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I was having the same issue when I turned the voltage up on mine. Contacted Ray @ NeoTat and he sent me heavier springs for my machines. No more noise and I run my machines 12-13 volts... All the newer machines come with an extra set of heavier springs. Takes 2 minutes to install.
I've been using Neotats for awhile and have a few, A couple of days ago I opened a brand new long stroke original Neotat out of the box and it runs like a chain saw, twice as loud as my other long stroke neos.....All of the machines are lubed the same and this ones really loud but performs great sooooo I dunno :/