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My mistake for thinking you had a 912, hence the Solexs. I had and solved a similar problem with my 67S in autocross situations, but it was not heat or time related.It may not be so much heat related as it is time on track related. Your in tank filter may be partially clogged which gets worse the longer its driven hard. Which is why a short rest stop lets the engine work well again for a short time.
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