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  #1  
Old 16th September 2019
RKN's Avatar
RKN RKN is offline
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Default Need help with S&S GB carb

I really like the GAL carb that is on my 900 CH engine right now, but I'm almost finished with the version 1.0 of my 5" stroker (waiting for an AXMR capasitor, since I can't get a spark from the one that Morris supplies with their adjustable advance unit while kicking it with spark plugs installed), so GAL will go there.

So I bought S&S GB carb for the 900 on ebay recently, received it today. The price was not too bad, even that it was missing a bottom plug, an intermediate jet and a choke assembly, and the float bowl was from either a GAL or GBL, though the needle seat has internal threads for the gas hose. Here are the pics:







Velocity stack and a float bowl extension(?) that came with it:











L-series float bowl with threaded needle seat:






OK, now the questions:

This screw is supposed to have 8-32 thread size. This particular screw is more like # 10 or # 12 - it fitted the top hole where the intermediate jet is supposed to be, but it's too small for the hole where it belongs. What's its purpose - just a plug? If yes, then it's no big deal.



Here's my collection of GAL intermediate jets. 2 jets that came with the others (on the bottom of the pic) are not GAL jets, they are shorter and have different threads and caps.



I was hoping they would fit the GB carb, but they are too long.



The main jet is #80.







Is there a source for the jets? What are the correct jet sizes for the stock 900 engine?

Also, the bottom plug - does it just serves a plug function or is it also a part of the fuel circuit and can not be substituted with a threaded plug (GAL instruction does say so, but GAL is different).

Here's S&S catalog page:



Any info would be appreciated. I did find few posts by Dr Dick on early carbs history, but can't find anything beyond that. Also, if someone has a choke block, bottom plug and correct jets for sale - pleas PM me.
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  #2  
Old 16th September 2019
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Monte03 Monte03 is offline
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That GB looks like what it was intended for 'Racing', Yes the Main Jet is under that base body Nut, it is Shoulderless while the GBL and GAL have the top hat shape, not interchangeable with your GB, also the GB, GA float bowl has a different bolt pattern than the later GBL, looks like they took care of this with the bowl spacer adapter, I just went thru all of this and you may hit the Lottery before finding an Array of GA, GB jets, my 2 cent opinion? If for the street find a later GBL carb that incorporates the choke and main jets readily available ( edit - what media are you using to post your pictures? thanks )
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Last edited by Monte03; 16th September 2019 at 22:29.. Reason: question
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  #3  
Old 16th September 2019
nibroc nibroc is offline
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in MMHO the GAL is too big of a carb for the stock 900---I have a GAL on my 59 XLCH but it is almost 80 cubic inches
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Old 17th September 2019
Nitro57xl Nitro57xl is offline
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The GB is the smaller version of the original G carb. 1 3/4" venturi compared to 1 7/8"of the G carb. The missing screw on the side is the air bleed for the low speed circuit, usually a .059 hole. Later carbs had a small ball bearing trapped on the inside of the screw to keep it from spitting gas when it was Idling . The intermediate jet was a setscrew with a hole drilled in it and a brass tube soldered on. The brass tube was pinched in a die and a metered hole drilled for the jet. After the jet was installed a plug blocked the hole on the top. The needle seat is from something else, never made by S&S? A hose barb was original. Your going to have to make your own parts, S&S isn't interested in making anything for these anymore? These are a good carb when tuned right. A .029 intermediate jet and .080 mainjet will get you in the ballpark. Some people drilled and tapped the main air bleed on the back of the carb and used Holley main jets to fine tune the air bleed.
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  #5  
Old 17th September 2019
needspeed needspeed is offline
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Hi RKN, I agree with Monte that you'll have an easier time with a later carb due to the fact that parts are hard to find. But if you like a challenge you've got one with this carb.

I've never seen a GB but have seen a few of the larger 1/78 Gs. The casting between the two appears to be the same so the difference is in the machined bore size. So as to the screw size you ask about. The diagram you have can't be right. It can't be a 8-32 screw and at 7/8 would be too long. I have seen one carb with that hole with a 1/4-20 thd and that screw in place with a small hole through the center that served as the intermediate air bleed. As Nitro57xl mentioned the intake air pulsing in and out at idle would make gas spurt out the hole so an air bleed with a check ball was available. That check ball valve had a 5/16-24 thread.

I know of no source for jets but they are easy to make. Thread a 3/8 brass rod with a 3/8-24 die. Cut to the right length, cut screw driver slot and drill a hole through the center. The plug is just that, a plug. A 3/8-24 bolt with a sealing washer will work. Just not so long that it blocks the cross drilled hole coming from the float bowl.

Seems like your first task is to find a way to add a choke. Without an accelerator pump you'll need one.

I wonder if a choke assembly from a Linkert DC could be fitted.
Late model air cleaner back plates don't fit this carb.
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Old 17th September 2019
Nitro57xl Nitro57xl is offline
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I agree with need speed on everything. As far as a choke I know of one guy who rode one on the street for years with a homemade air cleaner and he carried a toothpick that he stuck down the floatbowl vent to depress the float and flood the carb like an amal carb on a British bike. The air cleaner bolt pattern is unique to the G carb. A dc carb choke won't fit these carbs, just about everything is wrong. Something looks modified in the picture of the front side of the carb around the intermediate air bleed hole? I still have one of these carbs I bought new 50 years ago. Damn I'm getting old?
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Old 17th September 2019
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On Ebay a Seller with the handle ( ABCgang ) Rich, Restores many old Side Bowl Carbs, Do a Search, he may have the Choke adapter
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Old 17th September 2019
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Monte03 Monte03 is offline
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RKN search Ebay #283290668433 it shows a Carb with Choke Adaptor
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Old 17th September 2019
Iron Mike Iron Mike is offline
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For what its worth, Im not aware of market prices on these.
https://phoenix.craigslist.org/evl/m...974230553.html
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Old 17th September 2019
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Nitro57xl, needspeed, THANK YOU VERY MUCH for your priceless info! Yes, I like challenges and I'm on a budjet, but I do like the vintage performance parts.

I will try to make an intermediate jet. Should the tube be drilled on the bottom also, besides on top? Shoud the bottom end of the tube be plugged? Or maybe there're pics of those jets somewhere?

Monte03, yes, I also found that link and will probably make a drawing for a machinist to make my own. I'm using radikal.ru photo host.

Iron Mick, that's IMO a good price for a GBL that looks to be complete. I paid $150 for the GB, don't think that machining a choke adaptor and making an intermediate jet would cost me over $100 here in Russia. We still have enthusiasts with non-CNC lathes and mills that like what they are doing and are not about money.
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