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  1. #21
    Bob 1tommygunner1927's Avatar
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    Where in the exhaust are you guys installing the O2 sensor? As mentioned in post 2, water/steam will shorten the life of the sensor.
    Last edited by 1tommygunner1927; 03-27-2020 at 11:27 AM.

  2. #22
    ncdoo's Avatar
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    We have the same problem on the Doo's. I think its an inherit problem to a jet ski, due to the fact that water sits in the exhaust at all times. Taking it out after every ride seems to help but eventually they will go bad.

  3. #23
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by ncdoo View Post
    We have the same problem on the Doo's. I think its an inherit problem to a jet ski, due to the fact that water sits in the exhaust at all times. Taking it out after every ride seems to help but eventually they will go bad.

    I agree O2 sensors do not have long lives in PWC's. That said, I usual get about a 1.5 +/- seasons use of the 3 O2 sensors installed in the 1" exhaust spacer at the head. Early last year I added a 4th sensor after the turbo, which is still good.

    In my application, its not water or water vapor/steam (no waterbox) that shortens the life of the sensors, its exhaust pressure and heat! Torco will also shorten their longevity.

  4. #24
    mittens's Avatar
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    hell If I get a season out of one that would be awesome. I am worried about getting the whole day ha

    but so far this one has lived... riding tomorrow so we will see.


  5. #25
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by mittens View Post
    hell If I get a season out of one that would be awesome. I am worried about getting the whole day ha

    but so far this one has lived... riding tomorrow so we will see.
    The other option is to use exhaust gas temperature (EGT) probes at each cylinder.

  6. #26
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    Quote Originally Posted by 1tommygunner1927 View Post
    The other option is to use exhaust gas temperature (EGT) probes at each cylinder.
    I would love to. But how can I log aa that data without a Motec? If there its a way to do it with my Maptuner X that would be awesome.

  7. #27
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by Jkmike View Post
    I would love to. But how can I log aa that data without a Motec? If there its a way to do it with my Maptuner X that would be awesome.

    Logging EGTs is doable with MoTeC. I'm confident an additional channel could be added to Maptuner with enough interest, but currently not available.

  8. #28

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    I happen to have an O2 heat sink bung extender in my shop. Benefit of having and working on drag race cars. You can get them online for around $90. My friend has another laying around his shop. I need to get that one for my other ski.

    This is definitely the way to go and should help the sensors last much longer. Exhaust pressure forces the air into the holes. The sensor in my ski is the second one and I replaced it at the end of last year. I have some logged data that I can use for comparison. Also, Bosch LSU 4.9 is the sensor you want, 4.2 is old technology.

    Robert
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  9. #29
    Here is my factory O2 plug drilled out with bung extender and then 02 sensor.. Would this be too high above and out of the exhaust stream to get accurate readings??
    Without the bung extender the 02 sensor hangs down quite a bit below the end of the plug. Click image for larger version. 

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  10. #30
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    Hook them up the a switch. turn the guage on and let the sensor warm up before starting the ski. When you shut the ski off leave sensor on for a few seconds before turning it off. If you allow water to but the sensor before its warmed up it will kill the them faster. Key is to warm sensor up before starting ski.

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