Bing differences

[tomale]

I am curious about the difference between a 54/38/101 and a 54/38/123 I think that there are difference in the jetting as in numbering system but will the new ones work in the older carb? and do I need a conversion chart or something to use the older carb. what about performance, do they perform the same?

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)74'
250 hare scrambler (project bike)