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This sounds like a push rod engine?
If so you should be OK with 0.002" to 0.003" on intake side, and 0.003" to 0.005" on the exhaust side. The extra gap on the hot side is to make sure that heat expansion doesn't close the gap while running. It could lead to escaping exhaust gas (failure to fully close) which can burn the valve seat.
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-NOS 2020 KTM 250SX (2-stroke motocross)
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