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Discussion Starter #1
My little 150cc is fitted with a Dell-Orto type MA-18-B carburetor fitted with a number 90 main jet. the carb and it's jet were in the box of parts as I acquired the bike, so no guarantee they are the right ones. 90 seems to me a bit on the large size, especially as the plug is coming a bit on the black side. Anyone know what size it should be? Knowing the correct spark plug would also help. Thanks
 
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