Check that you do indeed have a lean stumble not an over rich condition. Have a friend watch your headers/tailpipes when you floor it,if you have black smoke you'll need to downsize your squirters,if there's no black smoke go ahead and increase your primary squirters by a couple of numbers until the stumble goes away. You may also need to increase your secondary squirters and/or fit the 50cc pumps if you have a lot of manifold and port volume.
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