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Message: [QUOTE="thirtyfour, post: 986489, member: 47860"] the bike is a 01 KX 250 the bike already has a smaller (155 main ) and smaller (48) pilot jet, yet it is fouling plugs like crazy. I am suspecting that the cab flat may not be set correctly. with the bowl removed if I turn the carb upside down the float is NOT level with the housing, it sits deeper. my question about setting the float, the fuel shut off valve seems to have a smaller valve or some rod/plunger inside(about the size of a wrist pin bearing needle), may be used for dampening the float action.? Do you set the float level with this smaller rod pushed in, or its normal (sticking out) position? also my previous KX had a white plastic piece placed over the main / pilot jet area , tis carb does not have such thing.. what would be its purpose? thanks for your help. [/QUOTE]