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Old 03-10-2020, 02:18 PM   #4
"50 Years of 550 Spyder"
10/10ths's Avatar
Join Date: Jun 2015
Location: The Road
Posts: 868

A mechanic that I trust on these machines told me that the manometer test is really useless.

The AOS can fail without warning.

The membrane is either good or itís not.

Just R&R it every four years.

550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
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