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Technically speaking, the concept of "engine aging" doesn't exist and makes no sense, but it intuitively (but generically and imprecisely) describes a real phenomenon. We're talking about the type of (not necessarily positive) engine evolution that isn't tied to its operating hours, nor to the maintenance intervals prescribed by engine manufacturers, nor to product obsolescence. It's a decline in engine performance that can occur even when all components are within their correct operating time windows. It's possible to compare two engines with the same technical base, equivalent components, and identical maintenance intervals, yet in practice they exhibit different performance. Or, given the same operating hours, one engine may exhibit negative functional and aesthetic variations compared to the other, without being able to precisely identify the causes.
These are changes that have effects that the kart driver perceives through specific "symptoms" that are perceived precisely during use of the engine. These anomalous behaviors are not necessarily attributable to malfunctions of out-of-tolerance components or to missed maintenance, but rather to a variation in the way the engine works as a whole. The result is a unit that, while falling within theoretical and performance parameters, exhibits variable and not immediately explainable operating conditions. It is in this discrepancy—often perceptible before it can be measured with specific instruments or checks—between the (apparently optimal) technical state and the practical (altered compared to expectations) behavior that the phenomenon we, for simplicity, call "aging" takes shape.