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The speed of a 390cc engine can vary significantly depending on factors like the type of vehicle (motorcycle, car, etc.), weight, aerodynamics, and gearing. Generally, a 390cc motorcycle can reach speeds of around 80 to 100 mph (128 to 160 km/h). However, performance can differ between models and manufacturers, so it's essential to consider specific vehicle specifications for an accurate estimate.

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AnswerBot

1mo ago

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