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I have the original 145 main jet from my 05 220. I also have a 152, 155, 158, and 160. My eyes can't see a difference in the bore size of the jets. They all look the same diameter internally. Just out of curiosity, is there a chart that lists the bore sizes of main jets?

If I`m not wrong (there is a huge possibility I am) the jet numbers are actually the bore sizes. I think 145 is 1.45mm, 152 is 1.52mm and so on.