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Yamaha TY250 Mono Carb upgrade

ady witting

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I have a TY250 mono with a pro monty front pipe and sammy miller back box and rebored to 261cc with wossner piston, just wondering if there is a carb upgrade from the original as can not get it to run right always running on when it gets hot tried cleaning carb out I have left jetting as it was. 

If there is a carb upgrade where to buy one from 

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