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knocking

  1. D

    2010 AR210 motor is making a knocking sound

    My 2010 AR 210 Yamaha jet boat port side motor started making a knocking sound. The sound is only detected while idling and at low RPMs. At higher RPMs, it seems to run fine. Sometimes while idling, the RPMs are affected by the knocking, as indicated on the RPM gauge. Last year I took it out...
  2. Gator6

    Engine not starting, knocking

    cou2006 Yamaha SX210 (the previous owner thought it was an AR). I bought it back in June from a guy I worked with and completely trust. I spent 5 years operating/working on combat jet boats for the Navy. We live in Key West, so this boat hasn't seen cold weather in years. About the middle of...
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