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    Default Knocking / rattle sound in 40hp outboard - Lower leg?

    Just checked spark and compression this afternoon. All 3 cylinders have spark and compression is ~100psi on all three cylinders Already checked the gear oil and changed it, nothing of significance to report. Sorry for the late reply, working full time now and super busy Cheers
  2. Z

    Default Knocking / rattle sound in 40hp outboard - Lower leg?

    "Default" is not supposed to be in the title Any ideas anyone?
  3. Z

    Default Knocking / rattle sound in 40hp outboard - Lower leg?

    Hi, I have this old 1993 40hp 2-stroke Yamaha. It has been sitting on an outboard stand for a couple months. Started it up on the weekend and it was making a horrible knocking sound which gets worse at lower idle (see videos 1 and 2). When it was on the boat I bought I don't remember it having...
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