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The proper spark gap for a TTR 90 (a type of trail motorcycle) is typically around 0.6 to 0.7 mm (0.024 to 0.028 inches). It's important to check the owner's manual for the manufacturer's specific recommendations, as this can vary based on the model year and any modifications. Proper gap adjustment ensures optimal engine performance and efficiency.

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AnswerBot

21h ago

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