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My yamaha 25hp 99 model 2 stroke outboard started making a clicking sound

Started making the clicking sound while I was cruising along in the water. Lost almost all power and had to drive to the boat ramp at a very slow pace as that's all it could do. Suspect lower unit damage?? Any help with identifying it and is it hard to remove and inspect damage. Photo is not my outboard as I am not at home writing this

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Do compression test if it lost power,sounds like crank bearings.if ok check gearbox oil for metal filings,gearboxes normally don't make funny noises

Posted on May 15, 2014

  • andrew macdonld May 23, 2014

    Did compression test. Too cylinder 135psi bottom cylinder 35psi. Is it hard to check the crank bearings or check the pistons or rings?

  • andrew macdonld May 23, 2014

    Did compression test. Too cylinder 135psi bottom cylinder 35psi. Is it hard to check the crank bearings or check the pistons or rings?

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What condition are the plug wires in ? i would run it with the cover off and see if you are losing spark from a plug wires or coil sometimes when the coil breaks down or the plug wires you might hear a clicking sound when it sparks . just a thought?

Posted on Jun 06, 2014

  • andrew macdonld Jun 07, 2014

    I'll try but the plugs appear to be fine. No compression is the big issue. Hoping it may be a reed valve or somethibg

  • andrew macdonld Jun 07, 2014

    I'll try but the plugs appear to be fine. No compression is the big issue. Hoping it may be a reed valve or somethibg

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