Mercury 75hp 4 stroke 2004

by Joe
(Vancouver, Wa)

Looking at buying my buddies boat C Dory 22 hasn’t run it in years. Cleaned fuel take, replaced all fuel lines and cleaned out carbs. Fired right up but there is a air popping sound with compression. Spray the intake with carb cleaner and smooths out the idle doesn’t change the noise. I’m thinking I unseated an o-ring during assembly which would explain the effects of carb spray but what is the noise? Doesn’t sound like exhaust, sounds just like compressed air escaping with each stroke. Whaddayathink?

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