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There is a rapid clicking sound that seems to originate from around the O2 sensor housing area. It can be heard at idle or very low engine speeds. Is there a check valve in the O2 sensor set up? Perhaps in the sensor joint? It sounds like a metal check valve rattling. The engine is a 2001 200HP OX66.
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there is a small metal moving tube/port, that goes behing the o2 sensor bracketin the cylinder head......you can probably see it if you look at the online parts diagram ......
http://parts.yamaha-motor.com/
.....it moves back n forth with cylinder pressure....if its moving...its not clogged up/carboned up....which is good !!!
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