[brian kneebone]

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

 

[Ernest T]

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

 

[JUST-IN-TIME]

check for spark also