1999 Yamaha 200HP high speed miss

[peanselmo]

at cruise RPM (3000-3500) I have a slight miss in the firing of the engine. I changed plugs but the problem the same. This is the OX66 efi model. Someone indicated it might be the oxygen sensor. If it is, how can I remedy? Thanks

 

[rogie 80]

Re: 1999 Yamaha 200HP high speed miss

try changing the fuel filter/water separator especially if it is in salt water

 

[rodbolt]

Re: 1999 Yamaha 200HP high speed miss

the O2 sensor is easily tested with a DVM, the correct adapter harness and a service manual supplemented with the 3 tech bullitens.