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Old 09-04-2019, 09:53 AM   #1
CastIronDuke
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Default Super B jet identification?

Hi guys, I picked up a super B the other day and spent the day cleaning it up, I understand that the B use the same jets as the E. This B came with a 72 main jet, no problem so far, however the intermediate jet has 4 marked on it and nothing else, I offered it up to a 295 (the only spare one I have) and itís clearly much smaller? Is this possibly an older version of the same jets?
Is there also a way of ageing the B

Thanks H


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Old 09-04-2019, 10:06 AM   #2
JasonMcElroy
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Default Re: Super B jet identification?

I've run a bunch of Super B carbs . . . never saw an intermediate jet with any markings other than the actual size. Maybe the larger one you have is a 34 with the 3 rubbed away?

I'd just run with a clearly marked jet of appropriate size to save on fucking around time with an unknown quantity.

In the past I've gotten generic jets (not S&S) that behaved oddly. Am thinking the sizing was not done correctly. I've since insisted on the S&S ones.

What motor and configuration are you running?

Jason
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Old 09-04-2019, 12:46 PM   #3
CastIronDuke
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Default Re: Super B jet identification?

Thank you, Iím putting it on a freshly rebuilt 74Ē Panhead with Truett and Osborne 39t crank, everything is stock and straight through tulips. I was initially going to set it up with a 285 intermediate and a 68 main jet

Cheers H


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Old 09-04-2019, 01:39 PM   #4
Scott McKelvey
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Default Re: Super B jet identification?

Quote:
Originally Posted by CastIronDuke View Post
I picked up a super B the other day however the intermediate jet has 4 marked on it and nothing else
i've run across the exact same thing. I never inquired, but my guess is S&S had a finite number of jets and just called them 1, 2, 3, 4, etc. I suppose you could ask, but I didn't care enough and it was easier\faster\cheaper just to buy a couple of new jets than to play the guessing game. so I agree with Jason 100%.

And yes, Super B, E, G all share the same jets.

You've probably already checked, but if it's a B and it's that old, check for slop in the throttle shaft and the body. If it's sloppy, you'll always be chasing air\fuel mixture problems. Then you either have to machine it for bushings, or hang it on the wall.
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Old 09-04-2019, 02:15 PM   #5
CastIronDuke
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Default Re: Super B jet identification?

Quote:
Originally Posted by Scott McKelvey View Post
i've run across the exact same thing. I never inquired, but my guess is S&S had a finite number of jets and just called them 1, 2, 3, 4, etc. I suppose you could ask, but I didn't care enough and it was easier\faster\cheaper just to buy a couple of new jets than to play the guessing game. so I agree with Jason 100%.

And yes, Super B, E, G all share the same jets.

You've probably already checked, but if it's a B and it's that old, check for slop in the throttle shaft and the body. If it's sloppy, you'll always be chasing air\fuel mixture problems. Then you either have to machine it for bushings, or hang it on the wall.


Thanks for the info. It all appears to be tight,

Cheers H


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Old 09-04-2019, 06:35 PM   #6
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Default Re: Super B jet identification?

If you have mystery jets you can measure their actual hole diameter using a clean number sized drill bit shank (not the fluted end). The largest size that slip fits is your inside diameter or close enough.


I'd buy the right jets. It's not as if they wear out but knowing how to measure jets in general can come in handy. If I drill one I lightly mutilate the number to avoid future confusion.
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Old 09-04-2019, 07:22 PM   #7
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Default Re: Super B jet identification?

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Originally Posted by Scott McKelvey View Post
or hang it on the wall.
After you shoot it.
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Old 09-04-2019, 10:12 PM   #8
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Default Re: Super B jet identification?

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Originally Posted by joe49 View Post
After you shoot it.
Where's the fun in that? The next young guy that comes along, pulls it off the wall, and tries to run it is gonna learn a whole lot about diagnostic work and carb tuning. That's how I learned when I was 22. My Super B was hammered. I rebushed it myself on a drill press ;-0

Quote:
Originally Posted by Scott McKelvey View Post

You've probably already checked, but if it's a B and it's that old, check for slop in the throttle shaft and the body. If it's sloppy, you'll always be chasing air\fuel mixture problems. Then you either have to machine it for bushings, or hang it on the wall.
Listen to this guy. This is not just theoretical. Throttle shafts get sloppy FAST on these carbs for some reason. I have a drawer full of them needing to be redone. Finally decided to start running other carbs.

Jason
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Old 09-05-2019, 04:57 AM   #9
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Default Re: Super B jet identification?

I have a GBL fitted at the moment, however as the engine is fresh built, I want to use a carb I know and is easy to tune, I have another super B however that has a super bowl conversation so want to avoid putting that on my chop.


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Old 09-05-2019, 04:58 AM   #10
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Old 09-05-2019, 04:58 AM   #11
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Old 09-05-2019, 04:58 AM   #12
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Old 09-05-2019, 04:59 AM   #13
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Before and after shots


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