The 'slurping' noise is the piston sucking air in the intake/blowing through the transfers like normal, just with more liquid in there than normal because you lubed it before installation. I noticed this same thing on my MK80 after I built it.
The 'slurping' noise is the piston sucking air in the intake/blowing through the transfers like normal, just with more liquid in there than normal because you lubed it before installation. I noticed this same thing on my MK80 after I built it.
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