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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 50sx Hyper
08-06-2012 06:35 PM  6 years agoPost 1
WullieTheDon

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Aberdeenshire, Bonnie Scotland

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Can anyone advise me what the setting is on the low end needle for an OS 50SX Hyper.
It is factory set and I was having problems with my engine and usually I would screw a needle in to count the turn for resetting and I didn't this time.
I'm not sure if you screw it all the way in then back it off until it is vertical with the carb or it is screwed out so many turn.
I am okay with the main needle.
Everything I have read on the OS site or manual all say it is factory set but no indication of roughly what that is.

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08-06-2012 08:15 PM  6 years agoPost 2
bart2546

rrVeteran

Canal Winchester, OH - USA

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Per page 13 of the OS 50 SXH manual, when you are FIRST running the motor you should have the needle valve approximately 2 full turns out from closed. So I would go about 1 and 3/4 turns out. It will be sloppy rich but then you can tune in from there.

So you want to turn the needle clockwise until it's all the way closed (the needle stops turning) then mark that position with something (usually the little metal piece that allows the thumb screw to "click" ) and then turn it counter clockwise to open it. It may help you to mark one side of the slot on the screw head with a marker or something so you know which side is which while turning.

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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08-06-2012 09:00 PM  6 years agoPost 3
WullieTheDon

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Aberdeenshire, Bonnie Scotland

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It's the low speed needle that I am speaking about.
The manual only speaks about the needle you refer to which is Needle Valve and I am okay with.
Thanks for taking the time to post anyway.
Maybe I should call it Mixture Control Screw as per page 13 is the one that I require info on.

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08-06-2012 11:32 PM  6 years agoPost 4
punkin71

rrApprentice

illinois

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If you are talking about the slotted screw that is the low adjustment. It will only screw a half-turn in either direction. For the most part you want to leave that at the factory setting, not much more than a millimeter or 2 either way is usually the most adjustment that will ever need. The twist knob is your high needle. My 50 hyper is currently set @ 1.75 plus 2 clicks, flew great yesterday with low screw at factory setting.

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08-07-2012 01:51 AM  6 years agoPost 5
bart2546

rrVeteran

Canal Winchester, OH - USA

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Ok sorry about that confusion. Yes if you're referring to the small and hard to turn screw that's not sticking out, that should really be left VERY close if not AT factory settings. For the needle that sticks out, that should be the 2 turns out give or take.

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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08-07-2012 02:09 AM  6 years agoPost 6
steve 01

rrProfessor

Grand Rapids MI

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parralel with the skids

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08-07-2012 04:24 AM  6 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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The "low end needle" isn't a needle. It is a cam that moves a small brass plate left and right a small amount. It does not screw in or out to effect a change in the low speed setting.

As it is a cam, it is good for ONLY a quarter of a turn left or right from the factory setting. No more. If you go past a quarter of a turn, all you're accomplishing is reversing the direction it needs to turn to make the adjustment. You're also risking breaking something that won't be too cheap to fix.

There is a hex screw with a ring cut into it, that is responsible for retaining the brass plate in the carb. The brass plate rides in the ring cut into this screw. It has no screwdriver slot in it. Leave that screw alone unless you are trying to remove the brass plate/low speed adjustment mechanism for cleaning.

The factory setting for the low speed adjustment is for the screw slot to be parallel to a line running down the center of the carburetor venturi. The cam also needs to be turned such that when you turn the screw slot CLOCKWISE, the brass plate also pivots clockwise. The pivot point of the cam needs to be between the between bulk of the the cam body and the crankshaft (not with the bulk of the cam below the pivot point and closest to the crankshaft).

With the low speed cam properly positioned and at factory setting, turning it clockwise will lean out the low end. Turning it counter clockwise will richen the low end.

When you adjust it, turn it only a small amount each time, then check the result of the adjustment. Do NOT go past 1/4 turn either CW or CCW. I've found that the factory settings for the carb are always a bit on the rich side.

Pages 16, 17, and 18 of the operator manual clearly explain the operation of the low speed adjustment, it's setting, and the fact that it should not be turned more than a quarter turn either way from the factory setting. Also on those pages is the fact that the factory setting for the main needle is open 1.5 turns.

The final setting for BOTH adjustments is wholly dependent upon the fuel you are using, the muffler you're using, and where you live.

Start with the factory settings on both adjustments. The operator manual also has a pretty good flowchart dealing with how to adjust the carb, and what to look for.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-07-2012 05:22 PM  6 years agoPost 8
WullieTheDon

rrNovice

Aberdeenshire, Bonnie Scotland

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Thanks for the replies.
I had taken out the cam screw and didn't know how far to screw it back in. I have now screwed it back in as far as it will go and then backed it out to allow me to make a 1/4 turn in either direction without hitting the stop of the screw. This is allowing the cam to operate in the correct manner i.e turn the screw clockwise the plate moves clockwise.
I also lined up the cam inside to it's retaining slot before finally fitting the screw.
Lesson learned

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