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i d start with a 100 on the 24mm Mikuni for a standard 125cc motor. that s what the hondas use with the vertical motor.
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS  + 2007 Zongshen LZX200G + DR400SM
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