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Info on the OS #72 Carburetor

Old 11-20-2008, 03:46 PM
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rainedave
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Default Info on the OS #72 Carburetor

Hi all. What engine(s) came with the #72 carb?

It seems like an OK carb, except you have to remove the barrel to adjust the low speed sleeve.[sm=bananahead.gif]

Thanks,
David
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Old 12-01-2008, 03:29 AM
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speedair
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Default RE: Info on the OS #72 Carburetor

I have never seen thistype of carb before and dont know why you would have to remove the barrel to adjust the idle. Could you take a picture from the throttle side of the engine?
Old 12-01-2008, 09:54 AM
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Waco Driver
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Default RE: Info on the OS #72 Carburetor

This carb came with the 1972 version of the OS 60FGP, the original Goldhead. The idle mixture was adjusted by replacing the idle mix jet with one of the 3 jets which were supplied with the carb. #2 was lean, #3 was standard and #4 was rich. I will send you a copy of the carb instruction sheet if you send me your email.
Old 12-01-2008, 10:19 AM
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Default RE: Info on the OS #72 Carburetor

Thanks Waco Driver! PM sent.

Well, mine has the #3 low speed mixture part.

However, there is a set screw in the barrel and the mixture sleeve can be rotated to fine tune the setting. I rotated the sleeve so that it almost seals off the spray bar when the throttle is set to low idle. I used the method of blowing through a piece of fuel tubing and adjusting the sleeve until air would barely pass through the spray bar with the barrel slightly open. I have not tested this carb on an engine yet.

David
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Old 12-01-2008, 01:00 PM
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Waco Driver
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Default RE: Info on the OS #72 Carburetor

Dave......My message was not deliverable to the email address you provided. Do you have an alternate?
Old 12-01-2008, 01:05 PM
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rainedave
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Default RE: Info on the OS #72 Carburetor

I sent you another email address. Hope it works.

Thanks,
David
Old 01-27-2012, 06:01 AM
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flyboyp51
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Default RE: Info on the OS #72 Carburetor

THANK YOU for commenting on my much needed part(s) for my OS Carb. My OS MAX-H 60 has the EXACT carb pictured...even has the No. 3 carb insert.
IS THERE ANYONE OUT THERE WHO CAN PROVIDE ME WITH JUST THE Needle and the threaded brass tube that houses the needle and threads into the body of the carb?????????? Anyone one have the Carb needle valve assembly?
Old 03-30-2012, 02:21 PM
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Default RE: Info on the OS #72 Carburetor

I have what i believe to be an os 60 fsr with one of thes carburetors, when i flick the throttle from idle to full it will burble then go up or sometimes just cut out. If i slowly advanve the throttle (not too slowly though) it will go up fine. I have adjusted he high end needle but how do i adjust the low end?
Old 05-27-2012, 10:13 PM
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Default RE: Info on the OS #72 Carburetor

Well ive got an os 7b carby here but am waiting fit the idle stop screw to turn up. They apparently had a problem of the idle stop screw breaking and entering the carb jamming the throttle[X(]!!!!!!!!
Old 11-26-2014, 10:29 AM
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If you are still online, I'd like to get a copy

[email protected]
Thanks, Bill
Old 03-23-2020, 07:09 AM
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RichardGee
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Geez! What was O.S. thinking? I have this carburetor on my Max H.60 goldhead. The engine loads up badly at idle such that advancing the throttle after prolonged idle causes coughing, spitting, and often kills the engine.
It is obviously WAY too rich at low speed, but NO external adjustment! Crazy!
Mine has the #3 sleeve installed and as I bought the engine used with no box, there are no other low speed sleeves included.
I will try the fine adjustment of rotating the sleeve after carb disassembly...
My guess is, way back in the 70's in a Japanese pub... some O.S. designer had a bit too much Saki, chose this carburetor for a production run of about 4 engines, sobered up, and offered a conventional adjustable carburetor on engine #5.
I got engine #4
Old 03-23-2020, 10:18 AM
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Originally Posted by rainedave View Post
Thanks Waco Driver! PM sent.

Well, mine has the #3 low speed mixture part.

However, there is a set screw in the barrel and the mixture sleeve can be rotated to fine tune the setting. I rotated the sleeve so that it almost seals off the spray bar when the throttle is set to low idle. I used the method of blowing through a piece of fuel tubing and adjusting the sleeve until air would barely pass through the spray bar with the barrel slightly open. I have not tested this carb on an engine yet.

David
I don't find there is any ability to "rotate" this sleeve.
The set screw that holds the low speed sleeve in place allows for NO wiggle room... it simply locks the sleeve in one place.
What a CRAZY O.S. carb design!

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