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  1. #21
    DrChuck's Avatar
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    Yes I did swap spark plug wires with no success.

  2. #22
    martincom's Avatar
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    You can swap an injector from one cylinder to the other for a brief test run.

    After that, you're down to the EMM, in my opinion. Lakeside Tech will perform an analyst of of your EMM for a nominal fee & return shipping. That would be your next step unless you know where you can access another MSX140 EMM to test with.

  3. #23
    DrChuck's Avatar
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    I have swapped injectors and the ski ran terrible. Put the injectors back in the correct location and ski ran great until warmed up.

    Spoke with Lakeside. He thinks I have a fuel issue. Recommended testing the fuel pressure while running the ski in the water while it is having the issue. I have connected the fuel pressure gage on land and played with the throttle and the pressure was good. So testing it again this weekend.

  4. #24
    DrChuck's Avatar
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    took the ski on the lake tonight. A little brisk but bearable. Even went for a swim. Probably the last swim for New England weather.
    Pressure started at 28psi and under full throttle 25psi. Jet ski ran perfect until engine warmed up then started to misfire as usual. While the engine misfired fuel pressure held right at 25 psi.

    Suggestions???

  5. #25
    Moderator HiPeRcO's Avatar
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    I wonder if you could be getting water in the PTO cylinder.

    Does the voltage on the white/red wire stay near 45V when the issue is occurring? (The diagnostic plug is a decent place to tap into).


  6. #26
    DrChuck's Avatar
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    I have checked the red white wire and got 45v on land. Have not checked when the problem is happening.
    Removed the PTO plug and it does look wet. Didn't have a strong gas smell. I'm wondering if your "wonder if you could be getting water in the PTO cylinder." theory might be correct.
    If I have an head gasket issue it would make sense about it warming up and then with the extra pressured water thrust going thru the cooling system on higher rpm it might be enough pressure to squirt water into the cylinder. Could explain why it doesn't happen on land. hmmm

    After seeing the spark plug pictures what are your thoughts?




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  7. #27
    Click avatar for tech links/info K447's Avatar
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    Can you remove the Ficht fuel injector and see the piston dome? Maybe use a borescope camera? Or just remove the cylinder head.

    Water in the combustion chamber sometimes 'steam cleans' the piston top, so it has a cleaned metal look rather than the usual thin black carbon coating.

  8. #28
    DrChuck's Avatar
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    Hello I've found the smoking gun.

    PTO cylinder has a head gasket leak. Stuck a borescope in the spark plug hole. As you can see the clean cylinders are #1 & middle. The PTO cylinder has water and oil mixed together in the cylinder to make a soupy mess. Going to rebuild the top end. Didn't see any water in the bottom of the motor.
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