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  1. 04-23-2018, 10:39 AM #1
    Basscat528
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    Yamaha pro v 150 knocking

    I have a 1989 yamaha pro v 150 that until a couple trips ago started to rattle like a wrist pin noise. Had the engine rebuilt and still having the same noise. It seems to be knocking in gear and not in neutral. Carbs have been rebuilt 3 months ago. engine runs great except for the knocking. Any ideas?
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  2. 1Holeshot
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    #2 04-23-2018, 03:27 PM
    If only knocking in gear, it could be a lower unit problem.
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  3. Brianmoore25
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    #3 04-24-2018, 08:44 AM
    If you give it a small amount of throttle does it go away or does it knock through the whole RPM range?
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  4. Basscat528
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    #4 04-24-2018, 11:00 AM
    It does knock at lower rpm butseems to get better at high rpm . I think it's just turning faster and is less noticeable
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  5. Brianmoore25
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    #5 04-24-2018, 03:13 PM
    Check gear oil
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  6. Basscat528
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    #6 04-25-2018, 12:18 PM
    Changed it, had some shavings in but looked ok
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  7. 1Holeshot
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    #7 04-25-2018, 06:30 PM
    I had a 2014 Suzuki DF90 4 stroke that would make a knocking sound in gear below 1200 rpms. Turned out to be the prop/lower unit. Would go away once I reached 1200 rpms. Prop had the pressed in hub. Some of the newer hubs address the problem and do not knock.
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