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    2004 Yamaha 15hp outboard motor thumping/ knocking

    I’m New to the forum here and looking for some advice/ help. I have a 2004 Yamaha 15 hp 4 stroke on my 15 foot jon boat. While on the lake the other day the motor started to make a thump/ knocking sound only at full throttle. The sound does not appear until I hit full throttle or just below full...
  2. B

    Yamaha 2004 15hp outboard 4 stroke knocking/ thumping

    I’m New to the forum here and looking for some advice/ help. I have a 2004 Yamaha 15 hp 4 stroke on my 15 foot jon boat. While on the lake the other day the motor started to make a thump/ knocking sound only at full throttle. The sound does not appear until I hit full throttle or just below full...
  3. B

    Yamaha 15 hp 4 stroke knocking/ thump sound

    I’m New to the forum here and looking for some advice/ help. I have a 2004 Yamaha 15 hp 4 stroke on my 15 foot jon boat. While on the lake the other day the motor started to make a thump/ knocking sound only at full throttle. The sound does not appear until I hit full throttle or just below full...
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