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HelicopterEngines Plugs Mufflers Fuel › YS .61ST hard start/idle
01-22-2010 11:39 AM  8 years agoPost 1
jermo

rrNovice

Fort Mill, SC - USA

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I'm using coolpower 30% with an enya #3 plug. 2 needles are at factory settings. I have to jocky the throttle to get it started. Anyone have experience with this motor? Once it's started it runs well as long as I keep a high idle (just barely keeping the clutch engaged). If I get below about 1/3 throttle the engine will eventually sputter and die. After it's run for about 5 minutes it will idle for a short time at low stick then just die (doesn't lean out).

Based on the docs for the motor there's no adjustment for the idle..

Thanks in advance.

Jermo

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01-22-2010 04:43 PM  8 years agoPost 2
oldfart

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Vancouver, Canada

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I suggest that you carefully re-read your manual for that engine.

You will find that it certainly does have an idle needle.

Different then the OS, this YS carb is set by adjusting the big needle for the proper setting in idle and hover, then you adjust the little screw needle on the side to optimise the the top end.

Of course, if you have it in a heli with blades and gearing that does not load the engine properly, it will make it far more difficult to get the two needle working as they should.

Also be sure that the one-way valve for the pump is not sticking.

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01-22-2010 06:37 PM  8 years agoPost 3
seflyer

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Northern California, Palo Cedro

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a lot depends on if you have a ST-1 or ST-2, the ST-1 does not have a low speed mixture screw. the st-2 has two large needles and on small slot screw in the throttle barrel. the st-1 has no idle screw on the throttle barrel/butterfly. the -1 can be difficult to find agood balance between idle and transition, but can be done.

Kevin

My heli is right side up -- the world is upside down

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01-22-2010 11:12 PM  8 years agoPost 4
imnxtc

rrVeteran

BC.Canada

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The original ST (many called the ST-1) had the fat main needle for adjusting the hover/idle mixture and a top end screw, as described by Oldfart, for tweeking the top end AFTER getting a nice hover setting.

I bought a couple of thm at great prices, from some pretty good pilots at the time, because they could not get them to run well. I did not think they had not read the instructions properly to realize how the needles were different from those on the OS's we were used to.

Later when one saw how well mine ran after I installed his in my heli, he asked me how I got it to runs so well. So I explained the needles to him. He slapped his forehead and confessed that he was not aware of this difference. He subsequently bought another and set the needles as they should be and loved the engine.

The ST-2 had the three needles, with the screw now being the idle screw, with seperate big needle valves for hover and top end.

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01-23-2010 01:24 AM  8 years agoPost 5
jermo

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Fort Mill, SC - USA

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Thanks for the replies. I guess I just need to keep working on it. Starter stopped working today. Not sure if it's battery or the starter..don't have another battery ..hehe..
Jerry

Jermo

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01-23-2010 02:55 AM  8 years agoPost 6
rotaryfalcon

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S.E. USA

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Another thing to consider is wear. I have one in an older Freya I recently got. Hard to get started, have to keep the idle up initally, but after a few circuts idles great, and shows good power. Had the pipe off the other day, and realized the poor little thing needs a piston and ring!

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01-23-2010 06:33 PM  8 years agoPost 7
jermo

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Fort Mill, SC - USA

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I tried again today with no success.I'm just trying to get it started and idle. I'm going to contact the guy I bought it from and see what can be done. Worse case I'll take it apart and have a look.

Jermo

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01-24-2010 10:14 PM  8 years agoPost 8
jermo

rrNovice

Fort Mill, SC - USA

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I called the previous owner. I thought I had purchased the .61ST, I have the ST2. I got the correct manual and there's another adjustment for idle. Chopper fired up at idle first try and ran steady ..

Thanks for all the help.

Jermo

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01-25-2010 07:01 PM  8 years agoPost 9
imnxtc

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BC.Canada

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.....2 needles are at factory settings. ....Based on the docs for the motor there's no adjustment for the idle..
From those two statement in your original post, one could well have thought that it was a new engine and not one purchased from another.

Glad to hear you got it all working now.

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01-25-2010 10:13 PM  8 years agoPost 10
bullseye1

rrApprentice

Orange County, ca

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Check your one way valve and make sure the fuel tank is pressurized, and the check valve installed correctly, low tank pressure will cause the engine to starve and quite on low throttle.
The only thing I had to do to mine is adding a header tank to get rid of a heckup during very fast transitions and it did the trick.

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HelicopterEngines Plugs Mufflers Fuel › YS .61ST hard start/idle
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