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Most ECUs need work when a product comes out of the box. Never yet had a displacement change cause a problem with an ECU, as long as the system could flow enough air and fuel at WOT. Those, then are mechanical failures, not electronic function failures, so the ECU simply can not do it's job, no matter how hard it tries. Since ECUs do nothing more than adjust air:fuel ratio to changing conditions, the ECU actually self adjusts to the conditions changed by the bore change. Carbs, on the other hand, totally lack such capabilities. That is why we have ECUs and not carbs.
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