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Home✈️Aircraft🚁HelicopterThunder TigerOther › OS Tuning
01-27-2007 03:30 AM  12 years ago
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myaces

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North Bend, Wa

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OS Tuning
My OS50 on spool up is starting to hessitate a little. I assume that it is a problem between the low and high needle setting. I'm running 2 full turns out on the high needle and the low needle is horizontal. Which one do I need to adjust and in which way, also I know I'm a little rich on the high end but I'm getting good power so I'd prefer not to muck around with that much.
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01-27-2007 03:41 AM  12 years ago
Super D

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Athens TX

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Typically bogging in transition is too rich on the low end. I'd turn the low end IN(clockwise 1 hour).
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01-27-2007 03:47 AM  12 years ago
psych-lick

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Portland, OR

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Hesitate? Need more clarification.
If your idle rpm drops after waiting 15 - 30 seconds and then spits and sputters during throttle up then it is too rich. Close the low end (and or get a hotter plug).
If the idle rpm stays the same for 30 seconds and then sounds hollow and doesn't throttle up cleanly (hesitates) then you are too lean on the low end.

Remember - your low needle also affects mixture to about half throttle. You might have to re-adjust your high end after adjusting your low end.
-Jeff T.
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01-27-2007 03:58 PM  12 years ago
gftazz

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upstate N.Y. in the Adirondacks

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You answered your own question with the high end needle comment.
Horizontal is about perfect on the low end or a smidge more open to the 2 oclock position AFTER you start to lean out your high end needle. You didn't state which muffler or plug and what nitro % fuel but most of these engines run around 1 1/2 - 1 1/4 out on the high end give or take 3-4 clicks of that on the high end needle.

Yours is too rich and now that the engine's ring is fully bedded in she's exhibiting rich symptoms. Go to 1 1/2 on the high needle and start from there to lean it out a couple clicks at a time till she's good for you. Leave the low end alone for now as both of the 50 sized I have are set at just about horizontal on the low end.

DON'T GO ANY LEANER THAN 1 turn out on the high as that is now at the danger zone. I have never had to go in less than 1 turn out on the high needle on any make or size (30-50-60-70-80-90) of the engines I have ever owned.

Tom
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!
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01-27-2007 08:59 PM  12 years ago
TonyTypeS

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New Orleans, LA & El Monte, CA

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myaces
Sounds like you low end mixture is too rich. Mines was doing the same thing on spool up. When I would give throttle it would spool up fine for a second than as I progress to give it more throttle it would spudder/ hesitate to spool up but once I go past 40% throttle the engine would spool up fine. Just lean it out another mm or 2 and you should be fine.
Also a buddy of mines told me to just spool up very slowly. If you give you spool up slowly you will give the engine enough time to burn the extra fuel. If i spool up too fast too much fuel enters the carb and cause it to become very rich.

gftazz
I have the high needle on my hyper 50 less than one full turn from close. But than again I have a pump setup. Engine is still cool and not running hot.
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01-30-2007 03:16 AM  12 years ago
myaces

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North Bend, Wa

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Thanks, it appears it was running a little rich, three clicks in and there is less of a problem on spool up. It's still a little hessitant at the very low end of the throttle but it will spool up I just need to give it a few extra seconds.

I think this started happening when I went from 30% down to 20%, is that typical?
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01-30-2007 04:12 AM  12 years ago
psych-lick

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Portland, OR

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30 down to 20% - sure, thats your problem...
20% needs much less fuel to air mixture for optimal combustion.
-Jeff T.
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01-30-2007 10:49 AM  12 years ago
AnnihilaT

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The Netherlands

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three clicks in and there is less of a problem on spool up. It's still a little hessitant at the very low end of the throttle
Than you only messed with the high-end needle and still havent tuned the low-end where it should be. (You said clicks... the low needle doesnt click.)

You can get rid of that hesitation completely by simply leaning the low needle a tad more. Turn it in 1 hour. Imagine the low needle as the face of a clock and turn it clockwise 1 hour.

Dont be afraid to play a bit with the needles when you know something isnt quite right. You can always put them right back where they were if symptoms get worse and then try in the other direction. Its the only way you gonna learn




A day without sunshine is like, well, night.
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