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is rejetting required

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hello i am just getting into dirtbikes. i have an 07 yz250f and my buddy has an extra exhaust (it is a yoshimura rs-2) that he would be willing to sell to me. i was wondering if rejetting the carb is required when you install a new exhaust and if it is was size carb jets should i get

thanks

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Yes, you will probably need to rejet. Please post your carb jet info (see the sticky), and read the pilot tuning sticky in the jetting forum page 1.

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