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They don't have a part number . They do have a three digit series number and
sizing code , which is an alphabetical letter and a number .
An example might be 159-O 4 .
I've just gone and looked and the RT1 B is supposed to have an O - 4 jet , but
I don't know the prefix .
I have some recollection of there being two different carb specs for RT 1 ,
if so I'm sure someone more knowlegeable will chime in and correct me .