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    Rubber debris in cooling system

    I have found black rubber debris in the cooling system (foot) of my Yamaha 50 hp motor. It is not the impeller but must come from another source. I have cleaned it out 2 times but it continues to appear causing the engine to overheat. Any ideas of the source of these rubber particles?
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    Remove lower unit to replace impeller.

    Please give me detailed instructions on removing the lower unit (foot) to replace impeller on my 1990 Yamaha 30HP, Model 305G.
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