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First make sure your secondary air pump is working correctly.
It should run for about 90 seconds on a cold startup
It is the Vacuum cleaner sound you hear.
If there is also a high pitch whine when the air pump is running then you maybe hearing the Air pump's Bearing whining due to no grease.
You can take the Air pump apart and re-grease the bearing.
Mine has been Whine free for over 2 years since re-greasing
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2002 S - old school third pedal
Seal Grey
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