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HelicopterEngines Plugs Mufflers Fuel › Please help identify this carb
12-21-2003 01:18 AM  13 years agoPost 1
MPDano

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San Diego. CA

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I need your help again Runryder members. I have an OS .61 SF and need help in identifying this carb and default needle adjustments. I asume the screw in the center of throttle arm is the low and the high is on the other side. Can someone help please.

Leo Dano

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12-21-2003 01:32 AM  13 years agoPost 2
MPDano

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San Diego. CA

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I'm in idiot. Should have done more research on my own. I found it. Its an O.S. Carburetor #6B .61 SFN-H

Found it on the OS Engines discontinued models webpage. Anyone know the default needle settings (low and high)??

Leo Dano

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12-21-2003 04:39 PM  13 years agoPost 3
Maxx

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Shreveport Louisana

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If I recall the settings were something like bottom needle out three turns from fully closed and the same for the main needle. Assuming the motor has been run in the heli it's installed in I would maybe go 1/2 turn rich on the low speed and the three turns open on the high and fire it up! After it warms up remove the glow igniter and check the idle for rich or lean condition.
When I ran these motors I always removed the OS carbs (6B, 7B,7H) and replaced it with an Supertigre 61 plank motor carb...the OS carbs weren't the best at mid-range mixture control, there always seemed to be a lean spot at mid-range (hover). I also put the three needle carb from the OS61SXH on the 61SFN...it ran great!
The 61 SFN was one of the finest 61 sized motors out there in the early 90's...simple tho use and very reliable.

Chris

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12-21-2003 05:02 PM  13 years agoPost 4
MPDano

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San Diego. CA

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Thanks Maxx, I will try these settings after I charge my starter. Tried my OS .61 SX settings before my starter gave up. I will try 3 and 3. Yes, this is a used engine I bought with an old X-Cell. I am wanting to revive her. Compresion isn't all that great, but I think its enough to start and see what I've got.

Leo Dano

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12-21-2003 07:48 PM  13 years agoPost 5
MPDano

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San Diego. CA

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Okay, got her running. I used 3-1/2 on low and around 3 for high. This is good till I get the gyro to work right. The engine sounds ok for now.

Leo Dano

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HelicopterEngines Plugs Mufflers Fuel › Please help identify this carb
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