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Sounds like a fuel heat issue. Fuel getting so hot in the bowls that it changes the mixture when it goes to emulsify. I do not have any further solution for that issue. I see it on 512 Boxer Ferrari's, the ones that are rarely driven hard that is. Try bumping the main jet size by one or reduce the air corrector size a couple sizes. Not sure if you have hooked up a wide band to it or not but they are very helpful
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