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2008 yz450f bogs when throttle opens

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I had put on an FMF powerbomb exhaust system and changed the main jet from a 160 to a 170, and changed the needle from groove 3 to groove 4. Could this be the problem why when i give my bike a quick twist of the throttle it bogs? Im thinking its too rich. Any ideas?

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As per Krannie it needs more fuel when you give it a quick twist.

 

Might only need the leak jet smaller to sort out.

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