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  #11  
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Nitro57xl Nitro57xl is offline
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On an original jet the tube has a slight outside taper on the bottom, it is pinched for the metering part of the tube about 3/8" up from the bottom. The tube is drilled from the bottom and gas flows through the tube. No sideholes like the later jets you have pictured.
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OK, I had to search through ABCgang listings (thanks, Monte03!) and found a pic:




So the intermediate jet is drilled throught from top to bottom and there are no more holes in it? And the hole diameter should be .029" if I want to make an .029 jet? What is the purpose of a pinch? Is located on the same level as intermediate passage plug (#11 from the S&S catalog)?
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No more holes. The purpose of the pinch is to provide material to drill out for the metering orifice and should end up above the passage level because the passage provides the gas for the jet. The small marks on the side were a crude way of telling what size the jet was?. It should be pointed out that these carbs were more or less homemade as S&S was a small company then and nobody knew how these would sell or how big the market would become? This was really the first aftermarket carb made especially for a Harley. Any others were adapted from cars Like the SU or weber?
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Quote:
Originally Posted by Nitro57xl View Post
No more holes. The purpose of the pinch is to provide material to drill out for the metering orifice and should end up above the passage level because the passage provides the gas for the jet. The small marks on the side were a crude way of telling what size the jet was?. It should be pointed out that these carbs were more or less homemade as S&S was a small company then and nobody knew how these would sell or how big the market would become? This was really the first aftermarket carb made especially for a Harley. Any others were adapted from cars Like the SU or weber?
Thank you!
Took a closer look at it. The thread size for the intermediate jet and plug is 1/4-20. The thread size for the intermediate air bleed is 5/16-24. That means that a main jet for S&S Super E/G could be used instead of the intermediate air bleed, since they got the same thread size and modern mains are also available in .058 or .060 size.

That's all for the good news, now a not so good one for me - the GAL float bowl screw pattern is not the same as GB - the top right hole on GB is offset to the left, so it won't interfere with the intermediate jet hole.

Guess this is going to be a long project - I don't want to drill the carb body or the float bowl, so hopefully I will be able to fish out the correct bowl from ebay over time. Catalog says there're two types of bowls - a gas one and a fuel one. Is there any way to identify them?
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The fuel float bowl has a much bigger thread for the huge needle & seat required to run nitro! Otherwise the float bowls were the same. Yes, you could run a super e main jet for an air bleed! A fabricator could make a float bowl? Not like brain surgery? Floats are impossible to find for these carbs. S&S bought floats from a car carburetor company and used levers from a model m linkert soldered on. Nobody knows for sure which carbs used those floats? Some think 6 cylinder Ford from the 60's?
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Quote:
Originally Posted by Nitro57xl View Post
The fuel float bowl has a much bigger thread for the huge needle & seat required to run nitro! Otherwise the float bowls were the same. Yes, you could run a super e main jet for an air bleed! A fabricator could make a float bowl? Not like brain surgery? Floats are impossible to find for these carbs. S&S bought floats from a car carburetor company and used levers from a model m linkert soldered on. Nobody knows for sure which carbs used those floats? Some think 6 cylinder Ford from the 60's?
Well, on the other hand I could try to make a spacer, use a countersunk screw to mount it to the top right carb body hole, use 3 longer bolts and drill and tap the spacer for the 4th hole. Now wait, when I bought my GAL 2 years ago it did come with about 1/4" thick spacer. I'll have to take a closer look at it.
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great Info NITRO, I Cannot Post Pictures but it was the Great Leo Payne that Assisted George Smith Senior to Develope those First Gen G, GB, F carbs, they used a Sidebowl Linkert as their Test Bed Guinnea Pig Carb.. all Great Stuff 'And I Love These Carbs, Also have a GBL on my 69 XLCH, it just works great
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This may not help much but I've been gathering info on the Early S&S carbs in the Sportsterpedia REf section.
I've brought Dr Dicks history information here plus some pics.
http://sportsterpedia.com/doku.php/techtalk:ref:carb01v
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Some dimensions on the intermediate jet. Overall length is 2.520". Length of the 1/4-20 set screw part is .475". When screwed all the way into the carb the top of the jet is .720" down from the top of the hole. I noticed that the little screw that plugs the cross drilled hole needs to be short enough that it doesn't block the vertical hole that the intermediate jet is in.

The ID of the brass tube used to make the jet is too big and that is why it's pinched down so that a smaller hole can be drilled into it.

But I can't think of any reason that the metering hole couldn't be drilled in the set screw end, using a larger drill through most of it and then finishing with the small drill through the last small distance. The later carbs have the small holes near the top of the tube and it works for them.

If you can't find any 1/8 brass tube you could cut up one of the later jets you have. Finding a 1/4-20 socket head set screw in brass would make drilling and soldering easier too.
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Thanks a lot, needspeed!
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