Fran, I have a MS TSX-245, you a 600. However, there are only some subtle differences. Setting the float [correctly and evenly] can make all the difference in the world. Make sure your float is set at the proper level @ both the front and back of the air-bladders. Mine is set to "1/4". See the enclosed link: >Link This>Link is an article from YT on rebuilding a carb. It shows you how to set the float [only the part near the pin, set both ends of the bladder to your specified requirement]. Make sure when you put the top and bowl back together that you do not bend the float...if it bends, your @#%. Regarding the gasket, a new gasket needs time to absorb gas a swell. Make sure the screws securing the top & bowl are real tight and evenly secured...if it is the gasket, Roberts Carb Repair seems to be the guy...he's in YT somewhere. If you soaked the carb, make sure you either took out before or replaced after, any of the shaft's packings...if those are gone or damaged, gas will leak. good luck, tom
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