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200 Yamaha OX66 "ticking" noise?

Old 06-26-2011, 05:39 PM
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Default 200 Yamaha OX66 "ticking" noise?

I have a 1999 200 OX66. Noticed that I have a "ticking" noise at idle and as well as fast idle. Motor is not knocking and runs great. It does "stumble" or "shutter" just a tad for just a second when coming up on plain. The ticking comes and goes but mainly does it below 1200 rpm's.

Was just wondering if anyone has experienced this or know what it might be. Thanks!
Old 06-26-2011, 06:02 PM
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I had the same thing happening to my year 2000, 200 ox66. I only noticed the ticking at idle backing into my slip. Then I has some acelleration problems. Mechanic replaced the O2 sensor and VST filter and it was back to normal and running fine.
5th
Old 06-27-2011, 05:52 AM
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Thanks 5th Tuition. For some reason this thread double posted. Don't think it is a wrist pin or rings as others have suggested. It comes and goes and the motor runs strong and the compression is good. It does "shutter" a little when accelerating. The ticking is just at idle or very low speed.

Do I need to replace the o2 sensor or can I remove it and clean it? I don't have a manual for this motor which I need to get. How do I remove the VST filter? Thanks!
Old 06-27-2011, 06:00 AM
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Yes, the ticking is the O2 sensors port tube going back and forth in it's pocket. Make sure you have the upgraded port tube, and clean the sensor and the VST.
Old 06-27-2011, 06:57 AM
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Thanks guys! What do I need to clean the o2 sensor with? Is this tube easy to remove?
Old 06-27-2011, 07:03 AM
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Some people have success cleaning the O2 sensor. My mechanic cleaned mine and it didn't take care of the problem. We replaced it and all was fine. As for the VST filter, you can do a search on THT and there are photo's to take you through the whole proceedure.
Yamaha recommends you replace the O2 sensor and VST filter somewhere around 300 hours (someone correct me if I'm wrong). My motor probably had twice that on it when I noticed the trouble. I asked my mechanic why we didn't replace at the recommended hours and he said you dodn't need to. Just run the engine until you notice a problem and change it then.
Best of luck, 5th
Old 06-27-2011, 07:11 AM
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Originally Posted by 5th Tuition View Post
Just run the engine until you notice a problem and change it then.
Best of luck, 5th
This is not good advice. Yamaha recommends cleaning, inspecting and checking the output voltage from the O2 sensor every 200 hours or year, whichever comes first.

Running the motor above 4000 rpms with a bad O2 sensor will run lean.
Old 06-27-2011, 07:26 AM
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The ticking is most likely from the metal tube being gunked up and knocking back and forth. Easy to clean out, use a screwdriver to chip away at the carbon on the outside of the barbell shaped tube, and use drill bits BY HAND of increasing sizes to clean the middle of the tube.

To clean carbon off the sensor itself, soak the very tip in ringfree for a while, then carefully scrape away the carbon.

-- Tom
Old 06-27-2011, 07:56 AM
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Originally Posted by stripertom View Post
The ticking is most likely from the metal tube being gunked up and knocking back and forth. Easy to clean out, use a screwdriver to chip away at the carbon on the outside of the barbell shaped tube, and use drill bits BY HAND of increasing sizes to clean the middle of the tube.

To clean carbon off the sensor itself, soak the very tip in ringfree for a while, then carefully scrape away the carbon.

-- Tom
Thanks for the detailed instructions. Not sure about the history of the o2 sensor whether it has been replaced or not. Do I need to install a new one or clean it as you suggested?
Old 06-27-2011, 08:08 AM
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Originally Posted by jdupree View Post
Thanks for the detailed instructions. Not sure about the history of the o2 sensor whether it has been replaced or not. Do I need to install a new one or clean it as you suggested?
Do a price check...You'll be cleaning it first.
Old 06-27-2011, 08:12 AM
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Originally Posted by debugger View Post
Do a price check...You'll be cleaning it first.
Yea, apparently these are made from 24kt gold and the price column says ''Market Price''!
Old 06-28-2011, 08:16 AM
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Originally Posted by stripertom View Post
The ticking is most likely from the metal tube being gunked up and knocking back and forth. Easy to clean out, use a screwdriver to chip away at the carbon on the outside of the barbell shaped tube, and use drill bits BY HAND of increasing sizes to clean the middle of the tube.

To clean carbon off the sensor itself, soak the very tip in ringfree for a while, then carefully scrape away the carbon.

-- Tom
Is threre any way someone could post a picture of the metal tube that needs to be cleaned? Don't have a manual yet but going to get one. Thanks.
Old 06-28-2011, 08:38 AM
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You can't miss it, when you un-bolt the O2 sensor cover it will be going into the engine block. It isn't attached to anything and just rides in the opening between the sensor and the top cylinder wall. Its about 1.25" long, 1/4" wide.

-- Tom
Old 06-28-2011, 09:28 AM
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dogbone. A 1/8" drill bit fits perfectly inside to clean it.
Old 06-28-2011, 09:37 AM
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Originally Posted by stripertom View Post
You can't miss it, when you un-bolt the O2 sensor cover it will be going into the engine block. It isn't attached to anything and just rides in the opening between the sensor and the top cylinder wall. Its about 1.25" long, 1/4" wide.

-- Tom
Will I need to remove the o2 sensor as well? Should I put any kind of cleaner on the drill bit?
Old 06-30-2011, 05:37 AM
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Ok, got the O2 sensor and the sniffer tube (looks like a barbell) pulled last night. Sniffer tube was completely clogged up! Took about 15 minutes to clear the hole and get it clean.

As far as the O2 sensor goes. It was gummed up as well. Could not even see the holes on the sensor itself. I am surprised the motor runs as good as it does. Hopefully the ticking will be gone as well. Did notice the ticking was coming from the O2 sensor area so I hope this will do the trick.

Plan to run the motor this weekend and I will post a report. Hopefully if this eliminates the ticking noise and this thread along with others, will help someone in the future.

Just a side note. I have only owned the boat for about six months so not sure if the O2 sensor has ever been cleaned/replaced. I would guess that it has not.
Old 06-30-2011, 05:57 AM
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Default stator

Could be the stator grounding out on block,
Old 07-02-2011, 04:42 PM
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Ok, ticking noise is gone. Keep in mind motor ran good before I removed the O2 sensor. Just had the "ticking" and would stumble just the slightest bit coming on plane.

Dropped it in today. Motor will barely stay running and will idle at 300rpms. Don't see how I could done anything wrong putting the O2 sensor back in. Act's like it is not getting enough gas and I am smelling raw fuel. Coming up on plane feels like I could be loosing a cylinder but the motor does run good on plane.

Any suggestions would be great at this point. Thanks!
Old 03-31-2016, 08:56 AM
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I have somewhat of a similar problem with a 2000 yamaha 225 salt water series 2 ox66. Except mine only ticks/rattles between 3000/4000 rpm as it climbs to a plane. ??? Anyone else have this problem.?
Old 03-31-2016, 12:47 PM
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Try the above suggestions and clean/replace your o2 sensor.

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