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The Secondary air pump(SAP) runs at cold start for about 1-1/2 - 2 minutes (Sounds like small vacuum)
If your high pitch sound is during that and goes away when pump stops, indications are bearings in SAP are dry (They can be re-greased)
Obviously if the sound is not associated with SAP then check previous posters suggested components
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2002 S - old school third pedal
Seal Grey
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