humming sound from L1 an M1

Are they new or been in the system for a while? Usually a good cleaning will quiet pumps down
 
Cleaned so many times . does abyzz a200 have that humming sound ?
 
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IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

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  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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