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HelicopterEngines Plugs Mufflers Fuel › YS56SR hard starting
06-02-2014 09:12 PM  3 years agoPost 1
mustang67ford

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Central Pennsylvania

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For some reason, I am having a hard time getting my motor to start for the first run of the day. I'll turn it over repeatedly for long periods of time and no start. Eventually it will go though. I aldo noticed i had to richen up the high needle about 4 or 5 clicks and the low speed needle about 3/16 to 1/4 turn. I also pu a new plug in it. Once it starts for the day, restarting is no problem. Any suggestions? Maybe open the carb the whole way, plu the muffler and turn over before applying glow plug power to prime it?

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06-02-2014 09:27 PM  3 years agoPost 2
airdodger

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Johnston USA

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Just pressurize the tank while putting in the last bit of fuel, with the fuel pump. Don't let go of the line before you plug it or fuel will squirt out of the line.

Chris

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06-02-2014 11:26 PM  3 years agoPost 3
mustang67ford

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Central Pennsylvania

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Good idea, i'll give that a try.

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06-03-2014 09:02 PM  3 years agoPost 4
ticedoff8

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Morgan Hill, CA. USA

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You need to prime the engine.

I have the YS 56SR & the YS 60SR.

For the 1st start of the day:
* Do not connect the igniter.
* Spin the engine with the starter motor and move the collective / throttle stick form 0 to 100% and back 2 or 3 times while the starter is spinning the motor. Don't move the stick fast, and let it sit at 100% for a second before moving back to 0.
* Make sure the throttle stick is back at 0
* Attach the igniter and spin the motor.
It should start as normal.

This pressurizes the tank and gets fresh fuel into the the carb / motor.

At the last flight of the day, make sure you empty all fuel from the tank (including header) and then start the engine. Let it run until it stops.
If I know it is the last flight of the day, I will hover at 2' or 3' until the motor quits.

I tried the "trick" of pinching the vent tube for the last 1 or 2 ounce of fuel to "build pressure" in the tank - that doesn't work.

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06-03-2014 09:33 PM  3 years agoPost 5
Ace Dude

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USA

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I'll give this a shot as well as my YS60 is the same way. First start of the day seems to take forever, but after that just a quick blip of the started and she fires right up.

  

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06-03-2014 10:45 PM  3 years agoPost 6
airdodger

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Johnston USA

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Need to explain the difference between being pressurized by the engine or pressurizing it by pinching the line. Worked for me for years.

Chris

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06-04-2014 02:31 AM  3 years agoPost 7
ticedoff8

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Morgan Hill, CA. USA

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The YS engines (and some OS engines) have a regulator on the carb that operates only when the crankshaft is turning.

On carbs with built in regulators, without the crankshaft turning, the regulator is not opening and closing to allow fresh fuel into the engine.
This is why you can open the vent line on the tank minutes or days after you fly, and you hear the "whoosh" as the over pressure vents out. The regulator seals the system.

So, the "difference" is you are not getting any fuel through the carb and into the engine just by pressurizing the tank.

No doubt, it puts some unknown amount of pressure in the tank.
And it might or might not have any real affect on engines without regulators.

With a pre-pressurized tank, when you hit it with the starter and the ignitor is connected, you cannot open the throttle to get the fresh fuel into the tank for fear that it might actually start.
While the regulator is opening and closing, the throttle is closed. It can be a long wait for fuel to get into the engine.

So all that pressure in the tank is not helping until you spin the engine.
The spinning engine provides the fresh air to pressurize the tank.
And, you can open the throttle to get fresh fuel into the engine quicker without worrying about starting at WFO.

Fresh fuel inside the engine is kind of the point of priming.

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06-04-2014 09:47 PM  3 years agoPost 8
airdodger

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Johnston USA

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The engine pressurizes the tank on the down stroke, if fuel is already present at the regulator the engine does not care how it got there. So the instant you open the throttle while spinning the starter fuel is drawn into the engine. Fear the engine might start, thought that was the point. Fresh fuel is not the point atomized mixture is necessary to ignite, that is the purpose of a carb.

Chris

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06-08-2014 12:32 AM  3 years agoPost 9
Rob43

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Midland, MI USA

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I've had the same troubles. I had this difficulty today, in fact. I can see that all my engines need a good healthy prime to get going...

I don't have a normal curve to stroke the carb open...so, I flip into idle-up. Vbar then begins to stroke the carb open in attempt to get target speed. I spin the engine to prime it at this time. Then, I flip back to HOLD, and hit the glow. It normally starts great once I do that...just like the others said on priming.

Rob

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HelicopterEngines Plugs Mufflers Fuel › YS56SR hard starting
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