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Goodwrench
 Post subject: Carb Question
PostPosted: Thu Feb 01, 2024 1:41 pm 

Joined: Sat May 23, 2020 4:41 am
Posts: 198
Location: Morgantown WV USA
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DSCN6422.JPG
Need some advice from the experts please:
I'm in the final assembly process on my S2A project and noticed the carbs have a female slot in the top of the slide barrel similar to the H1s, however the screw on caps have no male lug to mate up with it. Is this correct? Seems like screwing the flat surface of the cap over this slot would create an air leak.


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Jim
 Post subject: Re: Carb Question
PostPosted: Thu Feb 01, 2024 3:02 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9999
Location: North Central NC
That's normal. I assume that without it, the leak at the cable entry isn't enough to ensure free movement when you lift or lower the slide quickly.

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mraxl
 Post subject: Re: Carb Question
PostPosted: Thu Feb 01, 2024 5:03 pm 
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Location: Dandridge, TN, USA
There should be a gasket fitted in the cap.

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Jim
 Post subject: Re: Carb Question
PostPosted: Thu Feb 01, 2024 5:49 pm 
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mraxl wrote:
There should be a gasket fitted in the cap.


Right, but it can't seal at the notch. I assume that's a controlled leak.

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ThreePipesSmokin
 Post subject: Re: Carb Question
PostPosted: Thu Feb 01, 2024 6:29 pm 
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Joined: Wed Jun 08, 2011 10:28 pm
Posts: 1572
Location: Tampa Bay Florida
Jim wrote:
mraxl wrote:
There should be a gasket fitted in the cap.


Right, but it can't seal at the notch. I assume that's a controlled leak.

It's a Lab Seal! ;)

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Goodwrench
 Post subject: Re: Carb Question
PostPosted: Thu Feb 01, 2024 8:49 pm 

Joined: Sat May 23, 2020 4:41 am
Posts: 198
Location: Morgantown WV USA
Thanks for the replies guys.
I intentionally removed the gasket before I took the photo.
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0120raptor
 Post subject: Re: Carb Question
PostPosted: Fri Feb 02, 2024 11:13 am 

Joined: Fri Oct 13, 2023 5:52 am
Posts: 49
Location: Manchester UK
The slot is at atmospheric pressure so it will never leak air. It`s not under any engine vacuum. You could unscrew the top completely and it won`t make any difference.
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mraxl
 Post subject: Re: Carb Question
PostPosted: Fri Feb 02, 2024 11:23 am 
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0120raptor wrote:
The slot is at atmospheric pressure so it will never leak air. It`s not under any engine vacuum. You could unscrew the top completely and it won`t make any difference.

I disagree! Slot is not a problem but a loose cap will make it rev to the moon. Been there- done that.

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0120raptor
 Post subject: Re: Carb Question
PostPosted: Fri Feb 02, 2024 12:41 pm 

Joined: Fri Oct 13, 2023 5:52 am
Posts: 49
Location: Manchester UK
mraxl wrote:
0120raptor wrote:
The slot is at atmospheric pressure so it will never leak air. It`s not under any engine vacuum. You could unscrew the top completely and it won`t make any difference.

I disagree! Slot is not a problem but a loose cap will make it rev to the moon. Been there- done that.

I`m not suggesting remove the cap and run the engine. I mean you could THERORETICALLY remove the cap and assuming the slides don`t move the engine won`t suck in any more air.
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Jim
 Post subject: Re: Carb Question
PostPosted: Fri Feb 02, 2024 12:58 pm 
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Location: North Central NC
mraxl wrote:
I disagree! Slot is not a problem but a loose cap will make it rev to the moon. Been there- done that.


Is it possible that happened because the loose top sat higher, pulling the cable and and lifting the slide a little?

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