the engine over.

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06-07-2009 01:35 PM  9 years agoPost 4
airdodger

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Johnston USA

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If excess fuel is not causing the problem, you need to look inside the engine exhaust port to see if the engine is ok. Your starter is strong enough to turn the engine over at a fast rate right? All lines have to be connected to get the engine to run correct.

Chris

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06-07-2009 03:20 PM  9 years agoPost 5
rudyy

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E. Amherst, NY

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Find the problem. The engine nut is loosened, causing the fan and the whole clutch assembly binding.

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