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Hi, All. I have an early model Yamaha Waverunner, runs fine out of water but breaks down in water under load. one plug oils up. I was going to replace leads but they go into a box. Im not sure if i should go in there, can anyone give me advice please. Cheers BrianK
 

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Sounds typical of a worn out engine. That cylinder that is oiling up is probably kaput. Do a compression test.
 
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