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YFZ 450 Carbs & Throttle Bodies The YFZ are equiped from factory with very good carbs. However once you modify the engine they become a restriction. To open up this restriction we offer boring the carbs from the factor 39mm FCR's. By boring the carb it provides a dramatic increase in mid range and top end power, and also increases over rev power. This is a must have for any built motor, and the great part is you retain all the great feautres of the FCR carb. Pricing
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