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  1. #1

    Join Date
    Jul 2019
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    Noobie with a MSX150

    Bought an MSX150, started great on the trailer, everything looked good.
    Got it home, put it in the lake and it wouldn't start. Seemed to flood.
    Pulled it out and started on the trailer again, backed it into the water and it continued running fine.
    Once warmed up, went for a rip and it ran great; 60mph+, 7500rpm, everything seemed great.
    Shut it off and won't restart, makes one attempt on first turn and seems to flood.
    Pull it out of the water and it starts back up.
    Have checked some of the stuff I managed to find here and nothing.
    Would appreciate any tips/advice that those with experience can share.
    Being in Canada parts are very hard to come by so ordering from the states is a long painful process.
    Thanks in advance


  2. #2
    Moderator HiPeRcO's Avatar
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    Welcome to Greenhulk.

    Check compression, hard starting in the water is strongly suggesting low compression.

  3. #3

    Join Date
    Jul 2019
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    I took a look inside the cylinders with my endoscope and other than scuffing from moisture ingestion they don't look bad, couldn't see any nicasil peeling. Pulled the hoses off of both sides of the intercooler and there's oil on the turbo side and water contaminated oil above the throttle body; explains the cylinder scuffing. was thinking of doing a leak down test but wondered if the oil contaminated sensors on the intake tract would be enough to cause the starting issues?

  4. #4
    Moderator HiPeRcO's Avatar
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    A compression test is easy, may I ask why you are resisting doing one?

  5. #5

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    Oct 2011
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    * You need a Leak-down test*

  6. #6
    MPG350's Avatar
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    Next time it struggles in the water...open up you gas cap release the pressure and rock the exhaust out of the water when starting....ive noticed mine might have fuel vent line clog but doing those two things helps mine start when its hot and been out in the sun awhile.

    Mine never has issues starting when cold only a hot engine and in the sun.

    When my map sensors had oil it ran like crap so doubt thats the issue if your going 60+ and 7500 rpm.

    Goodluck

  7. #7

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    A compression test is easy, may I ask why you are resisting doing one?

    Ya, I was hoping it was something else.
    Comp test was below 100psi in both cylinders.
    Guess I have another winter project now...

  8. #8
    Moderator HiPeRcO's Avatar
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    Quote Originally Posted by Gone_Ridin View Post
    A compression test is easy, may I ask why you are resisting doing one?

    Ya, I was hoping it was something else.
    Comp test was below 100psi in both cylinders.
    Guess I have another winter project now...
    Dang, sorry to hear that. There are very knowledgeable members here that can offer advice during your teardown/rebuild. BTW, if you update you profile to include your location then maybe there is a member nearby that could lend a hand.

  9. #9
    Ye Ol Salty Dog's Avatar
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    What were the numbers? How is your battery? Don’t take it apart yet. The compression test has as much to do with gauge accuracy and starter speed as anything else. Where did you get the comp gauge?

    i just picked up a new one from harbor freight, it read 40lbs low. So I exchanged it for another... SAME!

    Quote Originally Posted by Gone_Ridin View Post
    A compression test is easy, may I ask why you are resisting doing one?

    Ya, I was hoping it was something else.
    Comp test was below 100psi in both cylinders.
    Guess I have another winter project now...

  10. #10
    Ye Ol Salty Dog's Avatar
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    Do you smell unburnt fuel when it’s not starting? If so, MPG350 may be correct. It’s common to have clogged fuel tank vents from the ski sitting unused for a long time. If the fuel tank gets pressurized, they tend to flood at startup.

    Also, map sensors wouldn’t cause your issue, HOWEVER, the air temp sensor (built into the map sensor) could be faulty causing a flooding condition at startup. A bad coolant temp sensor could also cause flooding at startup. All of which could be overcome when trailer starting because it’s simply easier to startup when there’s no water drag on the impeller.

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