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Question about Mikuni BS34SS differences in bodies

  • Thread starter Thread starter planetcaravan03
  • Start date Start date
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planetcaravan03

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On the Mikuni Bs34ss carbs, are the actual bodies(no jets, needles, ect.) all the same? I need to replace a body and have one other set of Bs34ss carbs but the "ink" stamped number has been removed. I have looked here http://members.dslextreme.com/users/bikecliff/images/carbspec_float_height.html#A01 and it seems that everything is basically the same(aside from the jet sizes, needles ect.) except the starter jets. Mine calls for #50 all the others call for #32.5. If someone could also tell me what the " starter jet" is, that would be wonderful too.
The bike I am working with is an 83 GS1100gl the factory carbs are #49400.
Thanks,
Paul G.
 
Each carb has subtle differences.

#1 has a cover on the left side, because there is no shaft that continues to another carb.
#2 has the vacuum port for the petcock.
#3 has the pulley to which the cable connects.
#4 has a cover on the right side, because there is no shaft that continues to another carb.

OK, the actual bodies might be the same (except for #2's vacuum port), but it's not all that practical to change the throttle shaft linkages, which are the main difference.

.
 
Ok Thanks Steve. I knew each body has a specific place, I will be replacing the #1 carb with another #1 carb body. I will make certain that the throttle shaft linkages are the same. If they are not well, I will figure something different out.
You don't happen to know what the "starter jet" is?
Thanks,
Paul G.
P.s. Thank you for the valve spreadsheet. It is quite the useful tool.
Steve said:
Each carb has subtle differences.

#1 has a cover on the left side, because there is no shaft that continues to another carb.
#2 has the vacuum port for the petcock.
#3 has the pulley to which the cable connects.
#4 has a cover on the right side, because there is no shaft that continues to another carb.

OK, the actual bodies might be the same (except for #2's vacuum port), but it's not all that practical to change the throttle shaft linkages, which are the main difference.

.
Click to expand...
 
The only thing that I can think of that would qualify as a "starter" jet would be the post that sticks down into the edge of the float bowl, but it's not really a "jet", it just has a couple of holes in it. On some carbs, there is a restriction in the port in the float bowl, that might be the "jet", but I have never seen one come out, nor have I seen any numbers associated with it.
 
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