SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Dec 2008
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    Angry Tech Support help with lean condition

    Recently installed 2nd SBT 1200PV engine, new reeds and plugs in my Y2K GP1200R. Previous SBT engine failed due to rear cylinder burn out. After 2-3 hours of break-in riding I pulled the plugs and now the front cylinder is showing a lean condition. Was very careful to install the intake manifold and carb
    assembly following OEM recommendations for torque and tightening order so I don't suspect an intake leak. On the previous engine, the plugs were showing front cylinder rich, middle perfect, rear lean. What do you recommend?

  2. #2
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    Default Re: Tech Support help with lean condition

    Does it have the cat installed? Had the carbs been rebuilt and what did you set the pop-off psi to?
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  3. #3
    Joined
    Dec 2008
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    Default Re: Tech Support help with lean condition

    Quote Originally Posted by Technical Support View Post
    Does it have the cat installed? Had the carbs been rebuilt and what did you set the pop-off psi to?
    No cat, RIVA DPlate + Chip and freeflow exhaust, stock airbox. Carbs were rebuilt when I installed the previous SBT engine. I did not measure pop-off as I
    didn't have the proper tools. Curious how I can go from the previous condition of front=rich, middle=perfect, rear=lean to front=lean, middle and
    rear look OK. I did not rebuild the carbs again. All that has changed is the engine. Thanks.

  4. #4
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    Dec 2008
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    34

    Default Re: Tech Support help with lean condition

    Quote Originally Posted by SMLAKER View Post
    No cat, RIVA DPlate + Chip and freeflow exhaust, stock airbox. Carbs were rebuilt when I installed the previous SBT engine. I did not measure pop-off as I
    didn't have the proper tools. Curious how I can go from the previous condition of front=rich, middle=perfect, rear=lean to front=lean, middle and
    rear look OK. I did not rebuild the carbs again. All that has changed is the engine. Thanks.
    AND a new set of reeds from SBT.

  5. #5
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    Default Re: Tech Support help with lean condition

    Go back through the carbs and check pop-off too. 65 psi is what you want.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

  6. #6
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    Dec 2008
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    Default Re: Tech Support help with lean condition

    Will do. However, I have the RIVA D-Plate & chip. I plan to remove the stock air box and install RIVA FAs/socks/splashguard. I will be looking for a PO around 50-55 to keep it a little richer.

  7. #7
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    Default Re: Tech Support help with lean condition

    Correct, lower pop-off for aftermarket filters
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

  8. #8
    Joined
    Dec 2008
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    34

    Default Re: Tech Support help with lean condition

    After the mods, I also plan to disable the accelerator pump as that will add too much fuel to 1&3

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