All Small Six Weber 32/36 rough idle

This relates to all small sixes
Doesn't change much, but there aren't any studs for the carb. I had to buy bolts and make a washer sandwich to hold the carburetor on. The adapter isnt threaded at all besides that one hole in the middle i don't think I can tighten that enough to warp it. My left arm isn't strong enough to hold it back the bolt if I were to really try and muscle the nut down 😂

They were snug then I gave it a little bit of a turn after that for the lock washer to fully engage. That should have been more than enough to get a better pattern on that gasket but it barely sealed
 
Doesn't change much, but there aren't any studs for the carb. I had to buy bolts and make a washer sandwich to hold the carburetor on. The adapter isnt threaded at all besides that one hole in the middle i don't think I can tighten that enough to warp it. My left arm isn't strong enough to hold it back the bolt if I were to really try and muscle the nut down 😂

They were snug then I gave it a little bit of a turn after that for the lock washer to fully engage. That should have been more than enough to get a better pattern on that gasket but it barely sealed

Oh, wow... That adapter isn't like the one I have. I'm not sure I'd trust that to seal without studs.

20250904_195053.jpg

This is what mine looks like. It came in the Redline kit. It requires almost zero torque to seal up nicely. Yes, that's a nut in my intake. Whoops :ROFLMAO:

IMG_1632.jpeg
 
That adapter looks the same as one I have in a box somewhere, $15 from Amazon or ebay. Generic wide-slot fit for small base Rochester on big six log intake. Not saying it's the same casting, but may be- just has the "look" of coming from the same overseas place.
 
Somethings missing but I cant quite put my finger on it 🤔😂

Fixing the pinhole leak it had while I wait for the carb stuff
 

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I looked everywhere for that adapter and can’t find it at Clifford, Redline or Vintage Inlines. I did find an EBay vendor who has a kit for the 200 with that adapter though and it looks like it needs some kind of threaded inserts and it uses studs: https://www.ebay.com/itm/273885224140

I wonder how square the face of it is. If I was having trouble with the seal, I’d mark the face of that adapter with a sharpie and then get a piece of stone countertop (a shop down the road gives away remnants) and put some 2000 grit on it to see how true it is (by gently wearing the sharpie away with the 2000 grit on the countertop remnant). It would be useful to have the studs and inserts as well.

If you spray carb cleaner around the base while the engine is idling, does it affect the running of the engine?
 
I looked everywhere for that adapter and can’t find it at Clifford, Redline or Vintage Inlines. I did find an EBay vendor who has a kit for the 200 with that adapter though and it looks like it needs some kind of threaded inserts and it uses studs: https://www.ebay.com/itm/273885224140

I wonder how square the face of it is. If I was having trouble with the seal, I’d mark the face of that adapter with a sharpie and then get a piece of stone countertop (a shop down the road gives away remnants) and put some 2000 grit on it to see how true it is (by gently wearing the sharpie away with the 2000 grit on the countertop remnant). It would be useful to have the studs and inserts as well.

If you spray carb cleaner around the base while the engine is idling, does it affect the running of the engine?
No it's doesn't. It doesn't let enough through to do much but obviously it let's in enough air to kill it. If I completely close the choke it idles fine but only at 2.5k rpm.
 
"I looked everywhere for that adapter and can’t find it at Clifford, Redline or Vintage Inlines. I did find an EBay vendor who has a kit for the 200 with that adapter though and it looks like it needs some kind of threaded inserts and it uses studs: https://www.ebay.com/itm/273885224140"

Thats the one i have but there is nowhere to thread said studs. its all smooth on top of that adapter
 

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Also the adapter and carb are flush so its not an issue of either being warped its an issue of the fact that it cant get enough force to clamp them together

Also also the aluminum radiator is coming along nice
 

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"I looked everywhere for that adapter and can’t find it at Clifford, Redline or Vintage Inlines. I did find an EBay vendor who has a kit for the 200 with that adapter though and it looks like it needs some kind of threaded inserts and it uses studs: https://www.ebay.com/itm/273885224140"

Thats the one i have but there is nowhere to thread said studs. its all smooth on top of that adapter
Is this what you are looking for?

 
No it's doesn't. It doesn't let enough through to do much but obviously it let's in enough air to kill it. If I completely close the choke it idles fine but only at 2.5k rpm.
Man, it still seems clear there is a significant vacuum/ air leak somewhere in your system. A carb gasket will not bleed enough air to cause this extreme leanness.
Remove and plug all vacuum lines. Spray brake clean around the ports/ intake-to-head gasket.

The original symptom which led to a carb swap has not been resolved.
 
Frank… this vacuum leak episode is different than the original carb issue. You’re not looking close enough. If you spend enough time to analyze the carburetor base, adapter and gasket you will clearly see that the gasket is not sealing around the slotted holes. I studied it in depth and I am shocked that Weber signed off stating that the adapter design is good. It’s not. A matter of fact I don’t think I’ve ever seen such a poorly designed adapter from a manufacturer.

Below is a picture of the gasket with highlights to show where it’s leaking.
IMG_0455.jpeg

Another thing, it would be best to have gaskets without the slotted holes and the notch.

Below is a pictures of the carb base and adapter with highlights . Look at the gasket, then carburetor base and adapter carefully and it clearly shows why the carb is not able to seal properly.

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I cannot be conclusive from a photo. Ican see there could be issues with an elongated hole. But I also see impressions in the gasket in the areas of the elongated holes. If the gasket is sealed around the throat, it wouldn’t matter if the mounting holes were sealed.
Or am I missing something?🤔
 
Sorry my photos didn’t get attached, but they are basicly the same as yours. In all the closeups, I see impressions from sealing around the throat
 
IMG_0455.jpeg
If your phone laptop or monitor doesn’t have good resolution, it might be hard to see what I’m pointing out. I’m doing everything on my cell phone and it has better resolution than most monitors or laptops.
 
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