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post #54 of (permalink) Old 08-22-2014, 06:22 AM
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A 45 has a smaller fuel orifice than a 50 but that does not necessarily make it leaner (the two digit number is the diameter of the orifice; a 45 is 0.45mm, 50 is 0.50mm, etc). The other part of the equation is the 'f' number. This designates the number of and the diameter of the air bleeds. Thing is, the f numbers are not in any particular order according to size so one needs to look at a chart of Weber idle jets.


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