Re: Another Big Twin Observation…. Home › Forum › Ask A Member › Another Big Twin Observation…. › Re: Another Big Twin Observation…. chris-pReplies: 2456Topics: 153 August 9, 2018 at 8:16 pm #80887 Always good to clean those screens while you have it apart as well! As you can see, most are plugged solid. A tune up item often missed by mechanics.