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jetting or accelerator pump

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I have a 2007 yz450f, runs like a champ... but at low rpm if i jump on the on the gas it will stall out for a second then jump back to life...? where to start?

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AP pump.

Did you confirm you have a strong squirt?

Did you put in a stiffer AP spring like the Merge Racing one?

Did you check and set the AP timing EXACTLY per the manual?

What size leak jet? #60 or smaller?

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