OS 61 SF

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Ted - 07 May 2010 21:58 GMT

I have an old OS 61 SF (yes, SF, not FS) and its got the weirdest carb
I have ever seen. I need to adjust the low end idle and haven't a clue
how to do it. I have serached the web but came up empty. Does anyone
out there have one of the these old engines and know how to adjust the
carb?

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Vance Howard - 07 May 2010 22:17 GMT

> I have an old OS 61 SF (yes, SF, not FS) and its got the weirdest carb I
> have ever seen. I need to adjust the low end idle and haven't a clue how
> to do it. I have serached the web but came up empty. Does anyone out
> there have one of the these old engines and know how to adjust the carb?

http://www.osengines.com/manuals/index.html

Is this engine with or without a pump? There are instructions for many of
their carbs and for pre 2000 pumped carbs. There should be a number on
the carb your engine has and then you can look at the manual for that
carb.

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To reply by email: vhoward1122 at gmail dot com

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hsanchez - 26 May 2010 04:23 GMT

> I have an old OS 61 SF (yes, SF, not FS) and its got the weirdest carb
> I have ever seen. I need to adjust the low end idle and haven't a clue
> how to do it. I have serached the web but came up empty. Does anyone
> out there have one of the these old engines and know how to adjust the
> carb?

Good Evening. I happen to have a .61 SF with a 7L carburetor. This
carburetor has a small cam screw on the same side as, and in front of,
the high-speed needle valve. It's been a long time since I've had to
fiddle with this screw, so I don't remember which way is richer or
leaner, but when you turn the screw, it twists a cam below it which
adjusts the idle. Good luck.

Very respectfully,
Harry Sanchez
hsanchez@jetlink.net

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Model Forum / Radio Controlled / Air Models / May 2010

OS 61 SF