stock puch carbs..what do the numbers mean

Andrew G /
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My 78 magnum mkII has a 1/12/306. I don't see this one listed on the wiki (http://www.mopedarmy.com/wiki/Bing).

Obviousl its 12mm but what do the other numbers mean? Mine had a 48 jet in which i am assuming is stock. Does this mean 1.5hp model? Thanks

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