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Message: [QUOTE="2strokerfun, post: 1397084, member: 69719"] If it consistently does this only after it runs about 15 minutes, good when cools down until it heats up again, then I'm thinking it is a heat-related air leak. Could be case mating, base gasket, head, or something slightly of true so that it only shows up when engine is warm. I don't have an answer, just a theory... But I'd start with rechecking all torque on case screws, cylinder nuts, head bolts, and reed cage bolts. [/QUOTE]