O2 Sensor cleaning pics

So I tackled the o2 sensor clean out on my 2002 250 ox66 last night. I bought this boat less than a year ago. It has roughly 200 hours on it. The guy I bought it from ran only Yamalube but never ran any ringfree. I couldn't believe how much Carbon build up there was. I had to scrape it out it was stuck so bad inside the o2 sensor holder. And the sniffer tube was just as bad.
I see now why Yamaha recommends the ringfree. Still need to test it out but I think this little bit of maintenance should help alot.
Thanks BBC members!

:eek: That is a whole lot of carbon. I cleaned mine out about a month ago and it was dirty but not even close to that. It made a huge difference on the performance of the boat at take off and idle.

I need to do this very same thing to my motor!! Was it difficult?

not at all, for instructions, check out the sticky at the top of this forum.

super easy.... mine was not too bad.

When i had my Ox-66, i used Quick Silver oil and Seafoam and it kept the sensor alot cleaner and i did not have to clean it much at all in the five years i had the motor.

Mine was just as bad when I cleaned it a year or so ago. I've since quit using yamalube and it's stayed clean.

Here's the sniffer tube. The carbon was so hard I had to drill it out. (sorry so big)

http://img593.imageshack.us/img593/6808/1000083ux.jpg

what would a dirty o2 sensor cause to happen

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Originally Posted by 1999skeeterzx202

what would a dirty o2 sensor cause to happen

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Plain and simple, motor would run like crap!, sput and spidder like a plug wire was loose.

Mine sounds like it's sneezing and loading up. Could that be the problem?

I had to drill the tube too. I am definately changing oil after I saw mine. Most likely switch to a synthetic or synth blend.

Quote:

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Originally Posted by 1999skeeterzx202

Mine sounds like it's sneezing and loading up. Could that be the problem?

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Possibly lean condition, clean O2 sensor, also may need synch and link then TPS adjustment.